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首页> 外文期刊>Journal of Materials Engineering and Performance >Tempered Martensite Embrittlement in a 32NiCrMoV125 Steel
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Tempered Martensite Embrittlement in a 32NiCrMoV125 Steel

机译：32NiCrMoV125钢中的回火马氏体脆化

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摘要

This study focused on tempered martensite embrittlement in a 32NiCrMoV125 steel through examination of the effects of austenite grain size and tempering temperature on the mechanical properties and fracture morphology of this material. Two different austenite grain sizes were obtained by austenitizing at 870 and 950 deg C. After quenching, the specimens were tempered in the temperature range of 200-650 deg C. The results obtained in this research indicate that by increasing the tempering temperature, the strength and hardness decrease, but ductility increases. However, impact testing indicated that tempered martensite embrittlement occurred when samples were tempered in the range of 250-400 deg C. Fractography revealed inter-granular and quasi-cleavage fracture. In summary, increasing the austenite grain size decreased strength, but increased impact toughness, except for samples tempered between 200 and 350 deg C.
机译：通过研究奥氏体晶粒尺寸和回火温度对该材料的力学性能和断裂形态的影响，本研究集中于32NiCrMoV125钢中的回火马氏体脆化。通过在870和950摄氏度下进行奥氏体化获得两种不同的奥氏体晶粒尺寸。淬火后，在200-650摄氏度的温度范围内对试样进行回火。本研究的结果表明，通过提高回火温度可以提高强度和硬度降低，但延展性提高。然而，冲击试验表明，当样品在250-400℃范围内回火时，会发生回火马氏体脆化。分形图显示出晶间和准裂解断裂。总之，增加奥氏体晶粒尺寸会降低强度，但会增加冲击韧性，但在200至350摄氏度之间回火的样品除外。

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