Abstract The change in the structure of welds made with a new welding wire and subjected to high-velocity impact was investigated by optical and scanning electron microscopy and X-ray diffraction analysis. It is shown that after welding, a structure consisting of martensite, $$\delta$$ δ -ferrite, and metastable austenite is formed in the weld metal. The subsequent severe impact leads to hardening of the weld metal due to the transformation of metastable austenite to strain-induced martensite. Kinetic microindentation of the weld was performed.

中文翻译：

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高速冲击下焊缝金属的相变和结构转变

摘要 通过光学、扫描电子显微镜和X射线衍射分析，研究了新型焊丝在高速冲击下焊缝结构的变化。结果表明，焊接后在焊缝金属中形成了由马氏体、$$\delta$$ δ-铁素体和亚稳态奥氏体组成的组织。由于亚稳态奥氏体转变为应变诱发马氏体，随后的严重冲击导致焊缝金属硬化。对焊缝进行动力学显微压痕。