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采用真空感应炉冶炼了试验钢,并用二辊可逆式轧机进行了轧制,分别用空冷、水淬、油淬三种方式冷却,并对水淬后的试验钢进行了不同温度的回火处理,研究了冷却方式及回火对试验钢组织及性能的影响。结果表明,水淬试验钢的强度最高,而冲击功及塑性最差;油淬钢的强度低于水淬,但冲击功最高,空冷钢的强度最低,塑性最高。空冷钢的组织以粒状贝氏体为主,以及不规则铁素体;水淬钢的组织为细小的板条贝氏体+少量粒状贝氏体;油淬钢的组织为细小的板条状贝氏体。回火对试验钢强度的影响不大,对塑性、韧性的影响则比较明显。强度随回火温度提高先略微升高后降低,韧性则先降低后升高。600℃时获得最高强度及较优的塑性和韧性,550℃时发生脆化。
The test steel was smelted by a vacuum induction furnace and rolled by a two-roll reversing mill. The steel was cooled by air cooling, water quenching and oil quenching respectively, and tempering the test steel after water quenching at different temperatures , The effects of cooling method and tempering on microstructure and properties of test steel were studied. The results show that the strength of water quenched steel is the highest, while the impact energy and plasticity are the worst. The strength of oil quenched steel is lower than that of water quenched, but the highest impact energy is obtained. The strength of air-cooled steel is the lowest and the plasticity is the highest. The structure of the air-cooled steel is granular bainite and irregular ferrite. The microstructure of the water-quenched steel is fine lath bainite and a small amount of granular bainite. The structure of oil-quenched steels is fine lath Bainite. Tempering the strength of the test steel has little effect on the plastic, toughness is more obvious. With the increase of tempering temperature, the strength slightly increases and then decreases, while the toughness decreases and then increases. The highest strength and superior ductility and toughness were obtained at 600 ° C and embrittlement at 550 ° C.