Effect of alloying elements addition on the secondary tempering brittleness of Cr-Mo steels review
LI Xiao-bing1, DONG Xin2, XING Wei-wei1, CHEN Bo1, LIU Kui1, MA Ying-che1
1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China; 2. School of Materials and Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, China
Abstract：For some Cr-Mo steels (2.25Cr1Mo) which are usually serviced at medium temperature for a long time,the critical problem of the second type temper embrittlement is existed in these steels because of the continuous segregations of P,S and other harmful impurities to the grain boundary during the service. In order to explore some effective methods to reduce the temper embrittlement tendency of this kind of Cr-Mo steels and improve the reliability of the material,starting from the segregation mechanism of solute elements,the intrinsic essences of alloy elements segregation at grain boundary and its function on improving the temper brittleness of steel were analyzed. The segregation phenomena of several common elements and their influence on temper embrittlement of steel were mainly summarized. At the same time,the main reasons for the difference between theoretical calculation and experimental study are also analyzed. It is expected to provide some effective methods for temper embrittlement of medium temperature steel during long-term service,and offer some references for the study of grain boundary segregation behavior of alloying elements in future.
李小兵, 董鑫, 邢炜伟, 陈波, 刘奎, 马颖澈. 合金元素对Cr-Mo钢第二类回火脆性影响研究综述[J]. 钢铁, 2021, 56(3): 1-12.
LI Xiao-bing, DONG Xin, XING Wei-wei, CHEN Bo, LIU Kui, MA Ying-che. Effect of alloying elements addition on the secondary tempering brittleness of Cr-Mo steels review[J]. Iron and Steel, 2021, 56(3): 1-12.
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2021, Vol. 56 
