1Cr11Co3W3NiMoVNbNB耐热钢的焊接冷裂纹敏感性研究

1Cr11Co3W3NiMoVNbNB为日本进口的新型高强度马氏体耐热钢,与传统的12Cr耐热钢相比,W、Co元素含量增至3%,使得该钢具有更好的高温持久强度和抗蠕变性能,但焊接性差。对1Cr11Co3W3NiMoVNbNB耐热钢的焊接性进行分析研究,并分别进行了斜Y型坡口抗裂试验和插销试验。结果表明,随着预热温度的提高,其斜Y型坡口焊接裂纹率逐渐下降,焊前不预热插销试样断口为沿晶+穿晶断裂形貌,当预热温度达到300℃时,断口为韧性断裂形貌。随着预热温度的升高,该材料的焊接冷裂纹敏感性下降。

Research on welding cold crack sensitivity of heat resistant steel 1Cr11Co3W3NiMoVNbNB

1Cr11Co3W3NiMoVNbNB imported from Japan for the new high-strength martensitic heat-resistant steel,compared with the traditional 12Cr heat-resistant steel,W,Co elemental content increased to 3%,making the steel has better high-temperature lasting strength,creep resistance,but the weldability is deteriorated. In this paper,research on the weldability of 1Cr11Co3W3NiMoVNbNB heat-resisting steel,and conducts oblique Y-groove and cold-plug test respectively. The results show that the preheating temperature is increased,the welding crack rate of oblique Y-groove is gradually decreased,and the preheated bolt sample is not preheated to be intergranular and transgranular fracture morphology. When the preheating temperature reaches 300 ℃,the fracture is ductile fracture morphology. As the preheat temperature increases,the material's cold cracking sensitivity decreases.