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Effect of initial martensite and tempered carbide on mechanical properties of 3Cr2MnNiMo mold steel

机译：初始马氏体和钢化碳化物对3Cr2mnnimo模钢力学性能的影响

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摘要

Effect of initial martensite and tempered carbide characteristics on mechanical properties of 3Cr2MnNiMo mold steel were investigated. The results indicated that the initial martensite microstructure can be effectively adjusted by changing the quenching temperature. With the increase of quenching temperature from 760°C to 1010°C, the initial microstructure gradually changed from acicular ferrite + plate martensite + M_7C_3 carbides to lath martensite, and the grain size increased monotonically. The coarsening of the initial martensite led to the increase of tempered carbide size, and the morphology of tempered carbide gradually changed from spherical to long strip-shaped. The large-size and long strip-shaped carbides promoted the formation of micro-voids during the tensile deformation and significantly decreased the elongation. In addition, with the coarsening of the martensite microstructure, both the decrease of high-angle grain boundaries (HAGB) density and the appearance of long strip-shaped tempered carbides significantly reduced the impact absorbed energy. The fracture mechanism transformed from ductile fracture caused by micro-voids coalescence to intergranular cleavage fracture. Moreover, when the initial microstructure completely transformed into lath martensite, the yield and tensile strength remained approximately unchanged. The precipitation strengthening compensated the adverse effect of martensite coarsening.
机译：研究了初始马氏体和钢化碳化物特性对3Cr2mnnimo模钢力学性能的影响。结果表明，通过改变淬火温度可以有效地调节初始马氏体微观结构。随着淬火温度的增加从760℃至1010℃，初始微观结构从针状铁氧体+板马氏体+ M_7C_3碳化物逐渐变化到Lath Martensite，并且晶粒尺寸单调增加。初始马氏体的粗化导致回火碳化物尺寸的增加，回火碳化物的形态从球形逐渐变为长条状。大尺寸和长的条形碳化物在拉伸变形期间促进了微空隙的形成，并且显着降低了伸长率。另外，随着马氏体微观结构的粗化，高角度晶界（HAGB）密度的降低和长条形钢化碳化物的外观显着降低了吸收能量的冲击。从微空空隙聚结引起的韧性断裂转化为晶间切割骨折的断裂机制。此外，当初始微观结构完全转化成Lath马氏体时，产率和拉伸强度仍然保持不变。沉淀强化补偿马氏体粗化的不利影响。

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