超高碳钢的球化工艺及性能研究  

Spheroidizing Process and Mechanical Properties of Ultra-High Carbon Steel

作　　者：樊亚军[1] 蔺卫平[1] 张占领[1] 朱杰武[1] 柳永宁[1] 

机构地区：[1]西安交通大学金属材料强度国家重点实验室,陕西西安710049

出　　处：《金属热处理》2007年第5期56-59,共4页Heat Treatment of Metals

基　　金：国家自然科学基金资助项目(50571077);陕西省科技攻关资助项目(2004K07-G18)

摘　　要：根据碳浓度不均匀奥氏体的离异共析转变机制,对1.6%C(质量分数,下同)锻造超高碳钢进行不同工艺的球化处理,并对具有不同球化组织的试样进行性能试验。观察分析表明,锻造后组织形态为片状珠光体及其域界分布球状碳化物;经球化工艺处理后得到铁素体基体上弥散分布碳化物的组织,且原珠光体域界上碳化物尺寸比珠光体域内的大;拉伸试验表明,1.6%C超高碳钢经球化处理后塑性明显改善,具有良好的综合力学性能。碳化物的分布、颗粒大小、间距等因素对1.6%C超高碳钢的强度有重要影响。The spheroidizing annealing tests were carried out on the 1.6% C forged UHCS （ultra-high carbon steel） based on DET（ Divorced Eutectoid Transformation） mechanism of the austenite with inhomogeneous carbon concentration. The mechanical properties of the UHCS samples with different microstructures were tested. The results show that there are fine lamellar pearlite and spherical carbides distributed on the pearlite boundaries in 1.6% C forged UHCS. The microstructure with fine carbide particles dispersedly distributing in ferrite matrix is formed after spheroidizing annealing, and carbides on pearlite boundaries are larger than those in pearlite interiors. The tensile tests show that the spheroidized 1.6% C UHCS has excellent plasticity and good mechanical properties. It is found that the strength of 1.6% C UHCS is significantly affected by the distribution, particle size and particle spacing of carbides.

关 键 词：超高碳钢 离异共析 球化工艺 碳化物 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]