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以汽车用冷轧高强复相钢为研究对象，利用SEM,EBSD,XRD和单向拉伸等检测手段，研究了退火温度对汽车用复相钢组织与性能的影响.结果表明：实验钢经不同温度退火后空冷得到的组织均为铁素体、马氏体和贝氏体；退火温度越高，马氏体和贝氏体的含量越多，铁素体的含量越少；随着退火温度的升高，实验钢的屈服强度及抗拉强度均呈现先升高后降低的趋势，伸长率则与之相反.XRD分析结果表明，实验钢经不同温度退火后，奥氏体全部发生转化，空冷至室温时无残余奥氏体存在.当退火温度为850℃时，实验钢获得了最佳力学性能，其抗拉强度为990 MPa,屈服强度为818 MPa,伸长率为23.3%,强塑积为23.07 GPa·%.
Abstract：Taking cold-rolled high-strength duplex steel for automobiles as the research object, the effect of annealing temperature on the microstructure and properties of duplex steel for automobiles has been studied by SEM, EBSD, XRD, and uniaxial tensile testing methods. The results show that the microstructures of experimental steel after annealing at different temperatures and air cooling are all ferrite, martensite, and bainite. The higher the annealing temperature, the more martensite and bainite content, and the less ferrite content. The yield strength and tensile strength of the test steel show a trend of first increasing and then decreasing with the increase of annealing temperature, while the elongation is the opposite. The XRD analysis results indicate that after annealing at different temperatures, all austenite in the test steel undergoes transformation, and no residual austenite exists when air cooled to room temperature. When the annealing temperature is 850 ℃, the experimental steel obtains the best mechanical properties, with a tensile strength of 990 MPa, a yield strength of 818 MPa, an elongation of 23.3%, and a strength plastic product of 23.07 GPa·%.
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基本信息:
DOI：10.14186/j.cnki.1671-6620.2024.06.011
中图分类号:TG142.1;TG156.2
引用信息:
[1]吴亚辉,张波,冯运莉等.退火温度对冷轧复相钢组织和性能的影响[J].材料与冶金学报,2024,23(06):585-591.DOI:10.14186/j.cnki.1671-6620.2024.06.011.
基金信息:
国家自然科学基金项目(51974134); 河北省科技重大专项项目(21281008Z); 中央引导地方科技发展资金项目(236Z1014G)