车轮钢中的白点(二)

钢铁, 2007, 42(5): 74-78.

1.马鞍山钢铁股份有限公司技术中心,安徽,马鞍山,243000

2.马鞍山钢铁股份有限公司技术中心,安徽,马鞍山,243000

3.马鞍山钢铁股份有限公司技术中心,安徽,马鞍山,243000

4.北京科技大学材料物理系,北京,100083

5.北京科技大学材料物理系,北京,100083

基金项目: 国家自然科学基金(50471096)

About Flaking in Wheel Steel (Ⅱ)

研究了车轮钢中白点对力学性能的影响.结果表明,当白点含量少且尺寸较小时,对拉伸性能没有影响,但使冲击韧性明显下降;当白点含量较多或尺寸较大时,使拉伸性能下降,但对断裂韧性没有影响.钢中的白点能增加疲劳扩展速率并使扩展速率发生波动.氢致滞后开裂与白点无关,而与氢原子有关.

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