Energetics of plastic deformation of metastable austenitic stainless steel

被引：6
|
作者：
Talonen, Juho [1 ]
Hanninen, Hannu [1 ]
机构：
[1] Aalto Univ, Dept Mech Engn, Lab Engn Mat, FIN-02015 Helsinki, Finland
来源：
STEEL RESEARCH INTERNATIONAL | 2007年 / 78卷 / 03期
关键词：
austenitic stainless steel; strain-induced martensite; stored energy; free energy change;
D O I：
10.1002/srin.200705889
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The change in the internal energy during uniaxial tensile deformation of austenitic stainless steels EN 1.4301 (AISI 304) and EN 1.4318 (AISI 301LN) was determined by measuring the extent of gamma ->alpha'-martensite transformation and the temperature increase of the samples. From the results the fraction of the stored energy of cold work and the free energy change related to the strain-induced gamma ->alpha'-martensite transformation were determined. The fraction of stored energy varied around 0.4. With the metastable steel grades the free energy change related to the gamma ->alpha'-martensite transformation was found to vary between -98 MJ/m(3) and -206 MJ/m(3) depending on the austenite stability of the steel. Furthermore, the magnitude of the mechanical driving force was estimated by comparing the results with the free energy change of thermally induced transformation.
引用
收藏
页码：260 / 265
页数：6
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