摘要:
通过SEM、EBSD、XRD、室温拉伸性能测试等分析手段,研究了退火温度对1 000 MPa级Q&P钢组织演变、力学性能、残余奥氏体的影响。结果表明:800~900℃退火,室温组织主要由铁素体(F)+马氏体(M)+残余奥氏体(RA)组成,随着退火温度的升高,马氏体的体积分数增加,且马氏体内部板条逐渐清晰。随着退火温度的升高,残余奥氏体的比例增加,晶界越多的地方残余奥氏体越密集。在850℃退火时,强度和塑性达到最佳结合,抗拉强度为991.33 MPa,延伸率为18.58%,达到Q&P980强塑性标准(抗拉强度≥980 MPa,延伸率≥15%)要求。
Abstract:
In this work effect of annealing temperature on microstructure,mechanical properties and retained austenite of 1 000 MPa Q＆P Steel were studied by means of SEM,EBSD,XRD and tensile test at room temperature.Results showed that the microstructure at room temperature was mainly composed of ferrite（F） + martensite（M） + retained austenite when the experimented steel was anneal at 800 ～900 ℃.With the increase of annealing temperature,the volume fraction of martensite increased,and the appearance of the internal lath of martensite became clearer.With the increase of annealing temperature,the volume fraction of retained austenite increases. The more grain boundaries,the denser the retained austenite. When anneal at 850 ℃,the best match of strength and plasticity of resulted steel was achieved,with the tensile strength of 991.33 MPa and the elongation of 18.58%,meeting the Q＆P 980 standard requirements.
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