摘要
通过理论计算不同Nb含量9310钢中碳化物析出相的体积分数和颗粒半径,并对比验证相应的金相组织,研究了Nb微合金化9310钢中碳化物的析出规律。结果表明,随加热温度的升高,钢中Nb的固溶量逐渐增多,析出相NbC的体积分数逐渐减小,同时发生Oswald熟化。当温度为1050℃时,含Nb钢中析出相颗粒半径不小于50 nm;当温度高于1150℃时,钢中0.047%的微量Nb才能够完全固溶;含Nb钢中细小的NbC颗粒钉扎晶界,有效抑制了奥氏体晶粒的粗化,可使晶粒粗化温度从1000℃提高到1150℃。
By theoretical calculation of volume fraction and particle radius of precipitates phase in 9310 steel with different content of Nb, by the observation of the microstructure of test steel, the carbide precipitation regularity in Nb-microalloyed 9310 steel was studied. The results show that, with the heating temperature increasing, the amount of dissolved Nb in steel gradually increases, the amount of undissolved Nb and the volume fraction of precipitation NbC phase decrease gradually, and Oswald ripening happens at the same time; when the temperature is 1050 ℃, the particles precipitate radius of steel containing Nb is not less than 50 nm, when the temperature is higher than 1150 ℃, the content of 0.047% Nb in steel can dissolve completely. The grain boundary is pinned by NbC particles in Nb-microalloyed 9310 steel, and the austenite grain coarsening is effectively prevented. The grain coarsening temperature increases from 1000 ℃ into 1150 ℃.
出处
《热加工工艺》
CSCD
北大核心
2014年第4期106-109,共4页
Hot Working Technology
关键词
NB微合金化
9310钢
析出相
晶粒粗化
Nb micro-alloying
9310 steel
precipitated phase
grain coarsening
