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采用IQ、Q&P及I&Q&P热处理工艺,研究了预先Mn配分处理对低碳高强Q&P钢组织和力学性能的影响。结果表明,经IQ工艺处理的钢,由铁素体-珠光体的初始组织转变为铁素体-马氏体两相组织,转变过程中C、Mn元素不断向奥氏体内扩散,转变结束时C、Mn元素在奥氏体内呈现明显的富集现象。对于Q&P工艺,随着碳配分时间的延长,钢的抗拉强度都不断降低,伸长率先增加后减小,碳配分时间为60 s时,试样中残留奥氏体体积分数最大为12%,材料的塑性最优,其强塑积为20 GPa·%;相比Q&P工艺,由于经I&Q&P工艺处理后Mn元素仍然富集,在相同的碳配分时间下,钢的抗拉强度降低,但伸长率却得到了提高,碳配分时间为120 s时,试样中残留奥氏体体积分数最大为15%,材料的塑性最优,且强塑积达到最大值22 GPa·%。
Using IQ, Q & P and I & Q & P heat treatment process, the effect of pre-Mn fractionation on the microstructure and mechanical properties of low carbon high strength Q & P steel was studied. The results show that the steel treated by IQ process is transformed from the initial ferrite-pearlite to ferrite-martensite two-phase structure. During the transformation process, C and Mn elements continuously diffuse into the austenite and the transformation ends When C, Mn element shows obvious enrichment phenomenon in austenite. For the Q & P process, with the extension of the carbon allocation time, the tensile strength of the steel is continuously reduced, the elongation first increases and then decreases, the maximum retained austenite volume fraction of the sample is 12% when the carbon allocation time is 60 s, , The plasticity of the material is the best, and its plastic product is 20 GPa ·%. Compared with the Q & P process, the tensile strength of the steel decreases with the same carbon partitioning time because Mn is still enriched after I & Q & P treatment But the elongation is improved. When the carbon partitioning time is 120 s, the maximum volume fraction of retained austenite in the sample is 15%, the plasticity of the material is the best, and the maximum plastic modulus reaches 22 GPa ·%.