Effect of Deformation on the Microstructure of Cold-Rolled TA2 Alloy after Low-Temperature Nitriding

Abstract

In order to improve the low hardness and poor wear resistance of TA2, this paper proposes a composite process of cold-rolling and low-temperature plasma nitriding with recrystallization. This composite modification process can effectively achieve the dual goals of modifying the matrix structure and surface of TA2 alloy simultaneously. The cold-rolling experimental results indicate that when the deformation rate increases, the small-sized grains in the sample increase significantly, and the grain orientation changes from TD (transverse direction) to RD (rolling direction) and then to TD. The nitriding experimental results indicate that the {0001} basal surface texture deflected from the TD direction to the RD direction, {10-10} cylindrical texture components gradually increased, and the special orientation phenomenon of cylindrical and conical texture disappeared, it can be seen that an increase in the deformation rate promotes recrystallization. The XRD test results indicate that after low-temperature nitriding, metastable nitriding phase TiN0.26 is formed on the surface of TA2. The SEM morphology of the cross-section shows that a relatively special nitrided zone is formed, and mechanical performance test results indicate the wear resistance and hardness of the alloy increased.

Evolution of Microstructural and Mechanical Properties during Cold-Rolling Deformation of a Biocompatible Ti-Nb-Zr-Ta Alloy

“…It can be also remarked that deformation bands and twins become more and more visible as the intensity of cold-rolling deformation increases. Similar observations were obtained in the case of different types of Ti alloys [ 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 ]. The most obvious microstructural features induced by the intense deformation are shown in Figure 3 d, which illustrates the microstructure of the TNZT alloy when subjected to a 60% deformation degree.…”

The Effect of Solution Treatment Duration on the Microstructural and Mechanical Properties of a Cold-Deformed-by-Rolling Ti-Nb-Zr-Ta-Sn-Fe Alloy

“…When analyzing the spectral peak intensities, one can observe an alignment of the ( 200) and ( 211) peaks with the (110) peak, indicating a crystallographic texturing effect, which is also caused by intense cold deformation. Similar observations were also reported in other studies [49][50][51].…”

Effect of Cold-Rolling Deformation on the Microstructural and Mechanical Properties of a Biocompatible Ti-Nb-Zr-Ta-Sn-Fe Alloy

“…Additionally, it can be noted that, by raising the deformation degree, there is a corresponding increase in the elongation of the initial polyhedral Ti-β grains, with the most obvious deformation-induced microstructural features being seen in Figure 5f, which shows the alloy in its post-60% deformation state. Comparable observations have also been obtained for various types of Ti-alloys [20][21][22][23][24][25][26][27][28][29].…”