Stress rupture properties and microstructure characteristic of C-HRA-3 heat-resistant alloy at 850 ℃

doi:10.13251/j.issn.0254-6051.2020.01.027

Abstract

Abstract: The carbide characteristics of C-HRA-3 heat-resistant alloy during the creep rupture test at 850 ℃ were studied. The results show that when the stress is 120 MPa, the rupture time is 37.8 h. The main precipitated phases are M ₂₃ C ₆ and Ti (C, N) phase. Under high stress condition, M ₂₃ C ₆ phase precipitates along the deformation zone. When the stress is 80 MPa, the rupture time is prolonged to 491 h, the Ti (C, N) in inter-granular grows and coarsens, and the M ₂₃ C ₆ phase at the grain boundary partially dissolves, resulting in the indistinct grain boundary characteristics and the re-precipitation of the fine M ₂₃ C ₆ phase. The fracture modes of specimens under different stress condition are inter-granular fracture, and the crack source preferentially sprouts around the larger precipitates (M ₂₃ C ₆ and Ti (C, N) ), resulting in the decrease of the elongation of the rupture section with the extension of the rupture time.

Key words: C-HRA-3 heat-resistant alloy, creep rupture test, carbide

CLC Number:

TG156.94

Chen Zhengzong, Liu Zhengdong, Dong Chen, Bao Hansheng, Zhang Peng, Han Kui, Gao Pei. Stress rupture properties and microstructure characteristic of C-HRA-3 heat-resistant alloy at 850 ℃[J]. HTM, 2020, 45(1): 135-138.

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