Abstract：Ridging defect can be significantly relieved by increasing the equiaxed ratio and grain density of ferritic stainless steel （FSS）. In this work， the pinning effect of Nb on the ferrite stainless steel grains was studied. When Nb was added to FSS， the as-cast grain size became smaller， and nanoscale particles were found at the grain boundary， of which the composition was dominated by[(Ti，][Nb)x(C，][N)y.]With the increase of Nb content， the number of fine precipitates is increased， and the Nb content in precipitates is gradually increased. Further analysis showed that， the solidification region will be extended by Nb， and Nb-rich[(Ti，][Nb)x(C，][N)y]will form at the end of solidification. The pinning effect of[(Ti，][Nb)x(C，][N)y]will also prevent the occurrence of grain boundary sliding and grain merging， refine the as-cast structure and increase the compactness degree of FSS.
收稿日期: 2018-02-05
出版日期: 2018-06-29
引用本文:
侯雨阳，成国光. Nb对双稳定铁素体不锈钢晶粒的钉扎作用[J]. , 2018, 37(03): 55-61.
HOU Yu-yang，CHENG Guo-guang. The pinning effect of Nb on the ferrite stainless steel grains. , 2018, 37(03): 55-61.
2018, Vol. 37 
