摘要
本文研究了５７３─１０７３Ｋ温度范围内３％奥氏体预变形对Ｆｅ－２９．９％Ｍｎ－６．０％Ｓｉ合金记忆效应的影响．结果表明，固溶态的样品经奥氏体预变形后，在室温变形时，记忆应变（ε（ｔｒ））、应变回复率（η）及记忆应变达到饱和所对应的应变值都得到了明显的提高：随预变形温度升高，室温经约２．５％变形后应变回复率增加，并在合金动态再结晶开始温度９７３Ｋ预变形后具有最大值９８％；经９７３Ｋ预变形，合金的最大记忆应变由固溶态的１．７％提高至３．８％，完全记忆应变达２．２％；奥氏体预变形的作用在于降低了室温诱发ε马氏体的临界应力．
Effect of 3% pre-straining of austenite on the improvement of SME in Fe-29.9% Mn-6.0%Si has been studied over the temperature range of 573-1073 K. Results show that recovery strain (εtr). shape recovery ratio (η) and strain corresponding to the saturation εtr for the solution treated samples deformed at room temperature have been improved significantly by pre-straining of austenite. The ηfor the samples with ～2.5% deformatin at room temperature increases with pre-straining temperature and the maximum ηcan be reached by pre-straining at 973 K when dynamic recrystallization has just occurred. After pre-straing at 973 K, the maximum εtr has been increased from 1.7% for solution treated sample to 3.8% and the complete recovery strain can reach 2.2%. It is believed that the pre-straining of austenite is to decrease the critical stress for the formation of ε martensite.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1995年第3期A125-A129,共5页
Acta Metallurgica Sinica
关键词
预变形
再结晶
形状记忆合金
铁锰硅合金
Fe-Mn-Sialloy, pre-straining, shape memory effect, dynamic recrystallization
