Effect of deformation temperature on mechanical properties and microstructure of TWIP steel for expansion tube

High Temperature Materials and Processes

Dengke Wang¹  Kaihong Song¹  Haitao Xue¹ 

[1] School of materials science and engineering, Hebei University of Technology, Tianjin, China;

关键词: twip steel;    deformation temperature;    mechanical property;    deformation twins;   

DOI  :  10.1515/htmp-2020-0020

来源: DOAJ

【 摘 要 】

According to the downhole temperature filed, the mechanical behavior of TWIP steel for expansion tube was studied in the temperature range from 25°C to 300°C. Meanwhile, the phase and microstructure changes before and after deformation were investigated by X-ray diffractometer (XRD), optical microscope (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results indicate that yield strength, tensile strength and elongation decrease with temperature increasing. The TWIP steel is single-phase of austenite before and after deformation. Analysis on the microstructure shows that the deformation twins gradually decrease with increasing temperature. The deformation process cannot benefit from the deformation twins, which is responsible for the decreased ductility. In addition, due to the increased temperature, the stacking fault energy becomes high enough to restrain twinning, thus dislocation glide becomes the main deformation mechanism.

【 授权许可】

Unknown