吴斯,李秀程,尚成嘉,韩建生,王群娣

• 1:北京科技大学材料科学与工程学院
• 2:太原重型机械厂

摘要(Abstract)：

针对欧洲高速动车使用的DB920车轮进行了工艺实验和实验室实验。结果表明,DB920车轮轮辋部位组织主要为少量铁素体和细珠光体,当组织中的铁素体比例较高且呈网状分布时,在进行断裂韧性评价实验时易出现撕裂状断口,在撕裂带侧面有大量韧窝,断裂韧性值(KQ)较高;相反,当铁素体比例较低时,断面相对平整,断裂方式以沿晶断裂和解理断裂为主,断裂韧性较差。组织分析和有限元模拟分析结果表明:喷水冷却时,轮辋处的冷却速度自踏面向内不断降低,冷速越慢,相变后生成铁素体比例就越高,断裂韧性也就越好。结合连续冷却实验的结果估算,对此成分车轮钢而言,当冷速大于1℃/s时,相变后不能获得足够的铁素体以保证此区域的断裂韧性。

关键词(KeyWords)： 高速动车车轮;断裂韧性;KQ值;铁素体比例

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 吴斯,李秀程,尚成嘉,韩建生,王群娣

DOI: 10.13289/j.issn.1009-6264.2012.07.001

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