20CrlMolVTiB螺栓断裂原因分析  

Fracture Failure Analysis of 20CrlMolVTiB Bolt

作　　者：孙澎[1] 

机构地区：[1]国网河北省电力公司电力科学研究院,河北石家庄050021

出　　处：《热加工工艺》2016年第4期252-254,共3页Hot Working Technology

摘　　要：通过宏观分析、化学成分分析、金相组织检验、力学性能分析、扫描电镜断口分析,对某电厂汽轮发电机20Crl Mol VTi B螺栓的断裂原因进行了综合分析。结果表明,该螺栓断裂的根本原因是螺栓加工过程中不当的热处理工艺造成螺栓存在粗晶组织,材料冲击性能下降,导致螺栓发生脆性断裂。A comprehensive analysis which was based on macro-structure inspection, chemical composition analysis, matellurgical structure, mechanical performance analysis and fracture morphology observation was made on fracture failure of 20CrlMolVTiB bolt of steam turbine. The results show that the improper heat treatment process used in manufacture, causes coarse crystal and incompetent impact toughness, leades bolt to brittle fracture.

关 键 词：20CrlMolVTiB 螺栓 热处理 粗晶 

分 类 号：TG156.7[金属学及工艺—热处理]