赵金华,董世通,路社斌,董嘉怡,闫家朋,何文武

• 1:太原科技大学材料科学与工程学院
• 2:北方重工富勒(沈阳)矿业有限公司
• 3:山西中煤平朔宇辰有限公司铸造厂

摘要(Abstract)：

采用分离式霍普金森压杆对动载荷下Mn18Cr2高锰铸钢的形变硬化行为进行了研究，利用电子背散射衍射(EBSD)技术和透射电镜(TEM)研究了不同冲击载荷下试验钢的微观组织及亚结构特征，探讨了其在不同冲击气压下的形变硬化机制。结果表明：Mn18Cr2高锰铸钢在动载荷下的变形过程包括弹性变形、抛物线硬化以及非硬化变形3个阶段；随着冲击气压由0.4 MPa增加至0.6 MPa,试验钢的抗压屈服强度出现陡增现象，平均抗压屈服强度由～372 MPa增加至～689 MPa;当冲击气压高于0.6 MPa时，在应变速率硬化、位错强化及动态应变时效3种硬化机制的耦合作用下，试验钢的形变硬化能力被充分激活，能够实现高强度及良好塑性的匹配。

关键词(KeyWords)： Mn18Cr2高锰铸钢;形变硬化机制;动载荷

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52304409);; 国家重点研发计划(2023YFB3405404)

作者(Author): 赵金华,董世通,路社斌,董嘉怡,闫家朋,何文武

DOI: 10.13289/j.issn.1009-6264.2025-0025

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