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利用高能脉冲精密冷补技术(LHPPR)在Cr12MoV钢基体焊接M2丝材,研究脉冲电流,脉冲宽度对焊层截面的形貌,组织硬度的影响。结果表明,随着脉冲电流的增大,堆积宽度增大,堆积高度有少许降低;随着脉冲宽度的增加,堆积宽度高度随之增加。焊层组织为典型凝固组织,随着能量的增高,晶粒会长大,焊层和基体呈冶金结合,结合界面无裂纹孔隙等缺陷,热影响区由表面向基体组织由马氏体向马氏体+回火索氏体转变。焊层显微硬度达700~850 HV,远高于300 HV左右的基体。
The effect of pulse current and pulse width on the morphology and hardness of the cross section of the welding layer was studied by using high energy pulsed precision cold-fill technique (LHPPR) to weld M2 wire on Cr12MoV steel substrate. The results show that with the increase of pulse current, the stacking width increases and the stacking height slightly decreases. As the pulse width increases, the stacking height increases. The microstructure of the weld layer is a typical solidified structure. As the energy increases, the grains grow up, the weld layer and the substrate are metallurgically bonded, and the interface is free of cracks and cracks and other defects. The HAZ changes from the surface to the matrix structure from martensite to horse Body + tempered sorbite transformation. The microhardness of the weld layer is 700 ~ 850 HV, which is much higher than the matrix around 300 HV.