Study on Tempering Embrittlement of Heat-resistant 07Cr12NiMoVNb Steel
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摘要: 通过冲击试验和断口形貌分析确定07Cr12NiMoVNb耐热钢有回火脆性,并存在二个回火脆性温度区间(450～525℃和575～625℃)。低温回火脆性到高温回火脆性区间的断口形貌从准解理+解理到解理+沿晶断裂,出现沿晶断裂时,冲击值最低。为方便工程上判断是否出现回火脆性,借用了韧/脆转变的(FATT50)概念。Abstract: The tempering embrittlement of 07Cr12NiMoVNb steel is examined through impact test and electron scanning fractographic analysis.It is revealed that two embrittlement temperature ranges,450～525℃ and 575～625℃ exist in the tempering of the steel.The fracture morphology manifesfs that the fracture mechanism changes from quasi-cleavage plus cleavage to cleavage plus intergranular as the tempering temperature rising and the impact toughness of the samples corresponding to intergranular fracture is the lowest.The concept of toughness-brittleness transition,that is FATT50,is adopted for the estimation of tempering temperature in engineering.
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Keywords:
- Heat-resistant stell /
- Tempering embrittlement /
- Fracture morphology
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