新型贝氏体钢汽车板簧材料的性能研究  

Properties of a New Type Bainitic Steel for Automobile Leaf Spring

作　　者：黄敬新[1] 白秉哲[1] 余贵春[1] 杨志刚[1] 方鸿生[1] 

机构地区：[1]清华大学材料与科学工程系,北京100084

出　　处：《金属热处理》2004年第11期1-5,共5页Heat Treatment of Metals

基　　金：国家科技部"863"项目 (编号 2 0 0 3AA3 3 10 40 )

摘　　要：设计了一类 (0 38～ 0 4 4) %C Mn Si Cr成分的贝氏体钢汽车板簧材料 ,测定了常规力学性能 ,分析了组织特征。结果表明 ,该钢奥氏体化后空冷具有贝氏体 /马氏体复相组织 ;奥氏体化后空冷 ,经中低温回火后 ,其力学性能σb≥ 180 0MPa ,σ0 2 ≥ 16 0 0MPa ,δ5≥ 7%,ψ≥ 35 %,均显著超过 6 0Si2Mn钢的性能 ,屈强比 >0 8。钢中较高的Si含量使钢的第一类回火脆性温度升高 ,但随含碳量的增加 。A type of bainitic steel for automobile leaf spring with the composition of (0.38～0.44)%C-Mn-Si-Cr was designed,and their conventional mechanical properties were measured and the microstructures were observed and analyzed.The results show that bainite/martensite mixed microstructure can be obtained by air cooling after austenization of this type bainitic steel.After being austenitized,then air-cooled and tempered at low temperature,their mechanical properties σ_b,σ_(0.2),δ_5 and ψ are more than 1800MPa,1600MPa,7% and 35% respectively.All properties of the designed steel are obviously more than these of 60Si2Mn steel,and the yield ratio of the designed steels is more than 0.8.The starting temperature appearing the one-step temper brittleness rises owing to the higher content of silicon in the steel,however,it will reduce with the increase of the carbon content.

关 键 词：弹簧钢 板簧 贝氏体/马氏体复相组织 屈强比 

分 类 号：TG142.1[一般工业技术—材料科学与工程]