关键词: 控轧工艺, 控冷工艺, X120 管线钢, 碳氮化物, 析出, Orowan 机制

Abstract:

This paper deals with the effects of such rolling parameters as the deformation in non-recrystallization region,the cooling rate and the final cooling temperature on the carbonitride precipitation from X120 pipeline steel in different controlled rolling and cooling processes,and theoretically estimates the strength contribution of precipitated phase based on the Orowan mechanism. The results show that the rolling process has no effect on the type and structure of the precipitated phase,that the increase of deformation in non-recrystallization region mainly promotes the precipitation of Nb and improves the yield strength of X120 pipeline steel,and that the cooling rate and the final cooling temperature have little influence on the precipitation of carbonitride.

Key words: controlled rolling process, controlled cooling process, X120 pipeline steel, carbonitride, precipitation, Orowan mechanism