【摘要】 采用硬度试验、示波冲击试验、SEM断口分析、金相组织分析等,对电厂服役一年的T91/10CrMo910焊接接头的冲击韧性进行了分析。结果表明:焊缝区为准解理型脆性破断;10CrMo910热影响区和T91热影响区为微孔聚合韧窝型韧性破断。焊缝区组织为粗大的板条马氏体,并且焊后回火不充分,韧性差;10CrMo910热影响区和T91热影响区的组织分别为索氏体和细的回火马氏体,韧性较好。示波冲击曲线与断口形貌和硬度以及组织有良好的对应关系,是韧性分析的有效方法之一。更多还原

【Abstract】 The impact toughness of T91/10CrMo910 weld joints served in a power station for one year was analyzed by hardness testing, Oscilloscope Charpy impact testing, SEM fracture and metallographic structure analysis. The results show that the fracture in the weld joint is quasi-cleavage brittle fracture and the fracture in heat-affected is microvoid coalescence gliding fracture. The microstructure of the weld seam shows the big lath martensite, and the toughness of the weld seam is poor because of insufficient temper after welding. The microstructures of heat affected zones of T91/10CrMo910 are tempered sorbite and thin tempered lath martensite and the toughness is good. Oscilloscope Charpy impact curve corresponds well with fractographic characteristic, hardness curve and the microstructures, therefore is the effective toughness analyzing method.更多还原