超声振动滚挤压对金属表面微观组织的影响
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摘要
超声振动滚挤压技术为新型高能表面强化技术,对提升表面完整性和改善零件抗疲劳性能有显著效果。选用45钢金属材料进行了超声振动滚挤压对表面微观组织影响的试验研究,并分析了超声振动滚挤压对改善表面微观组织的作用机理。结果表明:超声振动滚挤压能够使零件表面微观组织出现明显的纤维化效果,且纤维化程度与超声振幅、挤压速度有关;超声振幅越大,零件表面的纤维组织越细,当振幅A=6μm时,小纤维厚度达1.25μm;挤压速度越小越有利于纤维组织的产生,产生的纤维宽度也越细,当挤压速度大于345mm/s时,不再产生纤维组织。表面组织的纤维化有效提升了零件的抗疲劳性能。
Ultrasonic rolling process,as a novel high energy technology,can effectively improve surface roughness,and greatly improve fatigue performance of part. In the present part,experimental work are carried out on the behavior of microstructure on the surface of 45 steel by using of ultrasonic rolling process,and effects of ultrasonic vibrations on behavior of microstructure are analyzed.The results show that a mass of fibrosis grains can be generated by using of ultrasonic rolling process,while the ultrasonic vibration plays a key role on the generation of fibrosis grains.Smaller fibrosis grains can be achieved by using of a larger vibration amplitude,while the size of fibrosis grains is 1.25μm when a 6μm vibration amplitude is adopted. Smaller fibrosis grains can also be achieved by using of lower rolling speed,while no fibrosis grains can be achieved when the speed is larger than 345 mm/s.It can be inferred that the generation of fibrosis grains greatly contributes to the improvement of fatigue performance.
Ultrasonic rolling process,as a novel high energy technology,can effectively improve surface roughness,and greatly improve fatigue performance of part. In the present part,experimental work are carried out on the behavior of microstructure on the surface of 45 steel by using of ultrasonic rolling process,and effects of ultrasonic vibrations on behavior of microstructure are analyzed.The results show that a mass of fibrosis grains can be generated by using of ultrasonic rolling process,while the ultrasonic vibration plays a key role on the generation of fibrosis grains.Smaller fibrosis grains can be achieved by using of a larger vibration amplitude,while the size of fibrosis grains is 1.25μm when a 6μm vibration amplitude is adopted. Smaller fibrosis grains can also be achieved by using of lower rolling speed,while no fibrosis grains can be achieved when the speed is larger than 345 mm/s.It can be inferred that the generation of fibrosis grains greatly contributes to the improvement of fatigue performance.
引文
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[2]Rodríguez A,Lacalle L N,Celaya A,et al.Surface improvement of shafts by the deep ball-burnishing technique[J].Surface & Coatings Technology,2012(206):2817-2824.
[3]赵婧,夏伟,李风雷,等.滚压表面强化机理的研究现状与进展[J].工具技术,2010,44(11):3-8.
[4]周航,周旭东,周宛.金属零件表面滚压强化技术的现状与展望[J].工具技术,2009,43(12):18-22.
[5]王东坡,宋宁霞,王婷,等.纳米化处理超声金属表面[J].天津大学学报,2007,40(2):228-233.
[6]Wang T,Wang D P,Liu G,et al.Investigations on the nanocrystallization of 40Cr using ultrasonic surface rolling processing [J].Applied Surface Science,2008,25(5):1824-1829.
[7]龚宝明.金属超声表面滚压加工纳米化研究[D].天津:天津大学,2008.
[8]Liu Y,Wang L J,Wang D P.Finite element modeling of ultrasonic surface rolling process[J].Journal of Materials Processing Technology,2011(211):2106-2113.
[9]Liu Y,Zhao X H,Wang D P.Determination of the plastic properties of materials treated by ultrasonic surface rolling process through instrumented indentation[J].Materials Science & Engineering A,2014,600:21-31.
[10]吕光义,朱有利,李礼,等.超声深滚对TC4钛合金表面形貌和表面粗糙度的影响[J].中国表面工程,2007,20(4):38-41.
[11]Zhu Y L,Wang K,Huang Y L.Evaluation of an ultrasound-aided deep rolling process for anti-fatigue applications[J].JMEPEG,2009(18):1036-1040.
[12]朱有利,叶雄林,何嘉武,等.超声深滚处理改善预腐蚀7A52-CZ铝合金疲劳性能机理[J].材料工程,2009(1):41-45.
[13]朱有利,李礼,王侃,等.一种超声深滚与滚光一体化抗疲劳制造技术[J].机械工程学报,2009,45(9):183-186.
[14]李礼,朱有利.Ti6A14V合金超声深滚层的组织结构特征[J].稀有金属材料与工程,2010,39(10):1754-1757.
[15]Xie J F,Zhu Y L,Bai C,et al.Microstructure characteristics of 30CrMnSiNi2A steel after ultrasound-aided deep rolling[J].Journal of Materios Engineering and Performance,2013(22):1642-1648.
[16]Cheng Minglong,Zhang Deyuan,Chen Huawei,et al.Development of ultrasonic thread root rolling technology for prolonging the fatigue performance of high strength thread[J].Journal of Materials Processing Technology,2014,214:2395-2401.