60Si2Mn钢超细晶粒淬火和快速电回火

THE ULTRAFINE-GRAINED QUENCHING AND SNAP ELECTRIC TEMPERING FOR THE SILLICON-MANGANESE STEEL 60Si_2Mn

本文采用直接电阻法对60Si2Mn钢进行超细晶粒淬火及快速电回火。并对其组织结构、力学性能、疲劳寿命与超细晶粒热处理的关系作了试验和分析。结果表明:该法可将淬火晶粒细化到11级,碳化物呈粒状、弥散、均匀分布,且避免了表面脱碳;快速回火后,工件仍存在着马氏体相变产生的压应力。经疲劳试验仍保留较大的压应力;因此能有效地改善材料的使用性能。屈服强度的提高比抗拉强度的提高显著,屈强比可达0.93—0.95;疲劳寿命延长75％—100％以上。

Sillicon-Manganese spring steel 60Si2Mn treated as the ultrafine-grained quenching and snap electric tempering. The microstructures, mechanical properties and the relationship between the fatique life & ultratine-grained heat treatment process of the steel were investigated in this paper. The results showed that the grain size might be fined to ASTM 11. The granular carbonides well-distributed in the steel as dispersed particles. And avoided the decarbonization on the surface of it, After snap tempering, exist -ed the effective stress formed from the transformation of martensites and kept the stress throughout the fatique bending tests. The increment of yield strength was more than the increment of extension strength.The ratio of yield to extension strength were 0.93 to 0.95.The fatigue lives of leaf springs were increased above 75% to 100%.