通过室温、高温拉伸、Gleeble热模拟试验,光学显微镜(OM)及高分辨透射电镜(HR-TEM)观察,研究了中温低合金(Cr-Mo、Cr-Mo+微合金)耐热钢的拉伸、蠕变行为及其微观机理.结果表明,高温270℃下,低合金耐热钢拉伸应力-应变曲线的屈服平台消失,形成连续光滑的应变强化曲线.相比于C-Mn钢,低合金耐热钢的高温强度明显升高.高温350℃下,相比于C-Mn钢,低合金耐热钢的蠕变速率明显降低,其中Cr-Mo+微合金钢的蠕变速率最小.微合金元素形成的强碳化物抑制了Cr、Mo合金元素从基体中析出,Cr-Mo+微合金钢的蠕变抗力得到提高.
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