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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Cr Nb N,M23C6,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。
The microstructure and mechanical properties of the HR3C steel used in the 42,000-h ultra-supercritical unit at high temperature were characterized by X-ray diffraction analyzer, optical microscope, scanning electron microscopy, transmission electron microscopy and tensile and flexural mechanical properties tests. The results show that the precipitates of Cr Nb N, M23C6 and Nb (C, N) are formed in HR3C steel after service at high temperature. Influenced by the thermodynamics and kinetic growth factors, the precipitates have different quantities, morphologies and distributions. Due to the influence of the precipitated phase formed during service, the toughness of steel and plastic of HR3C after service at high temperature is significantly reduced, indicating the tendency of aging embrittlement.