Yang Huanping, Yan Wenbin, Deng Xuyang, Zhang Mengqi, Wang Yaomian
School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Shaanxi Key Laboratory of Nano Materials and Technology, Xi'an 710055, China.
Materials (Basel). 2022 Mar 31;15(7):2585. doi: 10.3390/ma15072585.
To improve the shape memory effect, the solutionized Fe-24Mn-6Si-9Cr-6Ni alloy was shot peened and subsequently annealed. The phase constituent was examined using the X-ray diffraction method. Microstructure evolution was characterized using an optical microscope and the electronic backscatter diffraction method, and the shape memory effect was evaluated using a bending test. The results show that α'-martensite and ε-martensite were introduced into the shot-peened surface layer. The α'-martensite remained after annealing even at 850 °C. Microstructure of the surface layer was refined through shot peening and subsequent annealing. Compared with those of the solutionized specimen, the shape recovery ratio and recovery strain of the specimens that are shot peened and subsequently annealed are significantly improved at different prestrains.
为提高形状记忆效应，对固溶处理后的Fe-24Mn-6Si-9Cr-6Ni合金进行喷丸处理，随后进行退火。采用X射线衍射法检测相组成。利用光学显微镜和电子背散射衍射法表征微观结构演变，并通过弯曲试验评估形状记忆效应。结果表明，喷丸处理的表层引入了α'-马氏体和ε-马氏体。即使在850℃退火后，α'-马氏体仍保留。通过喷丸处理和随后的退火，表层微观结构得到细化。与固溶处理试样相比，喷丸处理并随后退火的试样在不同预应变下的形状恢复率和恢复应变均显著提高。
