Effect of Heat Treatment on Microstructure and Properties of S390 Powder Metallurgy High Speed Steel
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摘要: 研究了不同奥氏体化加热温度和回火温度对S390粉末高速钢组织和力学性能的影响。结果表明: 试样在1 190, 1 230 ℃奥氏体化后经高压(0.6 MPa)真空气淬或油淬均可得到马氏体、残留奥氏体和合金碳化物的组织, 再经三次高温回火后可得到细小合金碳化物、回火马氏体组织; 试样的回火二次硬化现象明显, 1 230 ℃高压真空气淬和油淬试样的二次硬化峰值温度为500 ℃和540 ℃; 试样经优化工艺1 230 ℃油淬+540 ℃×2 h两次回火+510 ℃×2 h一次回火后, 其硬度和抗压强度可达67.0 HRC和3 862 MPa以上。Abstract: The effects of austenitizing and tempering temperature on the microstructure and mechanical properties of powder metallurgy high speed steel (PMHSS) S390 were investigated. The results reveal that the microstructure of martensite, retained austenite and alloy carbide could be obtained in the samples high-pressure vacuum gas quenched (0.6 MPa) and oil quenched after austenitizing at 1 190, 1 230 ℃, the microstructure became fine alloy carbide and tempered martensite after high temperature tempering for three times. Moreover, the secondary hardening effect of S390 steel was obvious, and the peak of secondary hardening was at 500 ℃ and 540 ℃ for samples after high-pressure vacuum gas quenching and oil quenching. The hardness and compressive strength were 67.2 HRC and above 3 862 MPa, when the S390 steel was experienced the optimal process, oil quenching at 1 230 ℃ and two-hour tempering at 540 ℃ twice then at 510 ℃ once.
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