Study on strong spinning preparation method and mechanism of the industrial pure titanium ultrafine crystallization

Yu Yang,Yanyan Jia

doi:10.1177/1558925019895256

Abstract

Ultrafine crystallization of industrial pure titanium allowed for higher tensile strength, corrosion resistance, and thermal stability and is therefore widely used in medical instrumentation, aerospace, and passenger vehicle manufacturing. However, the ultrafine crystallizing batch preparation of tubular industrial pure titanium is limited by the development of the spinning process and has remained at the theoretical research stage. In this article, the tubular TA2 industrial pure titanium was taken as the research object, and the ultrafine crystal forming process based on “5-pass strong spin-heat treatment-3 pass-spreading-heat treatment” was proposed. Based on the spinning process test, the ultimate thinning rate of the method is explored and the evolution of the surface microstructure was analyzed by metallographic microscope. The research suggests that the multi-pass, medium–small, and thinning amount of spinning causes the grain structure to be elongated in the axial and tangential directions, and then refined, and the axial fiber uniformity is improved. The research results have certain scientific significance for reducing the consumption of high-performance metals improving material utilization and performance, which also promote the development of ultrafine-grain metals’ preparation technology.

Highlights

The continuous development of the manufacturing industry puts higher demands on the reliability of metals under severe working conditions such as high temperature, high speed, high pressure, corrosive medium, and heavy load.1,2There are data showing that the annual losses caused by metal failure in China account for about 3% of the total output value of the national economy.3 the demand for high-performance, lightweight metals is becoming more and more urgent
The research on the preparation process of industrial pure titanium ultrafine crystallization is mainly focused on traditional high-pressure torsion, equal-diameter extrusion, multi-directional forging, and cumulative stack rolling
Study on process parameters and limiting thinning rate of ultrafine crystal industrial pure titanium prepared by strong spinning method

Summary

Introduction

The continuous development of the manufacturing industry puts higher demands on the reliability of metals under severe working conditions such as high temperature, high speed, high pressure, corrosive medium, and heavy load.1,2There are data showing that the annual losses caused by metal failure in China account for about 3% of the total output value of the national economy.[3] the demand for high-performance, lightweight metals is becoming more and more urgent. 2013, Xia Qinxiang of South China University of Technology proposed a combination of strong spinning and recrystallization annealing to prepare a cylindrical member with nano-ultrafine crystal structure. South China University of Technology has proved that the large thinning rate contributes to the ultrafine crystallization of metals.

Results

Conclusion