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采用Gleeble-1500热模拟试验机,建立了10Ni5CrMo钢的连续冷却转变曲线。分析了10Ni5CrMo钢在不同冷却速度下的组织转变规律。结果表明:当冷却速度小于0.2℃/s时,钢中得到粒状贝氏体组织;当冷却速度为0.5℃/s时,组织为粒状贝氏体和下贝氏体;当冷却速度在1～2℃/s时,组织为板条状的马氏体和贝氏体的混合组织;当冷速进一步增大,达到5℃/s时,钢中得到了单一的马氏体组织。为了研究冷却速度对强度和低温韧性的影响,在实验室采用不同冷却方式模拟不同的冷却速度并进行冲击和拉伸试验,试验结果表明:不同冷却方式下钢的强度相差不大,低温冲击韧性有较大提高。对不同冷却方式下的精细结构进行深入分析,马贝混合细化了板条块及板条束。研究认为适当比例的马贝混合组织能提高10Ni5CrMo钢的低温韧性。
The continuous cooling transformation curve of 10Ni5CrMo steel was established by Gleeble-1500 thermal simulation testing machine. The microstructure transformation of 10Ni5CrMo steel at different cooling rates was analyzed. The results show that when the cooling rate is less than 0.2 ℃ / s, granular bainite is obtained in the steel and granular bainite and lower bainite are formed when the cooling rate is 0.5 ℃ / s. When the cooling rate is between 1 ~ 2 ℃ / s, the lath-shaped martensite and bainite mixed microstructure; when the cooling rate further increased to 5 ℃ / s, the steel has been a single martensite. In order to study the influence of cooling rate on the strength and low temperature toughness, different cooling methods were used in the laboratory to simulate different cooling rates and carry out impact and tensile tests. The experimental results show that the strength of the steel under different cooling methods is similar, and the low temperature impact toughness Have greatly improved. In-depth analysis of the fine structure under different cooling mode, Marbury mixed thin slab and slab beam. It is considered that the proper ratio of Mabei hybrid tissue can improve the low temperature toughness of 10Ni5CrMo steel.