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首页> 外文期刊>Applied Surface Science >Dissimilar autogenous full penetration welding of superalloy K418 and 42CrMo steel by a high power CW Nd:YAG laser
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Dissimilar autogenous full penetration welding of superalloy K418 and 42CrMo steel by a high power CW Nd:YAG laser

机译：高功率连续Nd：YAG激光对K418和42CrMo合金钢进行的自相似全熔透焊

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摘要

Experiments of autogenous laser full penetration welding between dissimilar cast Ni-based superalloy K418 and alloy steel 42CrMo flat plates with 3.5 mm thickness were conducted using a 3 kW continuous wave (CW) Nd:YAG laser. The influences of laser welding velocity, flow rate of side-blow shielding gas, defocusing distance were investigated. Microstructure of the welded seam was characterized by optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). Mechanical properties of the welded seam were evaluated by microhardness and tensile strength testing. Results show that high quality full penetration laser-welded joint can be obtained by optimizing the welding velocity, flow rate of shielding gas and defocusing distance. The laser-welded seam have non-equilibrium solidified microstructures consisting of γ-FeCr_(0.29)Ni_(0.16)C_(0.06) austenite solid solution dendrites as the dominant and very small amount of super-fine dispersed Ni_3Al γ' phase and Laves particles as well as MC needle-like carbides distributed in the interdendritic regions. Although the microhardness of the laser-welded seam was lower than that of the base metal, the strength of the joint was equal to that of the base metal and the fracture mechanism showed fine ductility.
机译：使用3 kW连续波（CW）Nd：YAG激光器进行了异种铸造Ni基高温合金K418与厚度为3.5 mm的合金钢42CrMo平板之间的自发激光全熔透焊接实验。研究了激光焊接速度，侧吹保护气流量，离焦距离的影响。通过光学显微镜（OM），扫描电子显微镜（SEM）和X射线衍射（XRD）和能量分散光谱仪（EDS）对焊缝的微观结构进行了表征。通过显微硬度和抗拉强度测试评估了焊缝的机械性能。结果表明，通过优化焊接速度，保护气体流量和散焦距离，可以获得高质量的全焊透激光焊接接头。激光焊缝具有由γ-FeCr_（0.29）Ni_（0.16）C_（0.06）奥氏体固溶体组成的非平衡凝固组织，该固溶体以占主导地位且少量的超细分散Ni_3Alγ'相和Laves颗粒的树枝状出现。以及分布在树突间区域的MC针状碳化物。尽管激光焊接接缝的显微硬度低于母材的显微硬度，但接头的强度却等于母材的强度，并且断裂机理显示出良好的延展性。

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