摘要
针对66mm厚TA15M钛合金件的真空电子束焊接,从焊接工艺、材料、机械性能进行系统性分析,研究了不同焊接工艺参数对接头组织、力学性能及残余应力状态的影响,提出了合理的焊接工艺。试验结果表明:随着焊接速度加快,焊缝及热影响区宽度减小,焊接残余应力呈降低趋势;焊缝抗拉强度接近母材,焊后普通退火(800℃×2.5h,AC)热处理可使TA15M钛合金电子束焊接快速热循环造成的亚稳态组织(α'、亚稳β)充分分解,使焊缝硬度、强度和塑韧性均有很好的表现。
Regarding the vacuum electron beam welding for 66 mm-thick TA15 M titanium alloy parts,a systematic analysis is carried out through welding technology, material and mechanical properties. The influence of different process parameters on the microstructure, mechanical properties and residual stress state of the joint are studied, and the reasonable welding process is proposed. The experimental results show that with the increase of welding speed,the width of the joint and the heat affected zone decreases, and the welding residual stress also decreases. The tensile strength of the joint is close to the base metal＇s. And the conventional annealing（800℃×2.5 h,AC） after welding can fully decompose the metastableα＇ and β structures caused by the rapid thermal cycle in electron beam welding,thus bringing about nice performances in hardness, strength, plasticity and toughness.
出处
《工具技术》
北大核心
2017年第10期92-95,共4页
Tool Engineering
基金
国家科技重大专项(2013ZX0410041)
关键词
电子束焊
力学性能
微观组织
钛合金
electron beam welding
mechanical property
microstrueture
titanium alloy
