装甲钢低相变点马氏体焊缝金属韧性劣化及其控制  

Toughness Deterioration and Its Control of Martensitic Weld Metal with Low Transformation Point in Armor Steel

作　　者：孙咸[1] SUN Xian(Institute of Welding Consumables,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学焊接材料研究所,太原030024

出　　处：《焊管》2024年第8期9-18,共10页Welded Pipe and Tube

摘　　要：综述了装甲钢低相变点马氏体焊缝金属韧性劣化及其控制。结果表明,低相变点马氏体焊缝金属常温冲击韧性低于母材的韧性劣化或韧性不稳定现象,与不同焊接方法所形成的马氏体焊缝显微组织及其含氧量的差异密切相关。降低焊缝马氏体相变温度的相关化学元素和成分含量在一定程度上有利于改善焊缝韧性,但焊缝化学成分并不是影响焊缝韧性的唯一因素。GTAW试样比GMAW试样焊缝冲击韧性高,焊缝中的含氧量是焊缝冲击韧性提高的内在因素。以形成低相变点马氏体组织为目标焊缝化学成分的控制和以焊缝中氧含量极低焊接方法的选用原则,是控制装甲钢焊缝韧性的有效途径。The toughness deterioration and its control of martensitic weld metal with low transformation point in armor steel were reviewed.The results show that the deterioration or instability that toughness of martensite weld metal with low transformation point at room temperature is lower than that of base metal,which is closely related to the difference of martensite weld microstructure and oxygen content formed by different welding methods.Reducing the chemical elements and compositions related to the martensitic transformation temperature of the weld is beneficial to improving the weld toughness to a certain extent,but the chemical composition of the weld is not the only factor affecting the weld toughness.The impact toughness of GTAW weld is higher than that of GMAW weld,and the oxygen content in the weld is the internal factor for the increase of impact toughness of the weld.It is an effective way to control the toughness of armor steel weld to control the chemical composition of weld aiming at forming martensite structure with low phase transformation point and the selection principle of welding method with extremely low oxygen content in weld.

关 键 词：韧性 低相变点马氏体焊缝 装甲钢 残余应力 夹杂物 

分 类 号：TG406[金属学及工艺—焊接]