水电站用低碳贝氏体钢07MnCrMoVR的组织性能研究

摘要：采用不同的宽展比对水电站用低碳贝氏体钢07MnCrMoVR进行了轧制，对回火前后试验钢的微观组织形貌进行了观察，并对力学性能进行了检验，同时利用EDS能谱分析了回火过程中碳化物析出行为。结果表明：采用较小的宽展比能提高粗轧纵轧阶段的单道次压下率以及变形区系数，有效地破碎奥氏体再结晶晶粒，轧制后获得细小的粒状贝氏体组织，高温回火后析出大量的渗碳体和合金碳化物均匀弥散地分布在贝氏体铁素体基体上。随着回火温度的提高，试验钢强度性能呈现先升高再降低的现象，伸长率和低温冲击韧性持续升高。

Study on microstructure and properties of low carbon bainite steel 07MnCrMoVR for hydropower station

The low carbon bainite steel 07MnCrMoVR for hydropower stations was rolled with different wide spread ratios, the microstructure and mechanical properties of the test steels before and after tempering were observed and tested, respectively. And the carbide precipitation behavior during tempering was analyzed by EDS. The result show that the single pass reduction rate and deformation zone coefficient of roughing rolling stage can be improved by adopt smaller wide spread ratio, the fine granular bainite microstructure can be obtained after rolling by broken austenite recrystallization grains effectively at longitudinal rolling stage. After tempering at high temperature of test steels, a large number of cementite and alloy carbide are dispersed uniformly on the matrix of bainite ferrite. With the increase of tempering temperature, the strength of the test steels increases first and then decreases, the elongation and low temperature impact toughness continue to increase.