析出硬化型贝氏体钢连续加热转变研究  

Study on continuous heating transformation in a precipitation hardening bainitic steel

作　　者：张伟[1] 吴晓春[1] 闵永安[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200072

出　　处：《材料热处理学报》2009年第5期111-114,共4页Transactions of Materials and Heat Treatment

基　　金：上海市重点学科建设项目(T0101);上海市科委项目(065211028)

摘　　要：用热膨胀相变仪测定了贝氏体析出硬化钢10Ni3MnCuAl的连续加热转变曲线,并探讨了加热过程中的相变机制。结果表明,当加热速率小于1℃/s时,在300-600℃之间发生析出反应,为扩散型相变;在600-900℃之间,奥氏体化过程分两个阶段进行。第一阶段转变为扩散型相变,扩散激活能为505kJ/mol,第二阶段转变为切变型相变,较低的加热速率是造成奥氏体化过程分为两个阶段的原因。加热速率大于1℃/s时,无析出反应,奥氏体化过程只有一个阶段为切变机制。The continuous heating transformation curve of 10Ni3MnCuAl precipitation hardening bainitie steel was determined by using dilatometry and the transformation mechanism was discussed. The results show that the precipitation occurs between 300℃ and 600℃ through a diffusion process and the austenitizing process splits into two steps between 600℃ and 900℃ when the heating rate is below 1 ℃/s. The first step occurs through a diffusion process and the activation energy is 505kJ/mol, the second step occurs through a shear process. The slow heating rate is responsible for the splitting. When the heating rate is above 1 ℃/s, the precipitation does not take place and the austenitizing process occurs in only one stage through a shear process.

关 键 词：10Ni3MnCuAl钢 连续加热转变 相变机制 

分 类 号：TG142.2[一般工业技术—材料科学与工程]