贝氏体区等温处理对超高强度TRIP钢组织及力学性能的影响

来源期刊：上海金属2011年第1期

论文作者：奚琰 赵金龙 史文 李麟

文章页码：34 - 38

关键词：TRIP钢； 贝氏体等温处理； 残余奥氏体； 力学性能

Key words：TRIP Steel； Isothermal Bainitic Processing； Retained Austenite； Mechanical Properties

摘    要：利用金相显微镜、EBSD技术、X射线衍射仪等研究了C-Si-Mn系冷轧TRIP钢贝氏体区等温处理对组织和力学性能的影响,并尝试利用间接方法控制TRIP钢中的相组成。结果表明,残余奥氏体直径在2~3μm之间,以椭圆状和细条状分布在铁素体晶界及晶内。随贝氏体区保温时间的延长,残余奥氏体体积分数先增大后减少,残余奥氏体中碳含量增多;随贝氏体区等温温度的升高,残余奥氏体体积分数达到峰值所需时间减少,峰值减小。相同等温时间下,等温温度越高,残余奥氏体中的碳含量越大。残余奥氏体的体积分数及其碳含量综合影响TRIP钢的力学性能。

Abstract: The influence of isothermal bainitic treatment on the microstructure and mechanical properties of cold rolled C-Si-Mn TRIP steel sheets was investigated by using optical microscopy,EBSD and XRD,and the volume fraction of different phases could be estimated by using indirect methodology.Results showed that the diameter of retained austenite was within 2~3 μm,distributed on the boundaries of the ferrite.The amount of austenite increased and then decreased with the increasing of bainitic holding time,while the carbon content of the austenite increased.The maximum volume fraction of austenite and the time reaching the maximum dropped rapidly with the increasing of bainitic holding temperature.The higher the holding temperature was,the more the carbon amount could be obtained in retained austenite.In fact,the amount of retained austenite and its carbon content influenced the mechanical properties of TRIP steel.