马氏体不锈钢大拘束度结构焊接裂纹及防止措施

Weld Cracks and Prevention Measures of Martensitic Stainless Steel with High Contraint Degree

马氏体不锈钢常温组织为硬脆的马氏体组织,它的导热性较碳钢差,焊接残余应力较大,使得在焊后冷却时容易产生裂纹。从力学、金属学两方面分析了产生裂纹的原因,并通过更改焊接材料、优化焊接参数等解决了约束型马氏体不锈钢产生焊接裂纹的问题。

Martensitic stainless steel has crisp-hard martensite structure at room temperature, and has less thermal conductance than carbon steel, so there is high residual stress in welding heat-affected zone and the welded parts ofen engender cracks during cooling down. In the paper, the causes of cracks were analyzed form mechanics and metallography. The crack problem of martensitic stainless steel was solved by changing the weld material and optimizing the weld parameters.