MnS夹杂物引起16Mn锻件白点缺陷的原因分析  

Caused Analysis of White Spot Defect by MnS Inclusions in 16Mn Forgings

作　　者：师虎军 史伟 杨莉 石永祥 王丽娜 SHI Hu-jun;SHI Wei;YANG Li;SHI Yong-xiang;WANG Li-na(Lanzhou LS Group Co.,Ltd.,Casting and Forging Branch,Lanzhou Gansu 730314,China;Lanzhou LS Test Technology Co.,Ltd.,Lanzhou Gansu 730314,China;Gansu Engineering Research Center of Mechanical Equipment Material Standard and Safety Evaluation,Lanzhou Gansu 730314,China;Lanzhou Lanshi Heavy Equipment Co.,Ltd.,Lanzhou Gansu 730314,China;School of Materials Science and Engineering,Lanzhou Jiaotong University,Lanzhou Gansu 730070,China)

机构地区：[1]兰州兰石集团有限公司铸锻分公司,甘肃兰州730314 [2]兰州兰石检测技术有限公司,甘肃兰州730314 [3]甘肃省机械装备材料表征与安全评价工程研究中心,甘肃兰州730314 [4]兰州兰石重型装备股份有限公司,甘肃兰州730314 [5]兰州交通大学材料科学与工程学院,甘肃兰州730070

出　　处：《热处理技术与装备》2023年第1期43-46,共4页Heat Treatment Technology and Equipment

摘　　要：白点缺陷在钢材中是一种非常致命的缺陷,需严格控制其产生。通过化学成分、显微组织、能谱分析等手段,对硫、氢元素含量符合要求的16Mn锻件中产生密集型缺陷的原因进行分析,发现产生的密集型缺陷为白点。其产生的原因在于MnS夹杂物的存在,导致氢原子在尖端聚集,造成应力集中,最终萌生裂纹,形成白点缺陷。可通过对铸坯偏析的改善、凝固过程控制等手段来控制MnS夹杂物的形核和长大,使S和Mn元素更多地以固溶原子的形式存在,或者形成的MnS夹杂物尺寸细小、均匀弥散地分布在钢中,避免白点缺陷的产生。As a fatal defect in steel, white spot defects should be strictly controlled. The causes of dense defects in 16Mn forgings with sulfur and hydrogen content in line with the requirements were analyzed by means of chemical composition, microstructure and energy spectrum analysis. It was found that the dense defects were white spots. The white spot was caused by the existence of MnS inclusions, which led to the accumulation of hydrogen atoms at the tip, resulting in stress concentration, and finally cracks were initiated and white spot defects were formed. The nucleation and growth of MnS inclusions could be controlled by means of improving the segregation of casting billet and controlling the solidification process, so that more S and Mn elements existed in the form of solid solution atoms, or the formed MnS inclusions were fine in size and uniformly distributed in the steel, so as to avoid the occurrence of white spot defects.

关 键 词：白点 硫化锰 冷却速度 浇铸温度 

分 类 号：TG115[金属学及工艺—物理冶金]