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采用不同的淬火-分配热处理工艺对空心楼盖钢板进行了热处理,研究了淬火终点温度和分配时间对钢板力学性能、强塑积、物相组成和显微组织的影响,并观察了不同热处理工艺下的拉伸断口形貌。结果表明,在相同分配时间下,钢板的抗拉强度随着淬火终点温度的升高而降低;强塑积-分配时间曲线与断后伸长率的变化趋势基本一致,断后伸长率的变化对最终产品的强塑积有重要的影响;当淬火终点温度为225℃、分配时间为90 s时,试样的残余奥氏体含量约为6.5%,明显高于其它热处理工艺下试样的残余奥氏体,试样的强塑积最高。
The effects of quenching end temperature and distribution time on the mechanical properties, strong plasticity, phase composition and microstructure of the steel plate were studied by using different quenching-distributing heat treatment process. The effects of different heat treatment processes Under the tensile fracture appearance. The results show that under the same distribution time, the tensile strength of the steel sheet decreases with the increase of the quenching end temperature. The change trend of the ductility-distribution time curve and the elongation at break is basically the same. The change of the elongation at break When the end temperature of quenching is 225 ℃ and the distribution time is 90 s, the residual austenite content of the sample is about 6.5%, which is obviously higher than that of the samples under other heat treatment processes Austenite, the highest plasticity of the sample.