作　　者： ; ; ; ;

机构地区： 东北大学材料与冶金学院轧制技术及连轧自动化国家重点实验室

出　　处： 《东北大学学报（自然科学版）》 2010年第3期385-388,410,共5页

摘　　要： 针对X100管线钢中出现的的异常偏析带,利用金相显微镜、扫描电镜及其EDS系统等进行了组织观察、线扫描成分分析以及拉伸、冲击断口的观察和夹杂物分析.分析结果表明,该偏析带组织为多边形铁素体,且出现晶粒大小不一的混晶现象,与周围板条状贝氏体基体之间差别较大;偏析带的碳含量偏低,锰、硅及氧含量偏高,在拉伸及冲击断口的厚度中心及一侧的1/4处均有分层现象,在冲击断口1/4处观察到夹杂物带,部分夹杂物呈片状,严重恶化了试验钢的冲击韧性. Metalloscope,SEM and EDS（energy density spectrum）were used for the abnormal segregation band of X100 pipeline steel to observe its structure and analyze the composition linearly scanned fracture due to tension/impact and inclusions.The results indicated that the microstructure of the segregation band is polygonal ferrite with mixed crystal of which the sizes of some grains are different from each other,and the microstructure is greatly different from the matrix microstructure which is mainly the lath bainite.In the segregation band the carbon content is relatively low,while the manganese,silicon and oxygen contents are all relatively high.The layered fracture due to tension/impact is found around the center or at the quarter of the sectional thickness of the fracture,and an inclusion band is observed at the quarter of the whole thickness of impact fracture,where part of some inclusions are flaky.The impact toughness of specimens is thus seriously deteriorates.

关 键 词： 管线钢 偏析带 夹杂物 断口分层 线扫描

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]