减速机盖板法兰高温合金螺栓失效分析  

Failure analysis of superalloy bolts for reducer cover plate

作　　者：敬东 Jing Dong(Gansu Province Special Equipment Inspection and Testing Institute,Lanzhou Gansu 730050,China)

机构地区：[1]甘肃省特种设备检验检测研究院,甘肃兰州730050

出　　处：《金属热处理》2023年第8期291-294,共4页Heat Treatment of Metals

摘　　要：在非正常寿命周期内,某公司减速机盖板出现了压盖法兰镍基合金螺栓断裂事故。经过尺寸测量和受力变形分析,确认了螺栓断裂的先后顺序。进一步对首断件进行理化分析确认,螺栓的断裂呈脆性断裂,与制造过程中热处理不当,组织存在大量回复再结晶不完全的纤维组织有关。During the abnormal life cycle of the butterfly valve equipped in the dehydrogenation unit of a company,the nickel-base alloy bolts of the blind flange were broken.Through dimension measurement and stress deformation analysis,the fracture sequence of bolts was confirmed.Further physical and chemical analysis on the first broken piece confirms that the bolt fracture is brittle type,which is related to improper heat treatment in the manufacturing process,thus a large number of fibre structures without complete recovery and recrystallization are resulted.

关 键 词：高温合金 螺栓 首断件 脆性断裂 纤维组织 

分 类 号：TG157[金属学及工艺—热处理]