摘要
为研究贝氏体相变温度对中碳热轧TRIP钢组织与性能的影响,采用扫描电镜(SEM)、X射线衍射(XRD)与高分辨透射电镜(HRTEM)对含Ti与Mo的中碳热轧TRIP钢进行了显微组织观察、残余奥氏体含量测定以及析出相的表征与分析.结果表明:在400℃贝氏体相变温度下,试验钢的残奥含量与强塑积均达到最大值,分别为28.2%和31.14 GPa·%;同时在钢中发现了呈块状、无规则形状以及片层状形貌分布的残余奥氏体,对衍射斑标定后显示,片层状残余奥氏体与铁素体基体同时满足kurdjumov-Sachs(K-S)与Nishiyama-Wasserman(N-W)位向关系;HRTEM分析显示,Mo可以溶入TiC而生成(Ti,Mo)C粒子,而纳米级的(Ti,Mo)C粒子可以显著提高钢的沉淀析出强化效果.
To investigate the influence of bainitic transformation temperature on microstructure and mechanical property of hot rolled medium carbon-TRIP steels, a series of experiments, such as scanning electron microscopy （ SEM ） , X-Ray diffraction （ XRD ） and High Resolution Transmission Electron Microscopy （ HRTEM） , were conducted. The results show that the bainitic transformation temperature have a significantly effects on retained austenite contents and mechanical properties of TRIP steels, and the optimal bainitic transformation temperature is 400℃, at which the retained austenite contents and the balance of strength and ductility were 28. 2% and 31. 14 GPa·%, respectively. Furthermore, it was found that the morphology of retained austenite consisted of Block type, Irregular type and Film type, and Film type austenite exhibited the kurdjumov-Sachs and Nishiyama-Wasserman orientation relationship with ferrite matrix, simultaneously. In addition, HRTEM analysis showed that Mo can incorporate into TiC to form （ Ti, Mo） C particle, which can obviously improve the strength of experimental steels.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2014年第2期61-67,共7页
Materials Science and Technology
基金
国家重点基础研究发展计划资助项目(2010CB630805)
