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通过对GJW50合金（配料成分为wt％：50WC、0．25C、0.50Cr、0．25Mo，余量为Fe）1020℃＋200℃等温淬火态与1020℃淬火＋200℃回火态组织形态与断口形貌的观察、残余奥氏体量与力学性能的测定，探讨了等温马氏作的形成机制，并研究了马氏体等温淬火对该合金强韧性的影响。结果表明，在200℃等温过程中剩余奥氏作中先析出ε碳化物，尔后形成细晶马氏体。1020℃＋200℃等温淬火态的残余奥氏作量显著多于1020℃淬火＋200℃回火态；前者的HRC，σbb与ak值均高于后者，但kIC值略低于后者。
The microstructure and fracture morphology of GJW50 alloy quenched at 1020 ℃ + 200 ℃ and quenched at 1020 ℃ + 200 ℃ were studied by comparing the microstructure of GJW50 alloy (wt%: 50WC, 0.25C, 0.50Cr, 0.25Mo, balance Fe) Appearance observation, residual austenite content and mechanical properties were investigated. The formation mechanism of isothermal Mach number was discussed. The effect of martensite isothermal quenching on the toughness of the alloy was also studied. The results show that ε carbide precipitates first in the remaining austenite during the isothermal process at 200 ℃, and then forms fine-grained martensite. The residual austenite yield at isothermal quenching at 1020 ℃ + 200 ℃ was significantly higher than that at 1020 ℃ quenching + 200 ℃ tempering. The former HRC, σbb and ak values were higher than the latter, but the kIC value was slightly lower than the latter.