Creep rupture property at 550 ℃ and microstructure evolution of 316H stainless steel forging for generation IV reactor

doi:10.13251/j.issn.0254-6051.2025.02.003

Abstract

Abstract: Creep rupture strength of 316H stainless steel forging was tested by rupture test machines at 550 ℃, and the fracture morphology and microstructure of the fracture specimens were analyzed by optical electron microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). The results indicate that the 316H stainless steel forging has high creep rupture strength at 550 ℃, the creep rupture stress after 10 000 h determined through the isothermal extrapolation method is 314 MPa, which significantly exceeds the ASME design criteria. The fracture morphology of the 316H stainless steel forging consists of both dimple and intergranular fracture patterns. As the fracture duration increases, the proportion of intergranular fracture progressively rises, and the origin of the fractures transitions from non-metallic inclusions into second-phase particles at the grain boundaries. The 316H steel forging displays good structural stability throughout the 550 ℃ rupture test. As the applied stress reduces and fracture duration extends, the grain size progressively increases, the grain boundary area diminishes, and only a small amount of M₂₃C₆ and σ phases are precipitated at the grain boundaries

Key words: generation IV reactor, 316H stainless steel forging, creep rupture strength, M₂₃C₆ phase, σ phase

CLC Number:

TG115.2

Zhang Zhifeng, Zhao Jiqing, Wang Xiaofang, Wang Yunhai, Yang Gang. Creep rupture property at 550 ℃ and microstructure evolution of 316H stainless steel forging for generation IV reactor[J]. Heat Treatment of Metals, 2025, 50(2): 15-22.

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