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The effect of isothermal quenching on microstructure and properties of forged and unforged Fe-B cast alloy were investigated in this paper. The prepared samples were analyzed using scanning electron microscope (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The results show that, after isothermal quenching, the matrix transforms into lower bainite, but the morphology of boride remains nearly unchanged compared with its as-cast condition. Compared with water quenching, the hardness of forged and unforged samples after isothermal quenching is lower than the hardness of that after water quenching. The impact toughness of forged and unforged samples after isothermal quenching is higher than after water quenching. In two-body abrasion test, the wear resistance of forged and unforged samples after isothermal quenching is lower than that of forged and unforged samples after water quenching. In three-body abrasion test, the wear resistance of forged and unforged samples after isothermal quenching shows opposite behavior and is higher than that of forged and unforged samples after water quenching.

Effect of isothermal quenching on microstructure and properties of a forged and unforged Fe-B cast alloy