文章信息/Info

Title:

Toughening Factors and Research Status of Fine-Grained Titanium Alloy for Micro-Screw

文章編號:

1674-3962(2020)10-0776-06

作者:

王凱旋1; 邵暉2; 單迪2; 孫峰1; 趙小花1; 劉向宏1

(1. 西部超導材料科技股份有限公司，陜西 西安 710018) (2. 西安理工大學，陜西 西安 710048)

Author(s):

WANG Kaixuan1，SHAO Hui2，SHAN Di2，SUN Feng1，ZHAO Xiaohua1，LIU Xianghong1

關鍵詞:

兩相鈦合金; 細晶; 強度; 韌性; 熱處理

Keywords:

two-phase titanium alloy;  fine grain;  strength;  toughness;  heat treatment

分類號:

TG146.23

DOI:

10.7502/j.issn.1674-3962.202007037

文獻標志碼:

A

摘要:

含有大量位錯和高角度晶界的大變形兩相微螺釘用細晶鈦合金具有良好的拉伸和疲勞性能，然而變形合金局部位錯、織構和微觀應力影響合金的韌性，引起了國內(nèi)外材料研究者的關注。目前，退火熱處理是改善變形鈦合金韌性的有效措施，但是變形畸變能誘發(fā)細小晶�？焖匍L大，導致合金強度大幅度下降，不利于提高其綜合力學性能。概述了典型兩相鈦合金組織特征參數(shù)和微觀應力對其韌化的影響規(guī)律，以Ti-6Al-4V合金為例分析了等徑通道塑性變形、高壓扭轉、累積變形、攪拌摩擦等大變形高強鈦合金韌化的研究現(xiàn)狀。同時，概述了一種新型電熱處理對大變形Ti-6Al-4V合金組織和韌化的影響規(guī)律，并展望了其在鈦合金領域的研究方向和目前存在的基礎科學問題。

Abstract:

Fine-grained large deformation two-phase titanium alloys with large amount of dislocations and high-angle grain boundaries have good tensile and fatigue properties. However, the partial dislocations, textures and micro-stress in the deformed alloy may not be beneficial for improving the toughness, which has attracted the attention of researchers at home and abroad. The annealing treatment is an effective method to regulate the strength-toughness synergy of the deformed alloy. However, the growth rate of fine grain could be accelerated by the deformation storage energy, which could result in the decrease in the strength. Therefore, the excellent comprehensive property is difficult to obtain by the traditional method. In this paper, the influence of microstructural parameters and micro�瞫tress on the toughness of titanium alloy is firstly reviewed. Secondly, the strength and toughness of titanium alloy are described based on the analysis of the large deformation mechanism (ECAP, HPT, multi�瞫tep deformation and FSP). Finally, the effect of a pulse current heating on the microstructure and toughness of high strength titanium alloy is identified, and the research direction and problem are further discussed in the current assisted deformation or heating processes of titanium alloys.