王新宇,李文亚,马铁军,等.焊前及焊后热处理对TC11钛合金线性摩擦焊接头组织性能的影响[J].精密成形工程,2019,11(6):1-7.
WANG Xin-yu,LI Wen-ya,MA Tie-jun,et al.Effects of Pre- and Post-weld Heat Treatments on Microstructure and Mechanical Properties of Linear Friction Welded TC11 Titanium Alloy Joints[J].Journal of Netshape Forming Engineering,2019,11(6):1-7. |
| 焊前及焊后热处理对TC11钛合金线性摩擦焊接头组织性能的影响 |
| Effects of Pre- and Post-weld Heat Treatments on Microstructure and Mechanical Properties of Linear Friction Welded TC11 Titanium Alloy Joints |
| 投稿时间：2019-08-29 修订日期：2019-11-10 |
| DOI：10.3969/j.issn.1674-6457.2019.06.001 |
| 中文关键词: 线性摩擦焊 钛合金 热处理 微观组织 力学性能 |
| 英文关键词: linear friction welding titanium alloy heat treatment microstructure mechanical properties |
| 基金项目:国家自然科学基金（51675435） |
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| 摘要点击次数: 2613 |
| 全文下载次数: 1894 |
| 中文摘要: |
| 目的 研究焊前及焊后热处理（950 ℃+1 h+AC/540 ℃+6 h+AC）对TC11钛合金线性摩擦焊接头组织演变和力学性能的影响。方法 采用光镜、扫描电镜、显微硬度及拉伸试验对不同热处理条件下的接头进行了组织分析和力学性能测试。结果 金相结果表明，焊前热处理对焊接过程中接头的组织演变影响较小。在焊态和焊前热处理接头的焊接中心区域（WCZ）观察到类似的马氏体组织，但明显的热影响区域只能在焊前热处理接头中找到。焊后热处理后，WCZ中的马氏体组织转变为网篮组织，热力影响区（TMAZ）的初生α和转变β晶粒均有一定程度的长大。力学性能结果表明，焊前热处理可以提高整个接头的显微硬度，但硬度分布趋势与焊态接头的分布趋势相似。结论 焊后热处理可以降低WCZ和TMAZ的显微硬度，但母材的显微硬度有所提高。焊前和焊后热处理都可以提高接头抗拉强度，但会降低接头伸长率，特别是在焊前热处理条件下。 |
| 英文摘要: |
| The paper aims to study the effects of pre- and post-weld heat treatments (950 ℃+1 h+AC/540 ℃+6 h+AC) on the microstructure evolution and mechanical properties of linear friction welded TC11 titanium alloy joints. Optical microscope, scanning electron microscope microhardness test and tensile test were adopted for structure analysis and mechanical property test of joints under different heat treatment conditions. The metallographic results indicated that the pre-weld heat treatment had a less effect on the microstructure evolution of joint during the welding process. A similar martensite microstructure was observed at the weld center zone (WCZ) in both the as-welded (non-heat-treated) and pre-weld heat-treated joints, but an obvious heat affected zone can only be found in the pre-weld heat-treated joint. After post-weld heat treatment, the martensite microstructure in WCZ transformed to basket-weave structure, and both primary α and transformed β grains in thermomechanically affected zone (TMAZ) grew to some extent. Mechanical properties results showed that pre-weld heat treatment can improve the microhardness in the whole joint, but the distribution tendency was similar to that in the as-welded joint. Post-weld heat treatment can reduce the microhardness in WCZ and TMAZ, but lightly increase the microhardness in base material. Both pre- and post-weld heat treatments can improve the tensile strength, but reduce the joint elongations, especially in the pre-weld heat-treated condition. |
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