潘鹏,王自东,左玲立,任国良,熊六一,汤忖江,祁晔思

• 1:北京机科国创轻量化科学研究院有限公司先进成形技术与装备国家重点实验室
• 2:北京科技大学材料科学与工程学院
• 3:宁波金汇精密铸造有限公司

摘要(Abstract)：

对制动盘用钢经900℃正火和880℃淬火后进行不同温度(550～700℃)的回火处理,利用光学显微镜、扫描电镜、电子背散射衍射技术、室温拉伸检测、室温冲击检测等方法研究了回火温度对其显微组织与力学性能的影响。结果表明:回火温度从550℃升高到620℃时,实验钢中的碳化物析出数量增加,并由细长棒状向颗粒状转变,分布均匀性也得到明显改善,马氏体板条边界变得模糊,甚至发生合并和吞噬使板条变宽;当回火温度提高到650℃及以上时,颗粒状碳化物发生明显粗化,大部分马氏体板条发生明显再结晶,形成多边形铁素体晶粒。随回火温度(550～700℃)的升高制动盘用钢的抗拉强度和屈服强度逐渐降低,在650℃发生显著下降,冲击吸收能量先缓慢提高(550～620℃)后明显升高(650～700℃);当回火温度为620℃时,实验钢的强韧匹配最好,其抗拉强度为1250 MPa,屈服强度为1172 MPa,断后伸长率为15.3%,冲击吸收能量为31 J。

关键词(KeyWords)： 制动盘用钢;显微组织;力学性能;碳化物;板条马氏体

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 潘鹏,王自东,左玲立,任国良,熊六一,汤忖江,祁晔思

DOI: 10.13289/j.issn.1009-6264.2019-0090

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