Twinning and martensite in a 304 austenitic stainless steel

Journal Article · Thu Aug 30 04:00:00 EDT 2012 · Materials Science and Engineering. A. Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2012.05.080· OSTI ID:1045106

Shen, Yongfeng; Li, Xi; Sun, Xin; Wang, Y D; Zuo, Liang

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.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1045106
• Report Number(s): PNNL-SA-88285; VT0505000
• Journal Information: Materials Science and Engineering. A. Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A. Structural Materials: Properties, Microstructure and Processing Vol. 552
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DEFORMATION
MARTENSITE
MICROSTRUCTURE
NUCLEATION
STACKING FAULTS
STAINLESS STEELS
STRAIN HARDENING
STRAIN RATE
STRAINS
TRANSFORMATIONS
TRANSMISSION ELECTRON MICROSCOPY
TWINNING
X-RAY DIFFRACTION