STUDY ON THE MARTENSITE IN LOW CARBON CrNi3Si2MoV STEEL TREATED BY Q&P PROCESS
WANG Cunyu, SHI Jie, CAO Wenquan, HUI Weijun, WANG Maoqiu, DONG Han
Institute for Structural Materials, Central Iron & Steel Research Institute, Beijing 100081
Cite this article:
WANG Cunyu SHI Jie CAO Wenquan HUI Weijun WANG Maoqiu DONG Han. STUDY ON THE MARTENSITE IN LOW CARBON CrNi3Si2MoV STEEL TREATED BY Q&P PROCESS. Acta Metall Sin, 2011, 47(6): 720-726.
Abstract The martensite in low carbon CrNi3Si2MoV steel treated by Q&P (quenching and partitioning) process was characterized by means of SEM, TEM, EBSD and nano intender. The effect of martensite on uniaxial tension behaviors was discussed. The results showed that initial martensite phase formed at the first quenching step, whose carbon content was lowered due to its carbon diffusion into untransformed austenite during partitioning step. However, the martensite phase formed at the final quenching steconsisted of only one single set of packet with lath thicknes about 0.1—0.2 μm, which was thinner than that of the initial martensie lath. It was found that the carbon content and hardness of the martenite formed in the final quenching step were higher than thoe of initial martensite, which deformed cooperatively with other phases and played a role of strengthening phase during deformation process. In addition, large sized carbonitride and oxide pecipitations induced nucleation and exansion of crack during deformation rocess.
Supported by National Basic Research Program of China (No.2010CB630803) and High Technology Research and Development Program of China (No.2009AA033401)
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