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1 – 10 of 506
Article
Publication date: 29 August 2019

G. Yoganjaneyulu, V.V. Ravikumar and C. Sathiya Narayanan

The purpose of this paper is to investigate the strain distribution, stress-based fracture limit and corrosion behaviour of titanium Grade 2 sheets during single point incremental…

Abstract

Purpose

The purpose of this paper is to investigate the strain distribution, stress-based fracture limit and corrosion behaviour of titanium Grade 2 sheets during single point incremental forming (SPIF) process, with various computerized numerical control (CNC) spindle rotational speeds and step depths. The development of corrosion pits in 3.5 (%) NaCl solution has also been studied during the SPIF process.

Design/methodology/approach

A potentiodynamic polarization (PDP) study was performed to investigate the corrosion behaviour of titanium Grade 2 deformed samples, with various spindle rotational speeds in 3.5 (%) NaCl solution. The scanning electron microscope (SEM) and transmission electron microscope (TEM) analysis was carried out to study the fracture behaviour, dislocation densities and corrosion morphology of deformed samples.

Findings

The titanium Grade 2 sheets exhibited better strain distribution, fracture limit and corrosion resistance by increasing the CNC spindle rotational speeds, tool diameters and vertical step depths (VSD). It was recorded that varying the spindle speed affected plastic deformation which in turn affected corrosion rate.

Research limitations/implications

In this study, poor corrosion rate was observed for the as-received condition, and better corrosion rate was achieved at maximum speed of 600 rpm and 0.6 mm of VSD in the deformed sheet. This indicates that corrosion rate improved with increase in the plastic deformation. The EDS analysis report of corroded surface revealed the composition to be mainly of titanium and oxides.

Practical implications

This study discusses the strain distribution, stress-based fracture limit and corrosion behaviour by using titanium Grade 2 sheets during SPIF process.

Social implications

This study is useful in the field of automobile and industrial applications.

Originality/value

With an increase in the spindle rotational speeds and VSD, the titanium Grade 2 sheets showed better strain distribution, fracture limit and corrosion behaviour; the same is evidenced in fracture limit curve and PDP curves.

Article
Publication date: 20 August 2019

G. Yoganjaneyulu, Y. Phaneendra, V.V. Ravikumar and C. Sathiya Narayanan

The purpose of this paper is to investigate the void coalescence and corrosion behaviour of titanium Grade 4 sheets during single point incremental forming (SPIF) process with…

Abstract

Purpose

The purpose of this paper is to investigate the void coalescence and corrosion behaviour of titanium Grade 4 sheets during single point incremental forming (SPIF) process with various spindle rotational speeds. The development of corrosion pits in 3.5 (%) NaCl solution has also been studied during SPIF process.

Design/methodology/approach

In this current research work, the void coalescence analysis and corrosion behaviour of titanium Grade 4 specimens were studied. A potentio-dynamic polarization (PDP) study was conducted to investigate the corrosion behaviour of titanium Grade 4 processed samples with various spindle speeds in 3.5 (%) NaCl solution. The scanning electron microscope and transmission electron microscope analysis was carried out to study the fracture behaviour and corrosion morphology of processed samples.

Findings

The titanium Grade 4 sheets obtained better formability and corrosion resistance by increasing the CNC spindle rotational speeds. In fact that, the significant plastic deformation affects the corrosion rate with various spindle speeds were recorded.

Originality/value

The spindle rotational speeds and vertical step depths increases then the titanium Grade 4 sheets showed better formability, void coalescence and corrosion behaviour as the same is evidenced in forming limit diagram and PDP curves.

Details

Anti-Corrosion Methods and Materials, vol. 66 no. 6
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 19 May 2022

Shaik Heruthunnisa and Chandra Mohana Reddy B.

The purpose of this paper is to study formability, tensile properties, dislocation density and surface roughness of incrementally deformed Ti–6Al–4V alloy sheets during…

Abstract

Purpose

The purpose of this paper is to study formability, tensile properties, dislocation density and surface roughness of incrementally deformed Ti–6Al–4V alloy sheets during single-point incremental forming (SPIF) and multi-point incremental forming (MPIF) process. The development of corrosion pits in 3.5% NaCl solution has also been studied during SPIF and MPIF processes.

Design/methodology/approach

In this study, the formability, tensile properties, dislocation density, surface roughness and corrosion behaviour of deformed Ti–6Al–4V alloy sheets were studied. A potentio-dynamic polarization (PDP) study was conducted to study the corrosion behaviour of Ti–6Al–4V alloy samples during SPIF and MPIF processes and the results were also compared with base material (BM) in 3.5% NaCl solution. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses were carried out to study the corrosion morphology and dislocation densities of deformed samples.

Findings

The deformed Ti–6Al–4V alloy sheets obtained higher plastic deformation, high tensile strength, good surface roughness and good corrosion resistance during MPIF process when compared with SPIF process.

Research limitations/implications

It has been concluded that the maximum strain and good corrosion resistance have been achieved with MPIF process, which in turn increases the plastic deformation as compared with BM.

Practical implications

This study discussed the formability, tensile properties, surface roughness and corrosion behaviour of deformed Ti–6Al –4V alloy sheets during incremental sheet forming (ISF) process.

Social implications

This study is useful in the field of medical, industrial and automobile applications.

Originality/value

The Ti–6Al–4V alloy is deformed using MPIF process, achieving better formability, tensile strength, good surface roughness and corrosion rate, and the same is evidenced in forming limit diagrams (FLDs) and PDP curves.

Details

Anti-Corrosion Methods and Materials, vol. 69 no. 4
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 26 July 2021

Zhong Li, Xiaojia Yang, Jing Liu, Zhiyong Liu, Xiaogang Li and Yan Tingting

The purpose of this paper is to determine the failure reasons and failure mechanism of the commercially pure titanium air conditioning condenser.

Abstract

Purpose

The purpose of this paper is to determine the failure reasons and failure mechanism of the commercially pure titanium air conditioning condenser.

Design/methodology/approach

In this paper, chemical analysis, metallographic observation, visual examination and scanning electron microscope examination, corrosion products analysis and working conditions analysis were adopted for determining the reasons for the failure of the condenser.

Findings

The results indicated that TA2 titanium pipe perforation failure is caused by the synergistic effect of crevice corrosion and deposit corrosion. The corrosion processes can be divided into three steps.

Originality/value

This research is an originality study on the failure case of a commercially pure titanium air conditioning condenser. This study makes up for the shortage of titanium alloy failure cases and also gives the result of the failure reason and failure mechanism for titanium, which has an engineering significance.

Details

Anti-Corrosion Methods and Materials, vol. 68 no. 4
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 1 April 1957

TITANIUM is a new metal but not a rare one. It is new in the sense that although its existence has been known since 1791, it is only within the last decade that it has become a…

Abstract

TITANIUM is a new metal but not a rare one. It is new in the sense that although its existence has been known since 1791, it is only within the last decade that it has become a product of metallurgical industry. It was not until 1925 that it was made by van Arkel, on a small experimental scale, in a state of sufficient purity for an assessment to be made of its properties and of its potential value as an engineering material. So far, it has not been possible to translate into a large scale and economically attractive extraction process the van Arkel technique and it was, in fact, left to W. J. Kroll to devise the first industrial process for the production of ductile titanium, which he described in 1940.

Details

Aircraft Engineering and Aerospace Technology, vol. 29 no. 4
Type: Research Article
ISSN: 0002-2667

Article
Publication date: 1 February 1996

Houssni El‐Saied, Snaa M. El‐Sawy and Altaf H. Basta

Reports on tests in which barium metaborate pigment and its modified form are prepared, identified by chemical and X‐ray diffraction methods, and specified according to standard…

Abstract

Reports on tests in which barium metaborate pigment and its modified form are prepared, identified by chemical and X‐ray diffraction methods, and specified according to standard methods. Evaluates the modified barium metaborate as a new filler for paper making by carrying out two series of experiments. Details the results which showed that the efficiency of the filler retention when using modified barium metaborate was higher than that of the other two conventional fillers. Reveals that at relatively low filler addition (2–5 percentage weight), higher improvement in the strength properties can be obtained when using the modified pigment instead of titanium dioxide and kaolin, but observes the reverse (i.e. a detrimental effect) at relatively high filler addition (8–10 percentage weight). Discovers that the optical properties of the modified pigment‐loaded sheets lie between those of titanium dioxide and kaolin. Shows that blending barium metaborate with kaolin or titanium dioxide has a significant effect on strength properties rather than optical properties. Concludes that modified barium metaborate pigment can be successfully used in paper filling applications and that modified barium metaborate pigment‐kaolin blend (80/20 per cent) can be used instead of titanium dioxide as a paper filler.

Details

Pigment & Resin Technology, vol. 25 no. 2
Type: Research Article
ISSN: 0369-9420

Keywords

Article
Publication date: 1 November 1981

M. El‐Sherbiny and F. Salem

It is now increasingly recognised that surface coating technology offers production engineers and designers significant opportunities to optimise the use of raw materials. Due to…

Abstract

It is now increasingly recognised that surface coating technology offers production engineers and designers significant opportunities to optimise the use of raw materials. Due to the forecasted shortage in a number of engineering metals, such as zinc, mercury, tin … etc., surface coating technology offers the most attractive finishing process, with material conservations. Suitable bulk materials may be selected for cost or structural reasons, whilst surface coating materials are chosen to meet specific surface properties, such as wear resistance, protection against corrosion, surface thermal and electrical conductance, optical reflections and decorative features. The recent design trends towards higher speeds, minimum airplane weight and maximum load capacity, however, encourage the use of light weight titanium fasteners in airplane aluminium alloy structures. This creates a serious galvanic corrosion problem to airplane skin sheets. In the following a new surface coating technique which is recently recognised as a growth of a new technology is applied to the problem of galvanic corrosion in air frame structures. The application of aluminium coatings for the protection of airplane skin sheets and fasteners against the galvanic corrosion in local environments is investigated. Both polarisation and galvanic tests are used for the evaluation of the potential of the new surface coatings. Furthermore both sodium chloride and sulphur dioxide electrolytes are used to simulate sea water and jet exhaust environments. Electrolyte saturation with either air or nitrogen are considered to compensate for the presence and lack of oxygen at different environments. It is concluded that the strong adhesion and the extensive graded interfaces of the ion plated films are responsible for the good protection of coated metallic couples.

Details

Anti-Corrosion Methods and Materials, vol. 28 no. 11
Type: Research Article
ISSN: 0003-5599

Article
Publication date: 1 November 1968

D.C. Moore

FEW materials have made such an impact on the engineering scene as have titanium and its alloys. Whilst titanium was first isolated in 1825 it was not at that time recognised as…

Abstract

FEW materials have made such an impact on the engineering scene as have titanium and its alloys. Whilst titanium was first isolated in 1825 it was not at that time recognised as having very desirable properties and no convenient method of extraction was found until 1940. Since then no efforts have been spared in developing the metal and its alloys, rapid progress having been made as reflected by the fact that titanium is now available in wide variety. Its high strength to weight ratio, especially when alloyed, offers considerable attractions to the aircraft industry, and in this field manufacturers have not been slow in taking advantage of the increased pay loads to be gained by using titanium and its alloys in place of more dense materials. Probably the largest single factor in enabling full exploitation is the case with which titanium can be joined by a number of processes and techniques, a brief review of which is given in the present paper. The costs of using the various processes arc not considered in this review, but nonetheless, it is noteworthy that economic aspects as well as technical requirements continue to stimulate further development.

Details

Aircraft Engineering and Aerospace Technology, vol. 40 no. 11
Type: Research Article
ISSN: 0002-2667

Article
Publication date: 30 August 2022

Bo Chen, Tao Wang, Xin Xi, Caiwang Tan and Xiaoguo Song

Ti-Al composite plates have been used in aerospace and other important fields for specific purposes in recent years. However, relatively few studies have concentrated on Ti-Al…

Abstract

Purpose

Ti-Al composite plates have been used in aerospace and other important fields for specific purposes in recent years. However, relatively few studies have concentrated on Ti-Al additive manufacturing because during additive manufacturing process the local fusion and mixing of Ti/Al are inevitable. These areas where Ti and Al are mixed locally, especially interface, could easily generate high residual stresses and cracks. This study aims to manufacture Ti-Al functionally graded material and investigate the interaction of interface.

Design/methodology/approach

In this study, Ti6Al4V/AlSi10Mg functionally graded materials were fabricated by laser based directed energy deposition (L-DED) and a strategy using V interlayer to relieve interfacial stress was investigated.

Findings

The area between the two materials was divided into transition zone (TZ) and remelting zone (RZ). The phase distribution, microstructure and micro-Vickers hardness of the TZ and RZ were investigated. Typical intermetallic compounds (IMCs) such as TiAl3, Ti3Al and Ti5Si3 were found in both composites. The addition of V interlayer promoted the homogenization of IMCs near interface and led to the formation of new phases like V5Si3 and Al3V.

Originality/value

The solidification process near the interface of Ti-Al functionally graded material and the possible generation of different phases were described. The result of this paper proved the feasibility of manufacturing Ti-Al functionally graded material by L-DED.

Details

Rapid Prototyping Journal, vol. 29 no. 3
Type: Research Article
ISSN: 1355-2546

Keywords

Article
Publication date: 1 August 1998

Jaroslav Mackerle

This paper gives a review of the finite element techniques (FE) applied in the area of material processing. The latest trends in metal forming, non‐metal forming, powder…

4528

Abstract

This paper gives a review of the finite element techniques (FE) applied in the area of material processing. The latest trends in metal forming, non‐metal forming, powder metallurgy and composite material processing are briefly discussed. The range of applications of finite elements on these subjects is extremely wide and cannot be presented in a single paper; therefore the aim of the paper is to give FE researchers/users only an encyclopaedic view of the different possibilities that exist today in the various fields mentioned above. An appendix included at the end of the paper presents a bibliography on finite element applications in material processing for 1994‐1996, where 1,370 references are listed. This bibliography is an updating of the paper written by Brannberg and Mackerle which has been published in Engineering Computations, Vol. 11 No. 5, 1994, pp. 413‐55.

Details

Engineering Computations, vol. 15 no. 5
Type: Research Article
ISSN: 0264-4401

Keywords

1 – 10 of 506