High-Superelasticity NiTi Shape Memory Alloy by Directed Energy Deposition-Arc and Solution Heat Treatment

扫码查看

原文链接

万方数据
维普

外文摘要：Directed energy deposition-arc(DED-Arc)technology has the advantages of simple equipment,low manufacturing cost and high deposition rate,while the use of DED-Arc has problems of microstructure inhomogeneity,position dependence of macroscopic mechanical properties and anisotropy.Therefore,it is necessary to carry out a subsequent heat treatment to improve its microstructure uniformity,mechanical properties and superelasticity.In this investigation,the DED-Arc 15-layer NiTi alloy thin-walled parts with the solution treatment at different process parameters were studied to analyze the effects of solution heat treatment on microstructure,phase composition,phase transformation,microhardness,tensile and superelasticity.The temperature range of solution treatment is 800-1050 ℃,and the treatment time range is 1-5.5 h.The results show that after solution treatment at 800 ℃/1 h,the content of precipitated phase decreases,the grain is refined,the microhardness increases,and the mechanical properties in the 0° direction are improved.The strain recovery rate after 10 tensile cycles has increased from 37.13％(as-built)to 49.25％(solid solution treatment).This research provides an effective post treatment method for high-performance DED-Arc NiTi shape memory alloys.

外文关键词：

Directed energy deposition-arc(DED-Arc)Cold metal transfer(CMT)NiTi shape memory alloysMicrostructurePhase transformationSolution heat treatment

作者：

Junyi Ma、Lin Yu、Qing Yang、Jie Liu、Lei Yang

展开 >

作者单位：

State Key Laboratory of Materials Processing and Die& Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430070,China

School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430074,China

基金：

国家自然科学基金State Key Laboratory of Materials Processing and Die & Mould TechnologyAnalytical & Testing Center,Huazhong University of Science and Technology for the extensive experiments

项目编号：

52105396

出版年：

2024

DOI：

10.1007/s40195-023-01659-9

金属学报(英文版)

中国金属学会

金属学报(英文版)

CSTPCD

影响因子：0.77

ISSN：1006-7191

年,卷(期)：2024.37(1)

参考文献量60