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研究了升温进入两相区淬火与奥氏体化后降温进入两相区淬火对960 MPa级调质型超高强钢组织性能的影响。结果表明:升温淬火工艺获得板条马氏体+针状铁素体组织,随着两相区淬火温度从800℃升高至850℃,强度提高,冲击性能变化较小;降温淬火工艺获得板条马氏体+多边形铁素体组织,随着两相区淬火温度从750℃降低至650℃,强度和冲击性能基本上保持不变。与常规QT工艺相比,试验钢升温和降温进入两相区淬火工艺后的强度均略有降低,但冲击性能均明显改善,其中降温淬火工艺冲击性能的改善更为明显。
The effect of quenching after entering into two-phase zone and quenching after austenitizing into two-phase zone on the microstructure and properties of 960 MPa quenched and tempered ultra-high strength steel was studied. The results show that martensite and acicular ferrite microstructure are obtained by heating and quenching process. With the quenching temperature increasing from 800 ℃ to 850 ℃, the strength increases and the impact performance changes little. Martensite + polygonal ferrite, with the two-phase quenching temperature from 750 ℃ to 650 ℃, the strength and impact properties remain essentially unchanged. Compared with the conventional QT process, the strength of test steel after heating and cooling into the two-phase quenching process slightly decreased, but the impact performance were significantly improved, of which the impact of cooling quenching process to improve the performance even more pronounced.