加热辅助超声滚压40Cr钢表面织构化  

Surface Texturing of 40Cr Steel by Heat-assisted Ultrasonic Rolling

作　　者：王明远 邓建新[1] 吴佳星 田润洲 王军燕 马苛欣 WANG Mingyuan;DENG Jianxin;WU Jiaxing;TIAN Runzhou;WANG Junyan;MA Kexin(School of Mechanical Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学机械工程学院,济南250061

出　　处：《中国表面工程》2024年第5期325-336,共12页China Surface Engineering

基　　金：国家自然科学基金(52275443)。

摘　　要：超声滚压织构化技术具有独特的表面强化效果。加热辅助超声滚压技术能够克服单一超声滚压适用范围和强化效果有限的缺点,但当前温度对于织构化表面性能的影响规律尚不清晰。为了克服超声滚压织构化技术的局限性,利用加热辅助超声滚压技术在40Cr钢表面进行微织构制备,研究温度对超声滚压织构化表面的形貌和力学性能的影响;建立加热辅助超声滚压制备表面织构的三维有限元模型,对超声滚压过程进行仿真分析。结果显示:加热可以加剧材料表面的塑性变形程度,获得更大尺度的超声滚压表面织构形貌,但200℃时会因为滚压球与基体之间发生粘附而造成表面损伤;通过截面形貌可以看出,加热辅助超声滚压能够形成更深的塑性变形层;织构化表面的残余压应力和显微硬度随温度升高先增大后减小,在温度为150℃时制备的微织构表面拥有最佳的综合力学性能。XRD结果显示,残余应力和显微硬度的提高与超声滚压造成的材料表面晶粒细化有关,加热可以加剧塑性变形程度进而促进晶粒细化,但温度升高也会使晶粒呈现生长粗化的趋势,150℃下制备的超声滚压织构化表面平均晶粒尺寸最小。将加热引入超声滚压表面织构化加工过程,并研究温度对材料表面性能的影响规律,研究结果有助于进一步改善织构化表面性能,也可以为超声滚压技术的研究和应用提供新思路。Ultrasonic rolling texturing has been proven to exhibit distinctive surface enhancement effects.However,the singular application of ultrasonic rolling encounters challenges when processing materials with high hardness.Furthermore,its ability to enhance the surface performance of materials has an inherent limitation that restricts its further application.To overcome the limitations of ultrasonic rolling texturing,in this study,a heat-assisted ultrasonic rolling technique was employed for micro-texturing preparation on the surface of 40Cr steel.The study aimed to achieve better performance on textured surfaces by using the temperature field to evaluate the influence of temperature on the microstructure and mechanical properties of the material.Additionally,the study evaluated the effect of temperature on the morphological and mechanical properties of ultrasonic rolling-textured surfaces.Before conducting ultrasonic rolling tests,the specimens underwent grinding and polishing and were heated to predetermined temperatures(20,100,150,and 200℃).The processing trajectory followed a reciprocating linear path.Additionally,a three-dimensional finite element model was established using ABAQUS software to simulate the ultrasonic rolling process at different temperatures,utilizing the Johnson–Cook model to describe the plastic deformation of the material.The simulation results were compared with the experimental results.The latter revealed that the heat-assisted ultrasonic rolling texturing treatment formed a textured array on the material surface consisting of micro-protrusions and micro-grooves.Heating induced material softening and intensified the degree of plastic deformation on the material surface,resulting in a larger-scale morphology of the ultrasonically rolled textured surface.However,at 200℃,material surface damage occurred because of the adhesion between the rolling ball and substrate.The numerical simulation results indicated that heating intensified the material surface work hardening and expanded the rang

关 键 词：超声滚压 表面织构 温塑性成形 40Cr 有限元仿真 

分 类 号：TG663[金属学及工艺—金属切削加工及机床]