摘要
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%。
Different ultrasonic power was introduced during GCr 15 steel solidification by the side of the ingot mould , and effect of ultrasonic on microstructure and properties of GCr 15 steel was studied .The results show that without ultrasonic , columnar crystals in the steel is coarse and microstructure is inhomogeneous.While under the suitable power of ultrasonic, the grain of GCr15 steel is fined and microstructure is uniformed. With ultrasonic power under 0-500 W, the segregation of alloy elements decreases gradually, and at 500 W, the maximum segregation and statistical segregation of C, Si reduce to 1.129,1.196 and 0.0693,0.1075, respectively.Ultrasonic treatment can make the carbide fining and make its distribution more uniform .While the ultrasonic power reaches to 300 W, the average diameter of carbide is decreased to 2.96 μm, and the tensile strength, yield strength, reduction of area and elongation increases to 653 MPa, 370 MPa, 58%and 27%respectively.
出处
《金属热处理》
CAS
CSCD
北大核心
2014年第6期53-57,共5页
Heat Treatment of Metals
基金
国家自然科学基金(51274004)
国家自然科学基金青年基金(51104001)
关键词
GCR15钢
超声波
凝固组织
元素偏析
碳化物
性能
GCr15 steel
ultrasonic
solidification microstructure
element segregation
carbide
mechanical properties
