Role of carbon in improving the shape memory effect of Fe-Mn-Si-Cr-Ni alloys by thermo-mechanical treatments

被引：25
作者：
Peng, Huabei [1 ]
Song, Fan [1 ]
Wang, Shanling [2 ]
Zhang, Chengyan [1 ]
Wen, Yuhua [1 ]
机构：
[1] Sichuan Univ, Coll Manufacture Sci & Engn, Chengdu 610065, Peoples R China
[2] Sichuan Univ, Analyt & Testing Ctr, Chengdu 610065, Peoples R China
来源：
SMART MATERIALS AND STRUCTURES | 2015年 / 24卷 / 05期
基金：
中国国家自然科学基金;
关键词：
shape memory alloys; thermo-mechanical treatment; carbon; martensite; PRE-DEFORMATION; GRAIN-SIZE; MARTENSITIC-TRANSFORMATION; EPSILON TRANSFORMATION; MECHANICAL-PROPERTIES; ALPHA-MARTENSITE; MICROSTRUCTURE; IMPROVEMENT; NBC; PRECIPITATION;
D O I：
10.1088/0964-1726/24/5/055010
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
To clarify the role of carbon in improving the shape memory effect of Fe-Mn-Si-based shape memory alloys by thermomechanical treatments, we investigated the effect of optimum thermomechanical treatments on shape memory effect and microstructures of Fe-14Mn-5Si-8Cr-4Ni and Fe-14Mn-5Si-8Cr-4Ni-0.12C alloys. The Cr23C6 particles in optimum thermomechanical-treated Fe-14Mn-5S-8Cr-4Ni-0.12C more effectively prevented collisions between stress-induced epsilon martensite bands than the residual alpha' martensite in optimum thermomechanical-treated Fe-14Mn-5Si-8Cr-4Ni. This result is attributed to the thinner width of stress-induced epsilon martensite bands in optimum thermomechanical-treated Fe-14Mn-5S-8Cr4-Ni-0.12C compared to optimum thermomechanical-treated Fe-14Mn-5Si-8Cr-4Ni. In addition, the Cr23C6 particles formed at more sites and provided more obstacles as compared with the residual alpha' martensite. Accordingly, the recovery strain of Fe-14Mn-5Si-8Cr-4Ni-0.12C was higher than that of Fe-14Mn-5Si-8Cr-4Ni. It is concluded that carbon addition is beneficial to further improving the shape memory effect of Fe-Mn-Si-based shape memory alloys by thermomechanical treatments.
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页数：10
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