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GCr15轴承钢凝固过程中在钢锭模侧部引入不同功率超声波,研究其对组织性能的影响。结果表明,未加入超声波时,钢中柱状晶较粗大,组织不均匀;在合适的功率范围内,超声波可以细化钢中晶粒,使组织均匀。在0~500 W功率范围内,随着功率的增加,钢中合金元素的偏析逐步降低,在500 W时,C、Si的最大偏析度分别降低至1.129、1.196,统计偏析度分别降低到0.0693、0.1075。超声处理可以细化钢中碳化物,均匀碳化物分布,处理功率300 W时,细化后的碳化物平均尺寸为2.96μm,同时钢的抗拉强度、屈服强度、断面收缩率、伸长率分别提升至653 MPa、370 MPa、58%、27%。
During the solidification process of GCr15 bearing steel, different power ultrasonic waves were introduced into the side of the ingot mold to study its effect on the microstructure and properties. The results show that when no ultrasonic wave is added, the columnar crystals in the steel are coarser and the microstructure is not uniform. In the proper power range, the ultrasonic wave can refine the grains in the steel and make the microstructure uniform. In the power range of 0-500 W, the segregation of alloying elements in steel gradually decreases with the increase of power. The maximum segregation degrees of C and Si decrease to 1.129 and 1.196 respectively at 500 W, and the statistical segregation decreases to 0.0693 , 0.1075. Ultrasonic treatment can refine the distribution of carbides and uniform carbides in steel. When the power is 300 W, the average size of carbides after refining is 2.96 μm. At the same time, the tensile strength, yield strength, reduction of area and elongation Respectively, to 653 MPa, 370 MPa, 58%, 27%.