MICROSTRUCTURE EVOLUTION IN THE V-N-Ti AND Nb-V-Ti MICROALLOYED BULB FLAT STEEL
Microstructure evolution and impact thoughness of V-N-Ti and Nb-V-Ti microalloyed bulb flat steel in rolling process have been investigated.The results indicate that the V-N-Ti steel has superior impact toughness than Nb-V-Ti steel.Compared with Nb-V-Ti steel,the relatively higher N content increase the amount of undissolved TiN in V-N-Ti steel at 1220 oC,which can effectively inhibit the austenite grain coarsening.Meanwhile,N can also promote the precipitation of V(C,N)in V-N-Ti steel during the rolling process,V(C,N)can be able to promote the intragranular ferrite formation,inhibit the grain boundary ferrite grain coarsen and refine the ferrite grain,which lead to a favourable toughness; While the microstructure of Nb-V-Ti steel is coarsen ferrite and bainite which are detrimental to impact toughness.Compared with Nb-V-Ti steel,the V-N-Ti steel has a more appropriate composition design for bulb flat steel.
Bulb flat steel V-N-Ti Nb-V-Ti Austentie grain size V(C,N) Microstructure Toughness
Chai Feng Xue Dong-mei Yang Cai-fu SU Hang
Central Iron and Steel Research Institute,Beijing 100081,China
国内会议
杭州
英文
1045-1053
2015-11-11（万方平台首次上网日期，不代表论文的发表时间）