Effect of Partial Solution Treatment on Toughness of 12%Cr-0.3%C Steels

この論文にアクセスする

この論文をさがす

著者

    • TSUCHIYAMA Toshihiro
    • Department of Materials Physics and Chemistry, Graduate School of Engineering, Kyushu University
    • TAKAKI Setsuo
    • Department of Materials Physics and Chemistry, Graduate School of Engineering, Kyushu University

抄録

In 12%Cr-0.3%C martensitic steels, the effect of partial solution (PS) treatment in the (γ+carbide) two phase region was investigated in terms of the relation between microstructure and impact toughness. PS treatment is very effective for refining γ grains, because insoluble carbide particles works as obstacles to grain growth. The γ grain refining results in a significant lowering of Ductile-Brittle Transition Temperature (DBTT). This is mainly due to the reduction of grain boundary stress concentration which is caused by pile-up of dislocations to grain boundary. Besides, PS treatment contributes to homogeneous dispersion of carbide particles: In specimens with full solution (FS) treatment, carbide particles precipitate along lath boundary of martensite during tempering, and this causes early crack initiation in impact testing. On the other hand, in specimens with PS treatment, carbides preferentially precipitate on insoluble carbide particles which have homogeneously dispersed within the martensite matrix. This results in an increase of upper shelf energy in impact testing. It was also found that PS treatment suppresses precipitation of grain boundary carbide which occurs during slow cooling from γ phase region, because the insoluble carbide particles provide preferential precipitation site within γ grains. As a result, DBTT is not dependent on cooling rate in PS treated specimens, although it is greatly raised in FS treated specimens with slow cooling because of the grain boundary precipitation of carbide.

収録刊行物

  • ISIJ international  

    ISIJ international 39(2), 202-208, 1999-02-15 

    The Iron and Steel Institute of Japan

参考文献:  17件

参考文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

各種コード

ページトップへ