张朝磊,蒋波,赵帆,文成,周乐育,刘雅政

• 1:北京科技大学材料科学与工程学院

摘要(Abstract)：

通过研究连续冷却和等温相变规律,确定了27Si Mn钢贝氏体相变的条件,设计了其两段淬火+低温回火热处理工艺,从而获得贝氏体组织。结果表明:当过冷奥氏体以3~40℃/s连续冷却时,存在贝氏体相变,并且随着冷速增加,贝氏体量先逐渐增加然后逐渐减少;贝氏体等温相变温度区间为390~450℃。910℃加热30 min,油冷至(450±10)℃再空冷至室温分段淬火,然后250℃回火低温40 min,27Si Mn钢获得贝氏体组织,其抗拉强度890 MPa,屈服强度693 MPa,断后伸长率28.0%,断面收缩率67.0%,冲击功64 J,具有良好的强度、塑性和韧性匹配。

关键词(KeyWords)： 合金结构钢;相变规律;热处理;贝氏体

Abstract:

Keywords:

基金项目(Foundation): 中央高校基本科研业务费专项资金资助项目(FRF-TP-14-003A1)

作者(Author): 张朝磊,蒋波,赵帆,文成,周乐育,刘雅政

DOI: 10.13289/j.issn.1009-6264.2014.s2.024

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