激光重熔高锰钢的超声滚压强化及磨损性能研究  

Ultrasonic Rolling Strengthening and Wear Properties of Laser Remelted High Manganese Steel

作　　者：赵恩兰[1,2] 彭玉兴[1] 满家祥[2] 刘响 杨海峰[1] Zhao Enlan;Peng Yuxing;Man Jiaxiang;Liu Xiang;Yang Haifeng(School of Mechanical and Electrical Engineering,China University of Mining and Technology,Xuzhou 221l16,Jiangsu,China;School of Mechanical and Electrical Engineering,Xuzhou University of Technology,Xuzhou 221018,Jiangsu,China)

机构地区：[1]中国矿业大学机电工程学院,江苏徐州221116 [2]徐州工程学院机电工程学院,江苏徐州221018

出　　处：《中国激光》2024年第16期40-50,共11页Chinese Journal of Lasers

基　　金：国家自然科学基金项目(52275224);重庆大学高端装备机械传动全国重点实验室开放课题(SKLMT-MSKFKT-202225)。

摘　　要：由于冲击载荷引起的动态霍尔-佩奇效应,高锰钢具有优异的形变硬化特性。研究高锰钢的激光重熔非均匀显微组织凝固原理及对超声滚压硬化行为的影响具有重要意义。对Mn13钢板表面先后进行激光重熔处理和超声滚压强化,通过扫描电子显微镜、场发射电子探针显微分析仪和电子背散射衍射仪分析了激光重熔高锰钢的显微组织和凝固过程,通过维氏硬度计和摩擦磨损试验机研究了激光重熔高锰钢的非均匀组织对超声滚压硬化的影响。研究发现:由于激光重熔过程的高温度梯度和高冷却速度,凝固组织从上到下依次为较薄的等轴树枝晶和垂直于结合面生长的柱状树枝晶,枝晶间为小角度晶界,且存在Mn元素的偏析;激光重熔高锰钢的非均匀组织在超声滚压下具有孪生硬化行为,表面硬度和耐磨性均有较大程度的提高。因此,激光重熔技术在高锰钢的表面处理领域具有潜在的应用前景。Objective High manganese steel(HMnS)has good deformation hardening properties.Under impact load,its surface rapidly hardens,thereby improving surface hardness but maintaining good toughness inside.However,under low stress wear conditions,it often exhibits a low hardening behavior accompanied by early surface wear.The pre-hardening treatment of the HMnS surface can improve its mechanical properties under low impact and low stress conditions.Therefore,scholars have proposed various surface prehardening treatment methods for HMnS,such as mechanical shot peening,explosive hardening,laser shock,and ultrasonic shock.Laser remelting is the process of using a laser beam to melt the surface of a material and improve its microstructure and mechanical properties through the rapid solidification of the molten pool.Unlike the equiaxed grains of cast HMnS,laser remelted HMnS often forms typical columnar and equiaxed dendritic structures due to the high temperature gradient and high cooling rate during solidification.Therefore,exploring the hardening behavior and wear resistance of laser remelted HMnS under ultrasonic rolling is of great significance.Methods This study used continuous cast Mn13 steel plate for laser remelting,and its cross-sectional microstructure was equiaxed grains.The laser power used was 700 W,the laser wavelength was about 960 nm,the scanning speed was 5 mm/s,the spot diameter was 1.2 mm,and the overlap rate was 50%.To prevent oxidation during laser remelting,high-purity argon with volume fraction of99.99%gas was selected as the protective gas.An ultrasonic rolling strengthening device was used to treat the surface of HMnS after laser remelting with an amplitude of 4μm.The vibration frequency was 40 kHz,and the static pressures were 100 N and 200 N,respectively.The samples were sequentially ground,polished,and corroded using silicon carbide sandpaper,metallographic grinder,and aqua regia solution.Measurement and analysis of laser remelted HMnS before and after ultrasonic rolling were carried out using fie

关 键 词：激光技术 激光重熔 高锰钢 超声滚压 孪生硬化 磨损机理 

分 类 号：TN249[电子电信—物理电子学]