GCr15钢渗碳体形核机制的研究与实验验证  

Study on nucleation mechanism of cementite in GCr15 steel and experimental verification

作　　者：陈其伟[1,2] 关建辉[2] 朱国辉[2] 赵爱民[1] 

机构地区：[1]北京科技大学高校轧制国家工程研究中心,北京100083 [2]安徽工业大学材料科学与工程学院,安徽马鞍山243002

出　　处：《材料热处理学报》2013年第5期186-190,共5页Transactions of Materials and Heat Treatment

摘　　要：GCr15钢的球化与渗碳体的形核机制具有密切的联系,为此采用KRC模型和超组元算法,计算了GCr15钢共析转变的相变自由能,根据相变过程能量的变化,分析了片状渗碳体晶核和球状渗碳体晶核的形核特点,并通过奥氏体化淬火实验和等温实验验证。结果表明:片层状渗碳体较球状渗碳体更具形核优势。当过冷奥氏体中不含有剩余碳化物颗粒时,一旦发生共析转变,过冷奥氏体将转变成片状珠光体组织。The spheroidizing of GCr15 steel is closely related to the nucleation mechanism of cementite. According to KRC model and super-element algorithm, the eutectoid transformation free energy in GCr15 steel were calculated. The nucleation characteristics of the lamellar eementite and the globular cementite were analyzed on the basis of the change of transformation free energy, and the quenching experiment of the steel austenized at different temperatures and the isothermal spheroidizing experiment were conducted for verification of the calculation results. Results show that the nucleation of the lamellar cementite is favoured comparing with that of the globular cementite in GCr15 steel. If there are no remaining carbide particles in the undercooled austenite, once the eutectoid transformation occurs, the undereooled austenite will transform into lamellar pearlite.

关 键 词：GCR15钢 渗碳体 形核 珠光体转变 

分 类 号：TG151.2[金属学及工艺—热处理]