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Microstructure, mechanical properties and transformation behavior of friction stir welded Ni50.7Ti49.3 alloy
Materials & Design ( IF 8.4 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.matdes.2020.108491
Huaibo Deng , Yuhua Chen , Shuhan Li , Chao Chen , Timing Zhang , Mingfang Xu , Di Ji

Abstract To confirm the factors of deteriorating the mechanical properties of joints and the law of transformation behavior along welds thickness, different rotation speeds were conducted for friction stir welding Ni50.7Ti49.3 alloy. Results showed that intermetallic compounds were deteriorated the mechanical properties of joints, and the joint failed before the martensitic platform appeared. W13Re7 and Ti2Ni granular shaped were distributed at the shoulder affected zone (SAZ), and this region was embrittled. Removing the brittle layer of welds surface via post-welded pickling (PWP), the tensile strength of joint at a rotation speed of 600 rpm reached 751 MPa, which reached 79.1% compared with that of the base metal (BM). After the friction stir welding (FSW), the DSC was exhibited the martensite–austenite phase transformation (B19′–B2) in the pin affected zone (PAZ) and SAZ, shown shape memory effect. Phase transformation temperatures (TTs) drifted forward to positive direction about 20 K after welding. Transformation hysteresis in SAZ decreased from 19.46 °C to 12.36 °C with increasing rotation speed from 475 rpm to 950 rpm under heat and deformation of FSW process.

中文翻译:

搅拌摩擦焊Ni50.7Ti49.3合金的组织、力学性能及相变行为

摘要 为确定接头力学性能恶化的因素及沿焊缝厚度的转变行为规律,对搅拌摩擦焊Ni50.7Ti49.3合金进行了不同转速试验。结果表明,金属间化合物使接头的力学性能恶化,接头在马氏体平台出现之前就失效了。W13Re7和Ti2Ni颗粒状分布在肩部影响区(SAZ),该区域脆化。通过焊后酸洗(PWP)去除焊缝表面脆性层,600 rpm转速下接头的抗拉强度达到751 MPa,与母材(BM)相比达到79.1%。搅拌摩擦焊(FSW)后,DSC 在销钉影响区 (PAZ) 和 SAZ 中表现出马氏体-奥氏体相变 (B19'-B2),表现出形状记忆效应。焊接后相变温度 (TTs) 向前漂移约 20 K。在 FSW 过程的加热和变形下,随着转速从 475 rpm 增加到 950 rpm,SAZ 中的转变滞后从 19.46 °C 降低到 12.36 °C。
更新日期:2020-04-01
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