采用X射线衍射分析仪、光学显微镜、扫描电镜、透射电镜及拉伸、弯曲力学性能试验对高温服役4.2万小时超超临界机组用HR3C钢的微观组织与力学性能进行了测试表征.结果表明,高温服役后HR3C钢中形成了CrNbN,M23 C6,Nb(C,N)析出相,受热力学驱动和动力学生长因素影响,各析出相具有不同的数量、形态和分布特征.由于服役过程中形成的析出相的影响,高温服役后HR3C钢塑韧性明显降低,表现时效脆化倾向.
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