正火热处理改善Q345R钢板心部探伤不合缺陷的原因分析  

On Normalizing Heat Treatment to Improve Internal Inspection Defect of Q345R Plate Core

作　　者：赵军 杨艳 邢银超 徐优春 苏俊杰 ZHAO Jun;YANG Yan;XING Yinchao;XU Youchun;SU Junjie(Xiangtan Iron and Steel Group Co.,Ltd.,Xiangtan 411101,China)

机构地区：[1]湘潭钢铁集团有限公司,湖南湘潭411101

出　　处：《金属材料与冶金工程》2023年第5期23-25,31,共4页Metal Materials and Metallurgy Engineering

摘　　要：本文通过选取适当的探伤缺陷材料,在同等条件下进行超声波探伤,定位相同的内部质量缺陷,进行金相显微组织分析,以及正火热处理奥氏体化加热改善处理。试验结果表明,热处理能够改善内部探伤质量,探伤缺陷材料在热处理后能够判定合格。判定合格的材料并不是微观裂纹完全消失了,而是微裂纹变短或弱化,数量级降低。长度由100~150μm减弱至50~80μm。再者,就是原轧态组织连续的长条微裂纹退化为断续的、孤立的孤岛型微裂纹。In this paper,appropriate flaw detection materials were selected,ultrasonic flaw detection was carried out under the same conditions to locate the same internal quality defects.After that,metallographic microanalysis,normalizing treatment and austenitized heating were done for improvement.The results show that heat treatment can improve the quality of internal flaw detection.After heat treatment,it can be judged to be qualified.It is not that the crack completely disappears,but that the crack becomes shorter or weaker,and the order of magnitude is reduced.The length is reduced from 100~150μm to 50~80μm.In addition,the continuous micro-cracks in the original rolled structure degenerated into discrete isolated micro-cracks.

关 键 词：正火热处理 心部裂纹 探伤不合 

分 类 号：TG162.83[金属学及工艺—热处理]