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采用力学试验机、光学显微镜及透射电镜研究了轧后不同冷却工艺对不同Mo含量的无碳化物贝氏体马氏体复相钢组织与性能的影响。结果表明,空冷条件下,不同Mo含量钢均获得了包含贝氏体铁素体、少量先共析铁素体和微量马氏体的组织,随Mo含量提高,强硬度及冲击性能显著提高,Mo在钢中抑制先共析铁素体析出、细化晶粒作用显著。对试验钢轧后施加2.5℃/s冷却,其组织为极细贝氏体铁素体片和交替分布的不连续残留奥氏体薄膜、细小M-A岛以及少量孪晶马氏体,且无论钢中Mo含量高低,均获得了更高的强硬度及适中的韧塑性,综合性能良好。
The effects of different cooling processes on microstructure and properties of carbides-free bainite martensite duplex steel with different Mo content were studied by mechanical testing machine, optical microscope and transmission electron microscope. The results show that microstructure including bainitic ferrite, a small amount of proeutectoid ferrite and a small amount of martensite are obtained under different air cooling conditions. With the increase of Mo content, the hardness and impact properties of the steels are significantly increased, Mo inhibits the precipitation of pro-eutectoid ferrite in steel, refining the grain effect significantly. The test steel after the application of 2.5 ℃ / s cooling, the organization of fine bainitic ferrite sheet and the alternating distribution of discontinuous retained austenite film, fine MA island and a small amount of twin martensite, and regardless of steel Mo content in the high and low, have received a higher hardness and moderate toughness, good overall performance.