采用热力模拟试验机对碳质量分数为0.159 1%的碳锰钢冷轧板进行了不同温度和时间的等温退火热处理,对热处理后的拉伸性能进行了测试,依据加权方法建立了分段拉伸性能数学模型,并进行了验证.结果表明:试验钢的屈服强度随等温温度的升高及保温时间的延长而降低,抗拉强度总体上随等温温度升高和保温时间而降低,但变化规律较复杂;伸长率的变化趋势与强度的变化趋势相反;建立的数学模型具有较好的精度,计算得到的屈服强度、抗拉强度和伸长率与试验值的相对误差分别为3.93%,3.21%和19.91%.
Isothermal annealing heat treatment experiment of C-Mn cold-rolled sheet with carbon content 0.159 1wt% was carried out by using thermomechanical simulation testing machine at different temperatures and holding time, and then the steel's tensile properties was tested.A segmented tensile properties mathematical model based on the weighting method was built and verified.The results show yield strength of the tested steel decreases with the increase of isothermal temperature and holding time.The change rules of tensile strength with isothermal temperature and holding time are relatively complex;from a general view, the tensile strength decreases with the increase of isothermal temperature and the holding time.The change trend of elongation is opposite to that of the strengths.The segmented mathmatical model has good accuracy, the relative errors of yield strength, tensile strength and elongation from calculation and experiment are 3.93%, 3.21% and 19.91%, respectively.
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