马氏体不锈钢焊接接头动态断裂韧性的研究

进行了G242焊条的修复焊接接头与母材动态断裂韧性及疲劳寿命的试验，通过分析无任何附加工艺条件的焊缝状态（简称焊态）；焊后对焊缝表面锤击；焊接时对每道焊缝进行锤击；焊后氩弧重熔焊趾；焊接时对每道焊缝进行锤击，且焊后分别进行600℃、650℃、700℃的热处理等工艺条件下焊接接头的性能变化规律，通过扫描电镜、光学金相探明不同工艺条件下焊接接头微观断裂机制及组织性能变化，通过接头硬度测试，测定不同工艺条件下接头硬度分布，以间接反映其组织及强度变化趋势。最终确定了采用马氏体不锈钢焊条施焊时合理的焊接工艺措施及焊后热处理制度。

Study on Dynamic Fracture Toughness of Martensitic Stainless Steel Weld Joint

The variation laws of the weld joint properties were proposed in different technology condi?tions, such as normal weld joint state without any attached technology condition, peening the weld surface at postweld, peening weld joint at welding, remelting weld toe by argon arc at postweld to?gether with peening the weld surface at welding and heat treatment at 600 °C，650 0C and 700 0C at postweia on the basis of the experiments of the repair weld joint with G242 electrod, base metal dy?namic fracture toughness and fatigue life. The weld joint micro-fracture principle and microstructure variations were indicated by scanning electron microscope and optical metallograph. The joint hardness distribution at different technology conditions was measured by Rockwell hardometer, in order to re?flect the microstructure and strength changes indirectly. The reasonable welding methods and postweld heat treatment standard with martensitic electrode were defined.