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Shear band and α'-martensite induced by stress in laser melting carbide-free bainite layer

机译：激光熔化无碳化贝氏体层中应力引起的剪切带和α'马氏体

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摘要

By means of laser melting and following isothermal transformation (LMFIT), the shear band and alpha'-martensite in mid-carbon alloy steel layer induced by stress were analyzed. The residual stress, microstructures and nanohardness were analyzed by X-ray stress analyser, X-ray diffraction (XRD), transmission electron microscopy (TEM) and nanoindentation. The results indicate that the carbide-free baninte layers with high hardness are formed on the surface of mid-carbon and high-carbon alloy steels. By LMFIT, the hardness of mid-carbon alloy steel layer can be increased by the carbon supersaturation in bainite ferrite (BF). Meanwhile, shear band and alpha'-martensite can be induced by thermal stress in mid-carbon alloy steel layer to further improve the hardness. The gradient change of residual stress in the bainite layer leads to that of the nanohardness in bainite layer.
机译：通过激光熔化和等温转变（LMFIT），分析了应力引起的中碳合金钢层的剪切带和α'马氏体。通过X射线应力分析仪，X射线衍射（XRD），透射电子显微镜（TEM）和纳米压痕分析残余应力，显微组织和纳米硬度。结果表明，在中碳和高碳合金钢表面形成了高硬度的无碳化物的贝氏体层。通过LMFIT，贝氏体铁素体（BF）中的碳过饱和可以提高中碳合金钢层的硬度。同时，中碳合金钢层中的热应力会引起剪切带和α'马氏体，从而进一步提高硬度。贝氏体层中残余应力的梯度变化导致贝氏体层中纳米硬度的梯度变化。

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