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为研究建筑用高强度低合金钢在高温低应变速率下塑性变差的原因,分析了304与446不锈钢在不同应变速率下收缩率随温度的变化,计算钢材中P原子的临界时间与等效时间并量化应变速率对两种钢材热塑性的作用。结果表明,溶质原子的非平衡晶界偏聚是导致304和446不锈钢的热塑性变差的原因,且分别在850和800℃时晶界偏聚程度最大,塑性最小。处于偏聚阶段时,钢材的偏聚程度增大,塑性降低。
In order to study the reason of plasticity deterioration of high strength and low alloy steel for construction at high temperature and low strain rate, the change of shrinkage of 304 and 446 stainless steel at different strain rates with temperature was analyzed. The critical time of P atom in steel was calculated, Time and quantify the effect of strain rate on the thermoplastic properties of both steels. The results show that the segregation of solute atoms at the non-equilibrium grain boundaries is the cause of the poor ductility of 304 and 446 stainless steels, and the segregation degree is the largest at 850 and 800 ℃, respectively. In the segregation phase, the degree of segregation of steel increases, plasticity decreases.