多频率冲击条件下新型重载铁路辙叉贝氏体钢试验研究  

Experimental Research on New Type Bainitic Steel for Heavy-load Railway Frog under Multi-frequency Impact

作　　者：朱腾 栾道成[1] 胡志华[1] 王正云[1] 孙维 袁培曦 ZHU Teng;LUAN Daocheng;HU Zhihua;WANG Zhengyun;SUN Wei;YUAN Peixi(School of Materials Science and Engineering,Xihua University,Chengdu 610039,China)

机构地区：[1]西华大学材料科学与工程学院,四川成都610039

出　　处：《热加工工艺》2024年第19期112-115,120,共5页Hot Working Technology

基　　金：四川省科技支撑项目(20ZDYF2461,20ZDZX0042);西华大学重点科研基金项目(Z203121)。

摘　　要：针对重载铁路辙叉恶劣的服役情况,对自行研发的新型重载铁路辙叉贝氏体钢进行多频率冲击试验,观察分析其微观组织及硬度变化规律。结果表明,经多频率冲击后,新型重载铁路辙叉贝氏体钢的组织内部晶粒发生碎化变形,晶界变得模糊,钢中残余奥氏体含量减少,其冲击表面发生塑性变形,产生加工硬化现象。在较高冲击功作用下,其冲击表层组织进一步纤维化,产生的加工硬化效果也更加明显。In view of severe service conditions of heavy-load railway frog,a new self-developed bainitic steel for heavy-load railway frog was subjected to multi-frequency impact tests to observe and analyze its microstructure and hardness change pattern.The results show that,the grains of new bainitic steel for heavy-load railway frog after multi-frequency impact are fragmented and deformed,the grain boundaries become blurred,the content of residual austenite is reduced,the plastic deformation and work-hardening phenomenon occur on its impact surface.The microstructure of its impact surface is further fibrillated and the work-hardening effect is also more obvious.

关 键 词：贝氏体钢 多频率冲击 残余奥氏体 加工硬化 

分 类 号：TG142.1[一般工业技术—材料科学与工程]