临界区退火对冷轧TRIP钢组织及力学性能的影响  

Effect of intercritical annealing temperature on microstructure and mechanical properties of cold-rolled TRIP steels

作　　者：付波[1] 杨王玥[1] 李龙飞[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《金属热处理》2015年第1期23-26,共4页Heat Treatment of Metals

基　　金：国家高技术研究发展计划(863计划)(2007AA03Z501);新金属材料国家重点实验室基金(2012Z-04)

摘　　要：利用扫描电子显微镜(SEM)、X射线衍射(XRD)以及室温单轴拉伸试验研究了临界区退火温度对低合金冷轧C-Mn-Al-Si系TRIP钢微观组织及力学行为的影响。结果显示,随着临界区退火温度的升高,TRIP钢组织中铁素体相和残留奥氏体相的含量降低,而贝氏体相的含量不断增加;试验钢的屈服强度和抗拉强度均提高,而塑性则不断下降。高临界区温度下形成了较多的贝氏体相,大量位于贝氏体板条间的片状残留奥氏体因变形过程中过于稳定而无法使TRIP效应得以充分的发挥,从而影响材料加工硬化能力的提高。The effect of intercritical annealing temperature on microstructure and mechanical behavior of low-alloy C-Mn-Al-Si cold-rolled TRIP steels was investigated assisted by scanning electron microscopy ( SEM) , X-ray diffraction ( XRD) and uniaxial tensile tests at room temperature.The volume fractions of ferrite and retained austenite, as well as the ferrite grain size, are decreased with the increase of intercritical annealing temperature, while that of bainite is increased.In addition, the yield and tensile strengths for the tested steels are raised with the increase of intercritical annealing temperature, while as opposed to this the total elongation decreases continuously.The larger volume fraction of bainite results in most of the retained austenite will be located between bainitic laths in the form of film under the condition of high intercritical annealing temperature.This type of retained austenite is considered to be very stable during deformation.As a result, the TRIP effect in such microstructure can not be developed sufficiently, which leads to the lower work hardening capability of materials.

关 键 词：临界区退火温度 TRIP钢 微观组织 力学行为 

分 类 号：TG156.2[金属学及工艺—热处理] TG142.1[金属学及工艺—金属学]