Microstructure, Impact Toughness and TEM Analysis in the CGHAZ of HQ130 High Strength Steel

查看全文 作　　者：Zou, [1]ZD;Li, [1]YJ;Yin, [1]SK 机构地区：[1]Shandong Univ Technol, Jinan 250061, Peoples R China 出　　处：《Journal of Materials Science & Technology》索引1999年第15卷第6期,共4页 摘　　要：Microstructure and impact toughness in the coarse grain heat-affected zone (CGHAZ) of HQ130 high strength steel were studied by using the weld thermo-simulation test. Fracture morphology and fine structure in the CGHAZ were analyzed by means of SEM, TEM and electron diffraction.Experimental results indicated that the impact toughness and hardness in the CGHAZ (Tm =1350℃) decreased with increasing cooling time (t8/5), and fracture morphology changed from dimple fracture into cleavage fracture. The reason for the toughness decrease is the formation of upper bainite. During application, the welding heat input should be strictly limited, to reduce brittleness in the CGHAZ of HQ130 steel. 关 键 词：MICROSTRUCTURE TEM Impact Toughness and TEM Analysis in the CGHAZ of HQ130 High Strength Steel