热处理态X80钢韧性不均匀问题分析  

Analysis on Uneven Toughness Problem of Heat-treated X80 Steel

作　　者：牛靖[1] 周海斌 魏可嘉 程俊 王鹏[2] 黄铎 刘迎来 NIU Jing;ZHOU Haibin;WEI Kejia;CHEN Jun;WANG Peng;HUANG Duo;LIU Yinglai(State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an 710049,China;CNPC Tubular Goods Research Institute,Xi'an 710077,China)

机构地区：[1]西安交通大学金属材料强度国家重点实验室,陕西西安710049 [2]中国石油集团工程材料研究院有限公司,陕西西安710077

出　　处：《热加工工艺》2025年第6期38-41,47,共5页Hot Working Technology

基　　金：十三五装备预研共用技术项目(41421080302)。

摘　　要：为了解决热处理态X80管线钢韧性不均匀问题,选择典型冲击试样进行了断口分析、微观组织及背散射电子衍射分析。结果表明,微观组织不均匀性,存在大块状准多边形铁素体,导致大角度晶界含量低,有效晶粒尺寸大且均匀性差,是热处理态X80钢部分冲击试样发生解理脆断的根本原因。设法获得细小的准多边形铁素体可以提高X80中的大角度晶界含量,细化有效晶粒尺寸,可以兼顾热处理态X80钢的强韧性。In order to solve the problem of uneven toughness of heat-treated X80 steel,fracture analysis,microstructure analysis and backscattered electron diffraction analysis of typical impact samples were carried out.The results show that the non-uniformity of microstructure and the existence of large massive quasi-polygonal ferrite lead to the low content of large grain boundaries,large effective grain size and poor uniformity,which are the fundamental reasons for the cleavage brittle fracture of the impact sample of the heat-treated X80 steel.To obtain fine quasi-polygonal ferrite can increase the relative content of large grain boundary in X80,refine the effective grain size,and guarantee the strength and toughness of heat-treated X80 steel.

关 键 词：X80管线钢 冲击韧性 背散射电子衍射 有效晶粒尺寸 

分 类 号：TG157[金属学及工艺—热处理]