Effects of deep cryogenic treatment on the residual stress and mechanical properties of electron-beam-welded Ti–6Al–4V joints

Xu, Lianyong; Zhu, Jingdong; Jing, Hongyang; Zhao, Lei; Lv, Xiaoqing; Han, Yongdian

doi:10.1016/j.msea.2016.07.101

Cited by 58 publications

(15 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is most likely that the change in the density and size of the coarse secondary phase was induced by the dissolution of alloy elements from the coarse secondary phase into the α(Al) matrix. According to the research of Xu et al, the dislocation was induced by high stress, due to structural shrinkage and the different expansion coefficients of the different phases during the process of CT [20]. There is an obvious distinction between the thermal expansion coefficients of the α(Al) matrix and coarse precipitates.…”

Section: Sample Solution Treatment Cryogenic Treatmentmentioning

confidence: 99%

Effects of Cryogenic Treatment on the Microstructure and Residual Stress of 7075 Aluminum Alloy

Wei

Wang

et al. 2018

Metals

View full text Add to dashboard Cite

The effect of cryogenic treatment (CT) on the microstructure, residual stress, and dimensional stability of 7075 aluminum alloy under temperatures of 0 • C, −60 • C, −120 • C, and −196 • C were studied, using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), an X-ray diffractometer, and an X-ray stress tester. The results indicated that CT can facilitate the dissolution of the coarse secondary phase into the α(Al) matrix, promote uniform distribution of Mg, Cu, Zn elements, and increase the density of fine secondary phases in the 7075 Al alloy. The CT can also induce the rotation of the α(Al) grain towards (200), through the processes of recovery and recrystallization. It was found that the residual stress was released, and a higher dimensional stability of the 7075 aluminum alloy was achieved, after CT. Experimental results demonstrated that the optimum CT temperature for the 7075 aluminum alloy is −120 • C.

show abstract

Section: Sample Solution Treatment Cryogenic Treatmentmentioning

confidence: 99%

Effects of Cryogenic Treatment on the Microstructure and Residual Stress of 7075 Aluminum Alloy

Wei

Wang

et al. 2018

Metals

View full text Add to dashboard Cite

show abstract

“…Lately, cryogenic treatment has been applied to different alloys like magnesium [19,20] and high vanadium alloy steel to improve their mechanical properties [21], or to different welded joints to reduce the residual stresses [22] and improve the tensile properties of the joints [23]. The application of DCT for the improvement of the corrosion resistance of different alloys has also been investigated.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cryogenic Treatment on Wear Resistance and Microstructure of AISI A8 Tool Steel

Jimbert¹,

Iturrondobeitia²,

Ibarretxe³

et al. 2018

Metals

View full text Add to dashboard Cite

The effects of deep cryogenic treatment (DCT) on the wear behavior of different tool steels have been widely reported in the scientific literature with uneven results. Some tool steels show a significant improvement in their wear resistance when they have been cryogenically treated while others exhibit no relevant amelioration or even a reduction in their wear resistance. In this study, the influence of DCT was investigated for a grade that has been barely studied in the scientific literature, the AISI A8 air-hardening medium-alloy cold work tool steel. Several aspects were analyzed in the present work: the wear resistance of the alloy, the internal residual stress, and finally the secondary carbide precipitation in terms of lengths and occupied area and its distribution into the microstructure. The results revealed a reduction in the wear rate of about 14% when the AISI A8 was cryogenically treated before tempering. The number of carbides that precipitated into the microstructure was 6% higher for the cryogenically treated samples, increasing from 0.68% to 0.73% of the total area they covered. Furthermore, the distribution of the carbides into the microstructure was more homogenous for the cryogenically treated samples. Author Contributions: Methodology, P.J.; Investigation, P.J.; Project administration, P.J.; Writing-original draft, P.J.; Software, M.I.; Data curation, M.I. and J.I.; Validation, R.F.-M.; Writing-review and editing, R.F.-M. and J.I.

show abstract

“…In the two phases of Ti-6Al-4V alloy, the microhardness of the α phase is higher than that of the β phase. Moreover, the compressive stress during cooling leads to the increase of dislocation density and a more stable lattice structure, which results in the increase of microhardness of the specimens after cryogenic treatment [45,46].…”

Section: Resultsmentioning

confidence: 99%

“…If the contact stress is high and exceeds a 1/3 of the hardness of the material, adhesive wear will easily occur. In addition, cryogenic treatment results in more dislocations in titanium alloy samples [42,45], which improves the resistance to micro-plastic deformation. These factors together lead to slighter adhesion wear of CT Ti alloy samples.…”

Section: Resultsmentioning

confidence: 99%

Investigation on Wear Behavior of Cryogenically Treated Ti-6Al-4V Titanium Alloy under Dry and Wet Conditions

Wang

Yang

et al. 2019

Materials

View full text Add to dashboard Cite

Titanium alloys are widely used in many fields because of their excellent comprehensive properties. However, its poor friction and wear properties limit its many potential applications. In general, the surface roughness of important parts manufactured by titanium alloy should meet certain requirements. As a low-cost and high-efficiency processing method, barrel finishing has been used for the surface finishing of titanium alloys. The main material removal mechanism of barrel finishing is micro-cutting/grinding, which is similar to the material wear mechanism under some conditions. In addition, titanium alloys are subjected to a low force in common surface finishing processes. Cryogenic treatment is a method that can improve the comprehensive properties of titanium alloys. Therefore, the friction and wear behavior of cryogenically treated Ti-6Al-4V titanium alloy (CT Ti alloy) and non-cryogenically treated Ti-6Al-4V titanium alloy (NT Ti alloy) at a low load and scratch speed was studied comparatively in this paper. The results show that the CT Ti alloy exhibits a lower friction coefficient and wear rate under both dry and wet wear conditions. Under wet conditions, the stabilized friction coefficient is lower than that under dry conditions. The stabilized friction coefficient of CT Ti alloy is 0.18 after reaching a stable wear stage under wet conditions. Under dry wear conditions, the NT Ti alloy mainly showed typical abrasive wear, heavy adhesion wear and oxidation wear characters. The wear mechanisms of CT Ti alloy are mainly abrasive wear, slight adhesion wear and oxidation wear. Under wet wear conditions, the wear mechanism of NT Ti alloy is abrasive wear and slight adhesion wear. After cryogenic treatment, the mechanism for CT Ti alloy is slight abrasive wear.

show abstract

Effects of deep cryogenic treatment on the residual stress and mechanical properties of electron-beam-welded Ti–6Al–4V joints

Cited by 58 publications

References 47 publications

Effects of Cryogenic Treatment on the Microstructure and Residual Stress of 7075 Aluminum Alloy

Effects of Cryogenic Treatment on the Microstructure and Residual Stress of 7075 Aluminum Alloy

Influence of Cryogenic Treatment on Wear Resistance and Microstructure of AISI A8 Tool Steel

Investigation on Wear Behavior of Cryogenically Treated Ti-6Al-4V Titanium Alloy under Dry and Wet Conditions

Contact Info

Product

Resources

About