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Title: Twinning and martensite in a 304 austenitic stainless steel

Abstract

The microstructure characteristics and deformation behavior of 304L stainless steel during tensile deformation at two different strain rates have been investigated by means of interrupted tensile tests, electron-backscatter-diffraction (EBSD) and transmission electron microscopy (TEM) techniques. The volume fractions of transformed martensite and deformation twins at different stages of the deformation process were measured using X-ray diffraction method and TEM observations. It is found that the volume fraction of martensite monotonically increases with increasing strain but decreases with increasing strain rate. On the other hand, the volume fraction of twins increases with increasing strain for strain level less than 57%. Beyond that, the volume fraction of twins decreases with increasing strain. Careful TEM observations show that stacking faults (SFs) and twins preferentially occur before the nucleation of martensite. Meanwhile, both {var_epsilon}-martensite and {alpha}{prime}-martensite are observed in the deformation microstructures, indicating the co-existence of stress induced- transformation and strain-induced-transformation. We also discussed the effects of twinning and martensite transformation on work-hardening as well as the relationship between stacking faults, twinning and martensite transformation.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1045106
Report Number(s):
PNNL-SA-88285
VT0505000; TRN: US201214%%934
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Materials Science and Engineering. A. Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 552
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DEFORMATION; MARTENSITE; MICROSTRUCTURE; NUCLEATION; STACKING FAULTS; STAINLESS STEELS; STRAIN HARDENING; STRAIN RATE; STRAINS; TRANSFORMATIONS; TRANSMISSION ELECTRON MICROSCOPY; TWINNING; X-RAY DIFFRACTION

Citation Formats

Shen, Yongfeng, Li, Xi, Sun, Xin, Wang, Y. D., and Zuo, Liang. Twinning and martensite in a 304 austenitic stainless steel. United States: N. p., 2012. Web. doi:10.1016/j.msea.2012.05.080.
Shen, Yongfeng, Li, Xi, Sun, Xin, Wang, Y. D., & Zuo, Liang. Twinning and martensite in a 304 austenitic stainless steel. United States. doi:10.1016/j.msea.2012.05.080.
Shen, Yongfeng, Li, Xi, Sun, Xin, Wang, Y. D., and Zuo, Liang. Thu . "Twinning and martensite in a 304 austenitic stainless steel". United States. doi:10.1016/j.msea.2012.05.080.
@article{osti_1045106,
title = {Twinning and martensite in a 304 austenitic stainless steel},
author = {Shen, Yongfeng and Li, Xi and Sun, Xin and Wang, Y. D. and Zuo, Liang},
abstractNote = {The microstructure characteristics and deformation behavior of 304L stainless steel during tensile deformation at two different strain rates have been investigated by means of interrupted tensile tests, electron-backscatter-diffraction (EBSD) and transmission electron microscopy (TEM) techniques. The volume fractions of transformed martensite and deformation twins at different stages of the deformation process were measured using X-ray diffraction method and TEM observations. It is found that the volume fraction of martensite monotonically increases with increasing strain but decreases with increasing strain rate. On the other hand, the volume fraction of twins increases with increasing strain for strain level less than 57%. Beyond that, the volume fraction of twins decreases with increasing strain. Careful TEM observations show that stacking faults (SFs) and twins preferentially occur before the nucleation of martensite. Meanwhile, both {var_epsilon}-martensite and {alpha}{prime}-martensite are observed in the deformation microstructures, indicating the co-existence of stress induced- transformation and strain-induced-transformation. We also discussed the effects of twinning and martensite transformation on work-hardening as well as the relationship between stacking faults, twinning and martensite transformation.},
doi = {10.1016/j.msea.2012.05.080},
journal = {Materials Science and Engineering. A. Structural Materials: Properties, Microstructure and Processing},
number = ,
volume = 552,
place = {United States},
year = {2012},
month = {8}
}