第二相与晶粒粗化时间及粗化温度  

SECOND-PHASE ON GRAIN COARSENING TIME AND TEMPERATURE

作　　者：雍岐龙[1] 李永福[1] 孙珍宝[2] 吴宝榕[2] 干勇[2] 

机构地区：[1]云南工学院 [2]钢铁研究总院

出　　处：《钢铁》1993年第9期45-50,共6页Iron and Steel

基　　金：国家自然科学基金

摘　　要：根据第二相的固溶度积公式,Ostwald熟化规律和第二相阻止晶粒长大的理论,提出了确定加热温度下奥氏体晶粒粗化时间和确定加热时间下奥氏体晶粒粗化温度的理论计算方法,并对0.04C-0.24Nb钢进行了高温金相试验和相应的理论计算,理论计算结果和试验结果良好吻合,这证明该理论计算方法是可行的,同时证实了高温下碳氮化铌质点的Ostwald熟化过程是受铌在钢中的体扩散所控制的。According to the solid solubility equation and Ostwald ripening law of second-phase and the theory of second-phase inhibiting grain growth, a theoretic calculation method for the austenite grain caorsening time at certain reheating temperature and the austenite grain coarsening temperature at certain reheating time of the grain refining steel has been proposed, and the high-temperature metallographic experiment and the concerned calculation for 0.04C-0.24Nb steel have been carried out. The calculated result is consistent well with the experimental one, which has shown that the calculation method is feasible and that the Ostwald ripening process of niobium carbonitride particles is controlled by the lattice diffusion of niobium in steel.

关 键 词：粗化温度 晶粒粗化 第二相 奥氏体晶粒 固溶度 晶粒长大 加热温度 吻合 高温 试验结果 

分 类 号：TF125.3[冶金工程—粉末冶金] TG146[冶金工程—冶金物理化学]