摘要
以机械加工切削刀具材料Ti-3Al-2Fe-8V-1.5Mo钛合金为研究对象,在单相区加工锻坯,在不同温度下进行固溶+时效热处理;比较不同热处理后试样的力学性能和微观组织。结果表明:锻坯微观组织主要由β相组成,但仍存在少量晶界不连续的α相;在双相区温度下固溶,微观组织主要由长条或球状α相和亚稳态β相组成;在单相区温度下固溶,α相已全部转化为等轴的β相组织,随固溶温度升高,β相长大,晶粒尺寸变大;时效温度高于560℃时,随固溶温度升高,钛合金抗拉强度提高,塑性降低;在相同固溶条件下,随时效温度升高和时间延长,钛合金的抗拉强度降低,塑性提高。
A machining cutting tool materials Ti-3Al-2Fe-8V-1.5Mo titanium alloy was selected for study, the billet was forged in the single-phase temperature region, and solution and aging heat treatment were carried out at different temperatures;the mechanical properties and microstructure of the specimen after different heat treatment were compared. The test results show that the forging billet microstructure mainly consistes of β-phase, but there is still a small amount of grain boundary discontinuous α-phase; after solution treatment in duplex zone temperature, the microstructure is mainly composed of bar or ball α-phase and metastable β-phase; after solution treatment in single phase zone temperature, α-phase has been fully converted to equiaxed β-phase structure. With the solution temperature increasing, the β-phase growns and grain size becomes larger; when aging temperature is higher than 560℃, with the increase of solution temperature, tensile strength of titanium alloy increases and plastic becomes lower; under the same solution conditions, with the increase of aging temperature and the extend of aging time, the tensile strength of the titanium alloy is reduced, but the plasticity is improved.
出处
《热加工工艺》
CSCD
北大核心
2015年第20期223-225,228,共4页
Hot Working Technology
关键词
切削刀具
钛合金
微观组织
力学性能
cutting tool
titanium alloy
microstructure
mechanical properties
