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Effects of aging on shape memory and wear resistance of a Fe–Mn–Si-based alloy

Published online by Cambridge University Press:  21 November 2014

Yongren Liu ,
Zhizhong Dong ,
Liming Yu ,
Yongchang Liu ,
Huijun Li  and
Lin Zhang
Yongren Liu
Affiliation:
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
Zhizhong Dong*
Affiliation:
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China; and Materials Research Institute for Energy Equipments, CFHI, 300457, China
Liming Yu*
Affiliation:
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
Yongchang Liu
Affiliation:
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
Huijun Li
Affiliation:
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
Lin Zhang
Affiliation:
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
*
a)Address all correspondence to these authors. e-mail: zzdongtju@gmail.com
b)e-mail: lmyu@tju.edu.cn
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Abstract

The influence of aging treatment on shape memory effect (SME) and wear resistance of Fe–20Mn–5Si–10Cr–5Ni–0.7V–0.2N (mass%) alloy was investigated. Results showed that vanadium nitride (VN) particles precipitated during aging treatment, and the amount and size of the particles increased with increasing aging time. The sample aged for 8 h exhibited the maximal shape recovery ratio of 74% (compared with that of 16% for unaged) and favorable wear resistance in both dry wear and oil-lubricant wear conditions. The fine VN particles are the key factor to improve the SME by strengthening the alloy and acting as preferential nucleation sites for martensite. However, more and larger particles due to further aging treatment appeared to have negative effects on the SME and wear resistance. After oil-lubricant friction, there existed large amounts of friction-stress-induced ε martensite in the worn surface of the sample. As a result, the wear resistance of samples in oil-lubricant wear condition was remarkably higher than that in dry wear condition.

Keywords

aging treatmentVN precipitatesshape memory effectwear resistance
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 23 , 14 December 2014 , pp. 2809 - 2816
Copyright
Copyright © Materials Research Society 2014 

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