1.6%C超高碳钢高温超塑性研究  

Study on High-temperature Superplasticity of 1.6%C 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] 许雁[2] 

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 [2]西北第二民族学院材料科学与工程系,宁夏银川750021

出　　处：《热加工工艺》2006年第22期10-12,共3页Hot Working Technology

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(2004KD7-G18)

摘　　要：1.6%C超高碳钢热轧后经810℃×1h+750℃×1h球化处理后获得理想的球化组织,碳化物颗粒大小、分布较均匀,铁素体晶粒尺寸为3￣5μm。高温拉伸试验表明,在2.5×10-4s-1的应变速率下,800℃时伸长率高达216%,获得很好的超塑性。扫描电镜分析表明,高温拉伸过程中晶粒基本上保持等轴状,碳化物沿晶界长大、粘连,晶内细小碳化物减少。超高碳钢的高温变形主要依靠晶粒的转动和晶界的滑动来实现。A spheroidizing technology （810℃ ×1h ＋750℃ ×1h ）was applied to 1.6% C ultra-high carbon steel （UHCS） after hot rolling,ideal spheroidizing microstructure was obtained with uniformly-distributed grained carbides and the ferrite matrix of crystal-size 3-5μm. High-temperature tensile test shows that superplasticity is excellent at 800℃ by strain rate of 2.5 × 10^-4 s^-1, and the extensibility is up to 216%. The microstructure after high-temperature tension shows that the crystal grains keep equiaxial during tensioning. Carbides grow up and even connect each other around grain boundary, with reducing free carbides in side grains. The superplastic deformation mechanics of the steel used is mainly the grain boundary sliding and grain rotating.

关 键 词：超高碳钢 球化 超塑性 

分 类 号：TG142.31[一般工业技术—材料科学与工程]