Effect of heat treatment process on precipitates and shape memory properties of Fe-15Mn-4.5Si-10Cr-5Ni shape memory alloy

doi:10.13251/j.issn.0254-6051.2021.12.002

Abstract

Abstract: Effects of direct aging, solution and aging heat treatment on the microstructure, precipitation of the second phase and shape memory effect of the tested alloy were studied by means of OM,TEM and physicochemical phase analysis in order to further improve the shape memory effect of Fe-15Mn-4.5Si-10Cr-5Ni shape memory alloy. The results show that,the shape memory performance of the specimen decreases obviously because the second phase particles redissolve greatly after solution heat treatment; At the same time, the direct aging treatment significantly increases the amount of Cr carbide second phase precipitation in the specimen compared with the solution and aging treatment, which greatly improves the shape memory performance of the specimen. The best shape recovery ultimately can be obtained by direct aging at 800 ℃.

Key words: shape memory alloy, shape memory effect, martensitic transformation, second phase, aging heat treatment

CLC Number:

TG139.6

Zhao Kai, Yang Zhongmin, Li Jiarui, Chen Ying, Cao Yanguang, Li Zhaodong. Effect of heat treatment process on precipitates and shape memory properties of Fe-15Mn-4.5Si-10Cr-5Ni shape memory alloy[J]. Heat Treatment of Metals, 2021, 46(12): 7-12.

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Effect of heat treatment process on precipitates and shape memory properties of Fe-15Mn-4.5Si-10Cr-5Ni shape memory alloy

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