进口B70级直缝焊管冷弯试验开裂分析  

Cracking Analysis of Importation B70 Grade Line Welding Pipe in Cold-bend Test

作　　者：朱锦波[1] 傅志强[1] 姚久红[1] 

机构地区：[1]天津出入境检验检疫局,天津300201

出　　处：《理化检验（物理分册）》2009年第6期361-363,共3页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：对在冷弯试验中焊缝开裂的进口B70级直缝焊管进行了金相检验、焊缝断口形貌分析以及夹杂物成分分析。结果表明:焊缝中分布在铁素体晶界上的渗碳体以及焊缝中存在的夹杂物和气孔是导致冷弯试验中发生开裂的主要原因。Metallurgical analysis, fracture analysis and chemical composition analysis were carried out on the B70 grade line welding pipe which cracked during the cold bending test. The results showed that network cementite distributing along the boundary of ferrite grains, inclusions and gas porosities caused the cracking of pipe during the cold bending test.

关 键 词：夹杂物 气孔 渗碳体 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]