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本文定量地研究了具有网状残留奥氏体淬火钢及硬质合金的断裂韧性,残留奥氏体及马氏体形态对断裂韧性的影响,以及网状残留奥氏体影响断裂韧性的条件。分析结果表明,高温淬火的AISI 4340钢(还可能有20SiMn2MoVA低碳马氏体钢)的网状残留奥氏体必具有TRIP性质,它提高断裂韧性的作用比马氏体形态改变的作用至少高约四倍。快速加热淬火的Cr12钢的网状残留奥氏体,即使不具有TRIP性质,也能提高断裂韧性(若具TRIP性质,则提高更多)。硬质合金的断裂韧性只取决于粘结软相的断裂韧性、大小及厚度。对钢结硬质合金而言,若适当控制钢结相成分及淬火参数,从而获得具有TRIP性质的网状残留奥氏体时,将会提高它的断裂韧性。
In this paper, the effects of fracture toughness, retained austenite and martensite morphology on the fracture toughness and the effect of reticular retained austenite on the fracture toughness were investigated quantitatively with the reticulated residual austenite hardened steel and cemented carbide. The results show that the reticular retained austenite of AISI 4340 steel (and possibly 20SiMn2MoVA low-carbon martensitic steel) hardened at high temperature must have TRIP properties and its effect of increasing fracture toughness is at least as high as that of martensite modification About four times. Retained retained austenite in rapidly hardened Cr12 steel improves fracture toughness (even more if TRIP properties), even without TRIP properties. Fracture toughness of cemented carbide only depends on the fracture toughness, size and thickness of the bonded soft phase. For steel cemented carbide, if proper control of the composition and quenching parameters of the steel composition to obtain reticular retained austenite with TRIP properties, will improve its fracture toughness.