Increasing the yield strength while preserving strain hardenability and ductility in a beta titanium alloy exhibiting transformation induced plasticity (TRIP)
Increasing the yield strength while preserving strain hardenability and ductility in a beta titanium alloy exhibiting transformation induced plasticity (TRIP)
复制标题
提高屈服强度，同时保持具有相变诱导塑性 (TRIP) 的 β 钛合金的应变淬透性和延展性
DOI：
10.1016/j.scriptamat.2022.114890
复制
发表时间：
2022
影响因子：
6
通讯作者：
Banerjee, R.
中科院分区：
文献类型：
--
作者：
Nartu, M.S.K.K.Y.;Sharma, A.;Mantri, S.A.;Haridas, R.S.;Ren, Y;Banerjee, R.
商业β-Ti合金Ti-10 V-2Fe-3Al主要用于α+β显微组织，表现出高屈服强度，但应变硬化性差，延展性有限。本文重点研究了该合金中通过预先冷轧（5，10，20和30%）引入的应力诱发马氏体（α”）与后续拉伸加载过程中形成的额外马氏体（α”）之间的相互作用，从而获得了一种简单的方法，可以显著提高屈服强度，同时增强高应变硬化性（通过TRIP）并保持均匀的拉伸塑性。结果表明，通过冷轧，该合金的屈服强度可以在400 ~ 1800 MPa之间进行调节。在所分析的各种条件中，5%冷轧条件提供了最佳的YS（≥ 900 MPa）、延展性（8%）和应变硬化性的组合。在拉伸加载过程中，应力诱导α”的形成对于保持该合金的高应变硬化和均匀的拉伸塑性是必不可少的。
The commercial β-Ti alloy, Ti-10V-2Fe-3Al; primarily used with an α+β microstructure, exhibits a high yield strength but with poor strain-hardenability and limited ductility. This paper focuses on the interplay between stress-induced martensite (α”) in this alloy, introduced via prior cold-rolling (5,10, 20, and 30%) and additional martensite (α”) forming during subsequent tensile loading, leading to a simple way to substantially increase the yield strength while enhancing the high strain hardenability (via TRIP) and maintaining the uniform tensile ductility. The results indicate that the YS in this alloy can be substantially tuned from 400 to 1800 MPa, via cold-rolling. Among the various conditions that were analyzed, the 5% cold-rolled condition offered the best combination of YS (∼900 MPa), ductility (8%) and the strain hardenability. The stress-induced α” formation during tensile loading is essential for maintaining the high strain-hardening and, consequently the uniform tensile ductility in this alloy.