锻造超高碳钢的球化工艺与力学性能  

The Spheroidizing Annealing Technology and Mechanical Properties of Ultra-High Carbon Steels

作　　者：王宝奇[1] 彭会芬[1] 宋晓艳[1] 李红娟[1] 谷南驹[1] 石淑琴[1] 

机构地区：[1]河北工业大学材料学院,天津300132

出　　处：《材料热处理学报》2004年第1期27-31,共5页Transactions of Materials and Heat Treatment

基　　金：河北省自然科学基金项目 (50 0 0 2 3)

摘　　要：利用碳浓度不均匀奥氏体离异共析转变机制 ,借助于相图计算技术 ,对UHCs 1 0Al(含Al 1 0 %wt % )和UHCs 1 5Al(含Al1 5wt % )两种锻造超高碳钢提出了在三相区奥氏体化并在共析转变温度低限等温球化工艺 ,并对不同球化组织的力学性能进行了测定。组织观察表明 ,含Al超高碳钢锻态组织为极细的珠光体组织 ,Al的添加对网状碳化物有抑制作用 ,两种超高碳钢经最佳的球化工艺处理后得到了碳化物弥散分布于铁素体基体的复相组织 ,随碳化物球化程度的提高 ,塑性指标显著改善。球化UHCs 1 5Al超高碳钢达到了良好的综合力学性能 ,σb、σs 分别为 10 5 0MPa和 74 0MPa ,伸长率达到 14 %。The spheroidizing annealing technologies were proposed with aid of calphad technique to process two kinds of UHCs through the divorced eutectoid transformation mechanism of the austenite of inhomogenous carbon concentration, which consist of austenitizing at intermediate temperature in three phases (γ(fcc)+α(bcc)+cem) equilibrium aera and soaking below the eutectoid transformation temperature. The mechanical properties of the steels with different microstructures were tested. It is shown that the fine pearlite microstructure with few network carbide by the effect of Al addition present in the forged UHCs. Duplexphase microstructure with fine carbide particles distributed in the ferrite matrix has been obtained after spheroidizing process. The ductility of UHCs has been improved with spheroid ratio of laminated carbide in pearlite. UHCs-1.5Al after spheroidizing process exhbits good mechanical properties of σ b =1050MPa, σ s =740MPa and δ 5=14%.

关 键 词：超高碳钢 球化工艺 离异共析 锻造 

分 类 号：TG113[金属学及工艺—物理冶金] TG142.4[金属学及工艺—金属学]