采用Gleeble-3500热模拟试验机研究了Cu-P-Cr-Ni-Mo耐候钢在变形温度700～950℃、变形量70％、应变速率0.01 ～10 s-1条件下的热变形行为及其热变形的组织演变规律.结果表明,Cu-P-Cr-Ni-Mo耐候钢在700 ～950℃变形时,峰值应力在低于750℃,高于850℃时随变形温度的升高而降低,而在750～850℃之间随温度升高先降低后升高,在800℃出现极小值.在应变速率和变形量不变的情况下,随着变形温度的降低,组织的细化机制由奥氏体的再结晶细化向铁素体的回复再结晶细化转化,并且铁素体的回复再结晶细化效果更加显著.Cu-P-Cr-Ni-Mo耐候钢在应变速率为1 s-1,变形量为70％的变形条件下,变形温度为775℃时获得的组织细小均匀,铁素体晶粒的平均尺寸约为3 μm.
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