低碳Mn系水淬贝氏体钢的组织和力学性能Microstructure and properties of low-carbon water-cooled baintic steels
许峰云,白秉哲,方鸿生
摘要(Abstract):
研究了第二代Mn系空冷贝氏体钢合金体系,即低碳Mn系水淬贝氏体钢,为高强结构钢调质钢开辟了一条新途径,给出了试验钢在水淬工艺下的组织和力学性能。结果表明:随着冷却速度的加快,试验钢中将依次出现粒状贝氏体/仿晶界铁素体,粒状贝氏体,粒状贝氏体/马氏体组织,马氏体组织;与传统淬火钢27SiMn相比,试验钢具有突出优良的淬透性,韧性,切削性能,可以水冷,不需要油冷;直径300mm的圆柱淬火后可得到粒状贝氏体组织,试验钢经中低温回火后,屈服强度大幅上升,抗拉强度变化不大;在300℃回火后具有最高的屈服强度,1/2半径处,σb~900MPa,σ0.2~630MPa,AKU(-20℃)~60J,屈强比约为0.7;试验钢经高温回火后,将析出粒状碳化物,冲击韧度大幅上升,AKU5~65J。
关键词(KeyWords): Mn系贝氏体钢;Mn-Si钢;水冷;淬透性;粒状碳化物
基金项目(Foundation):
作者(Author): 许峰云,白秉哲,方鸿生
DOI: 10.13289/j.issn.1009-6264.2010.09.018
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