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通过OM、TEM、XRD和电子拉力试验机,研究等温淬火对H13钢的显微组织与弯曲性能的影响。结果表明:H13钢经淬火后可以获得合金主要由贝氏体、贝氏体/马氏体、少量的马氏体和残留奥氏体组成的混合组织。在淬火过程中,合金组织中优先析出(Cr,Fe)_(23)C_6和(Cr,Fe)_3C两种类型的碳化物,影响奥氏体的稳定性,转变为贝氏体、贝氏体/马氏体、少量的马氏体。随着淬火时间的延长,合金的弯曲强度和塑性均有所提高,抗弯强度在淬火时间为60min时达到本试验的最大值3286MPa。合金断口由沿晶断裂转变为穿晶解理断裂。
The effects of austempering on the microstructure and bending properties of H13 steel were investigated by OM, TEM, XRD and electronic tensile testing machine. The results show that the mixed microstructure of H13 steel after quenching can be obtained mainly by bainite, bainite / martensite, a small amount of martensite and retained austenite. During the quenching process, two types of (Cr, Fe) _ (23) C_6 and (Cr, Fe) _3C carbides are preferentially precipitated in the alloy microstructure, affecting the stability of austenite and changing into bainite, Body / martensite, a small amount of martensite. With the extension of quenching time, the flexural strength and plasticity of the alloy all increase, and the flexural strength reaches the maximum value of 3286MPa when the quenching time is 60min. The fracture of the alloy transforms from intergranular fracture to transgranular cleavage fracture.