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淬火冷却速率对一种稀土变形镁合金残余应力和力学性能的影响

Effects of Quenching Cooling Rate on Residual Stress and Mechanical Properties of a Rare-Earth Wrought Magnesium Alloy.

作者信息

Xie Qiumin, Wu Yunxin, Zhang Tao, Peng Shunli, Yuan Zhongyu

机构信息

School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.

College of Intelligent Manufacturing and Mechanical Engineering, Hunan Institute of Technology, Hengyang 421002, China.

出版信息

Materials (Basel). 2022 Aug 16;15(16):5627. doi: 10.3390/ma15165627.

DOI:10.3390/ma15165627
PMID:36013765
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9412506/
Abstract

To investigate the effect of quenching rate on microstructure, residual stress (RS) and mechanical properties of a rare-earth wrought magnesium alloy Mg-Gd-Y-Zr-Ag-Er, RS in 20 °C water quenching (WQ (20 °C)), 100 °C water quenching (WQ (100 °C)) or air cooling (AC) conditions were measured and compared with the simulation results, corresponding mechanical properties and microstructure in quenching and aging state were studied. The decrease of quenching rate has little effect on the grain size but makes the twinning disappear, precipitates increase and the texture weakened, leading to easier brittle fracture after aging. WQ (100 °C) is the best quenching condition in this study, with a significant decline in RS and only 4.9% and 3.7% decrease in yield stress (YS) and hardness compared with WQ (20 °C). The results make it feasible to invent an appropriate quenching method of greatly reducing RS while maintaining mechanical properties. The research conclusions would be beneficial to the application of the alloy.

摘要

为研究淬火速率对稀土变形镁合金Mg-Gd-Y-Zr-Ag-Er微观组织、残余应力（RS）及力学性能的影响，测量了该合金在20℃水淬（WQ(20℃)）、100℃水淬（WQ(100℃)）或空冷（AC）条件下的残余应力，并与模拟结果进行比较，研究了相应的淬火和时效状态下的力学性能及微观组织。淬火速率的降低对晶粒尺寸影响不大，但会使孪晶消失、析出相增多且织构减弱，导致时效后更容易发生脆性断裂。WQ(100℃)是本研究中的最佳淬火条件，与WQ(20℃)相比，残余应力显著降低，屈服应力（YS）和硬度仅分别降低4.9%和3.7%。研究结果表明，发明一种在保持力学性能的同时大幅降低残余应力的合适淬火方法是可行的。研究结论将有助于该合金的应用。

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