EFFECT OF NITROGEN ON TRANSFORMATION BEHAVIORS AND MICROSTRUCTURE OF V-N MICROALLOYED STEEL
Multi-pass deformation simulation tests were performed on V-N microalloyed steels with different nitrogen addition by using a Gleeble-3800 thermo-mechanical simulator and the corresponding continuous cooling transformation(CCT)diagrams were determined by thermal dilation method and metallographic method.The deformed austenite transformation behavior and resultant microstructure of the tested steels were studied.Furthermore,the effect of nitrogen addition on the transformation behavior and microstructure evolution was analyzed.The results show that the transformed microstructures in the three tested steels are ferrite,pearlite and bainite respectively while the transformation temperatures are not the same.For the two tested steel with higher nitrogen additions,higher ferrite start temperature and critical cooling rates are observed.Furthermore,an increase in nitrogen addition leads to increasing quantities of ferrite and the transformed ferrite is smaller in size.The hardness test results reveal that the hardness number increases with increasing nitrogen addition at low cooling rate while the value tends to be smaller due to increasing nitrogen addition at high cooling rate.Therefore,the hardness number of the steel with high nitrogen addition is not so sensitive to cooling rate as that of the steel with low nitrogen addition.
V-N microalloyed steel Transformation behavior Microstructure Hardness number
Zhao Baochun Zhao Tan Li Guiyan Lu Qiang
Technology Center of AnGang Steel Company Ltd.,Tiedong District 5.1 Road No.63,Anshan,Liaoning,11400 Ansteel Company Ltd. Bayuquan Subsidiary Company,Yingkou,Liaoning,115007,China
国内会议
杭州
英文
135-141
2015-11-11（万方平台首次上网日期，不代表论文的发表时间）