Nb元素对中碳钢加热过程中晶粒长大的影响  

Effect of Nb Element on Austenite Grain Growth of Medium Carbon Steel in Heating Process

作　　者：李殿杰 胡日荣 王金飞 李胜峰 张启富 韩宝云 武会宾[2] 

机构地区：[1]新冶高科技集团有限公司,北京100081 [2]北京科技大学冶金工程研究院,北京100083

出　　处：《热加工工艺》2016年第8期79-81,共3页Hot Working Technology

摘　　要：通过金相显微镜、透射显微镜以及热力学软件研究了Nb元素在加热过程中对中碳钢奥氏体晶粒长大的影响。结果表明:由于Nb溶质原子的拖曳和含Nb析出物钉扎的综合作用,相同加热条件下含Nb钢的奥氏体晶粒尺寸要小于无Nb钢。随着加热温度的升高,无Nb钢的奥氏体晶粒尺寸基本呈线性增加,含Nb钢在1200℃以下晶粒生长较慢,当加热温度高于1200℃时,由于含Nb析出物的溶解以及生长驱动力突然增加,晶粒生长速度突然提高。The effects of Nb additions on the austenite grain growth in medium carbon steel in heating process were studied by metalloscope, transmission electron microscope （TEM） and thermodynamic soft：ware. The results show that under the same heating conditions,the mean anstenite grain size of Nb-bearing steel is smaller than that of N-b-flee steel due to the combination of solute drag induced by Nb atoms and pinning effect induced by Nb-containing precipitate, ha addition, the austenite grain size of Nb-free steel increases lineally with the increase of heating temperature, but that of N-b-bearing steel grows slowly when the heating temperature is under 1200℃. It would increase fast when the heating temperature is over 1200℃ due to the dissolving of precipitation and the sudden increase in grain growth speed.

关 键 词：Nb 微合金化 中碳钢 奥氏体 晶粒尺寸 

分 类 号：TG113[金属学及工艺—物理冶金]