China Mechanical Engineering ›› 2024, Vol. 35 ›› Issue (11): 2043-2053,2081.DOI: 10.3969/j.issn.1004-132X.2024.11.016

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Microstructure and Ultrasonic Rolling Hardening Mechanism of Laser Wire Feeding Cladding High Manganese Steel Coatings

YANG Haifeng1,2;SUN Xinhui1,2;YUAN Dongqing3;ZHAO Enlan1,4;LIU Songyong1,2;PENG Yuxing1,2   

  1. 1.School of Mechanical and Electrical Engineering,China University of Mining and Technology,
    Xuzhou,Jiangsu,221116
    2.Key Laboratory of Mining Mechanical and Electrical Equipment in Jiangsu Province,Xuzhou,
    Jiangsu,221116
    3.Department of Mathematics and Physics,Jiangsu Ocean University,Lianyungang,Jiangsu,222005
    4.School of Mechanical and Electrical Engineering,Xuzhou University of Technology,Xuzhou,
    Jiangsu,221018

  • Online:2024-11-25 Published:2024-12-18

激光送丝熔覆高锰钢涂层的显微组织及超声滚压硬化机理

杨海峰1,2;孙昕辉1,2;袁冬青3;赵恩兰1,4;刘送永1,2;彭玉兴1,2   

  1. 1.中国矿业大学机电工程学院,徐州,221116
    2.江苏省矿山机电装备重点实验室,徐州,221116
    3.江苏海洋大学理学院,连云港,222005
    4. 徐州工程学院机电工程学院,徐州,221018

  • 作者简介:杨海峰,男,1981年生,副教授。研究方向为耐磨涂层的激光熔覆技术。发表论文60余篇。E-mail:yhf002@163.com。
  • 基金资助:
    国家自然科学基金(52275224);国家重点研发计划(2023YFB3406702);中国矿业大学研究生创新计划(2024WLJCRCZL115);江苏省研究生科研创新计划(SJCX24_1396)

Abstract: To preserve the excellent deformation hardening capability of high manganese steel components, the laser wire feeding cladding technology of high manganese steel coatings was proposed. High manganese steel coatings were fabricated on Mn13 steel plate using laser wire feeding technology, with the coating subsequently undergoing deformation hardening treatment via ultrasonic rolling technology. Analyses were conducted on the microstructure, phase composition, and mechanics properties of the coatings before and after ultrasonic rolling, thus revealing the hardening mechanism attributed to ultrasonic rolling. The results demonstrate that the microstructures of the laser wire feeding cladding high manganese steel coatings are the dendritic structures, featuring component segregation of Mn and C elements between the dendrites. No phase changes occur during the ultrasonic rolling processes, and both the hardness and wear resistance of the coatings are markedly enhanced post-ultrasonic rolling. The high manganese steel coatings exhibit dendritic segregation of C and Mn,dislocations, and twins, which significantly impeded the movement of dislocations during ultrasonic rolling, resulting in a higher density of dislocations. Owing to the twinning induced plastic deformation effect in high manganese steels, a substantial number of deformation twins are formed internally post-ultrasonic rolling, interacting between each other to further enhance the deformation hardening capacity of the high manganese steel coatings. Laser wire feeding cladding provides a technical foundation for high-performance surface repair of large high manganese steel components.

Key words:  , laser wire feeding cladding, high manganese steel, microstructure, ultrasonic rolling, deformation hardening mechanism

摘要: 为了维持高锰钢部件优异的形变硬化能力,提出了高锰钢涂层的激光送丝熔覆技术。使用激光送丝熔覆技术在Mn13钢板上制备了高锰钢涂层,并通过超声滚压技术对熔覆层表面进行形变硬化处理。分析了超声滚压前后高锰钢熔覆层的显微组织、相组成和力学性能,揭示了高锰钢熔覆层的超声滚压硬化机理。研究结果表明,激光送丝熔覆高锰钢涂层的显微组织为枝晶结构,且在枝晶间存在Mn、C元素的成分偏析;超声滚压过程中未出现相变,超声滚压后涂层的硬度、耐磨性均大幅提高;初始高锰钢涂层内部存在的C、Mn的枝晶偏析、位错和孪晶在超声滚压过程中严重阻碍了位错的运动,从而增大了位错的密度;由于高锰钢的孪晶诱导塑性变形效应,超声滚压后涂层内部会产生大量的形变孪晶,形变孪晶之间的相互作用进一步增强了高锰钢熔覆层的形变硬化能力。激光送丝熔覆为大型高锰钢部件表面的高性能修复提供了技术基础。

关键词: 激光送丝熔覆, 高锰钢, 显微组织, 超声滚压, 形变硬化机理

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