7050铝合金高速二维超声滚压对表面质量的影响
|
摘要
为实现7050铝合金高效优质表面强化,将高速超声引入到二维超声滚压中,研究了7050铝合金高速二维超声滚压后的表面质量。首先采用单因素试验法对7050铝合金进行高速二维超声滚压加工试验,利用超景深测量仪和扫描电镜观察并对比分析了车削后与滚压后的表面形貌和微观组织;采用粗糙度测量仪、显微硬度计和X射线衍射仪测量滚压后的表面粗糙度、显微硬度和表面残余应力,并分析了不同工艺参数对表面质量的影响。结果表明:7050铝合金经高速二维超声滚压加工后,试件表面更为光滑,表层组织更致密,能有效降低表面粗糙度值、提高显微硬度,并形成残余压应力,表面粗糙度最低为0. 68μm,降幅达65%,表面显微硬度最大为156 HV0. 1,增幅达72%,表面残余压应力最高达-329. 5 MPa。在高速二维超声滚压中,7050铝合金工件表面粗糙度主要受静压力和转速影响,表面显微硬度受静压力、进给量和振幅影响较大,而表面残余压应力主要受进给量的影响。7050铝合金加工时表面组织及性能主要受冷塑性变形和温度场的综合影响,高速二维超声滚压加工工艺能够实现7050铝合金的优质高效强化处理。
In order to achieve high efficiency and quality surface strengthening of 7050 aluminum alloy,high-speed ultrasonic was introduced into two-dimensional ultrasonic rolling to study the surface quality. The high-speed two-dimensional ultrasonic rolling test of 7050 aluminum alloy was carried out by single factor test method,and the surface morphology and microhardness were observed and compared by means of ultra-depth measuring instrument and scanning electron microscopy. The surface roughness,microhardness and surface residual stress were measured by using roughness-measuring instrument,microhardness tester and X-ray diffractometer,and the effect of different process parameters on the surface quality was analyzed. The results show that after high-speed two-dimensional ultrasonic rolling of 7050 aluminum alloy,the surface of the specimens is smoother and the surface microstructure is denser,which can effectively reduce the surface roughness value,increase the microhardness,and form the residual compressive stress. The lowest surface roughness is 0. 68 μm,the reduction reaches 65%,the maximum microhardness value on the surface is 156 HV0. 1,the increase is 72%,and the maximum residual compressive stress on the surface is up to-329. 5 MPa. During the high-speed two-dimensional ultrasonic rolling test,the surface roughness is mainly affected by static force and rotational speed,the surface microhardness is greatly affected by static force,feed-rate and amplitude,and the surface residual compressive stress is largely affected by feed-rate. The surface microstructure and properties of 7050 aluminum alloy is affected by cold plastic deformation and temperature field,7050 aluminum alloy with high efficiency and high quality strengthening can be achieved by the process of the high-speed two-dimensional ultrasonic rolling.
In order to achieve high efficiency and quality surface strengthening of 7050 aluminum alloy,high-speed ultrasonic was introduced into two-dimensional ultrasonic rolling to study the surface quality. The high-speed two-dimensional ultrasonic rolling test of 7050 aluminum alloy was carried out by single factor test method,and the surface morphology and microhardness were observed and compared by means of ultra-depth measuring instrument and scanning electron microscopy. The surface roughness,microhardness and surface residual stress were measured by using roughness-measuring instrument,microhardness tester and X-ray diffractometer,and the effect of different process parameters on the surface quality was analyzed. The results show that after high-speed two-dimensional ultrasonic rolling of 7050 aluminum alloy,the surface of the specimens is smoother and the surface microstructure is denser,which can effectively reduce the surface roughness value,increase the microhardness,and form the residual compressive stress. The lowest surface roughness is 0. 68 μm,the reduction reaches 65%,the maximum microhardness value on the surface is 156 HV0. 1,the increase is 72%,and the maximum residual compressive stress on the surface is up to-329. 5 MPa. During the high-speed two-dimensional ultrasonic rolling test,the surface roughness is mainly affected by static force and rotational speed,the surface microhardness is greatly affected by static force,feed-rate and amplitude,and the surface residual compressive stress is largely affected by feed-rate. The surface microstructure and properties of 7050 aluminum alloy is affected by cold plastic deformation and temperature field,7050 aluminum alloy with high efficiency and high quality strengthening can be achieved by the process of the high-speed two-dimensional ultrasonic rolling.
引文
[1]Rajabi F,Zarei-Hanzaki A,Khoddam S,et al.The effects of rolling parameters on the mechanical behavior of 6061 aluminum alloy[J].Materials Science and Engineering A,2013,578(31):90-95.
[2]Bozdana A T,Gind N N Z,Li H.Deep cold rolling with ultrasonic vibrations-a new mechanical surface enhancement technique[J].International Journal of Machine Tools and Manufacture,2005,45(6):713-718.
[3]王燕礼,朱有利,杨嘉勤.滚压强化技术及在航空领域研究应用进展[J].航空制造技术,2018,61(5):75-83.Wang Yauli,Zhu Youli,Yang Jiaqin.Rolling reinforcement technology and its research application progress in aviation field[J].Aeronautical Manufacturing Technology,2018,61(5):75-83.
[4]Cheng M L,Zhang D Y,Chen H W,et al.Surface nanocrystallization and its effect on fatigue performance of high-strength materials treated by ultrasonic rolling process[J].International Journal of Advanced Manufacturing Technology,2016,83(1/4):123-131.
[5]Liu D,Liu D X,Zhang X H,et al.Surface nanocrystallization of 17-4precipitation-hardening stainless steel subjected to ultrasonic surface rolling process[J].Materials Science and Engineering A,2018,726(30):69-81.
[6]Zhang Q L,Hu Z Q,Su W W,et al.Microstructure and surface properties of 17-4PH stainless steel by ultrasonic surface rolling technology[J].Surface and Coatings Technology,2017,321(15):64-73.
[7]Lu L X,Sun J,Li L,et al.Study on surface characteristics of 7050-T7451 aluminum alloy by ultrasonic surface rolling process[J].The International Journal of Advanced Manufacturing Technology,2016,87(9/12):2533-2539.
[8]胡国雄,盛光敏,韩靖.塑性变形诱发表面自纳米化的研究及其应用[J].材料导报,2007,21(4):117-121.Hu Guoxiong,Sheng Guangmin,Han Jin.Investigation and application of surface self nano-crystal lization induced by severe plastic deformation[J].Materials Review,2007,21(4):117-121.
[9]蒋书祥,郑建新.二维超声滚压7050铝合金的微观组织与力学性能[J].金属热处理,2018,43(5):116-119.Jiang Shuxiang,Zheng Jianxin.Microstructure and mechanical properties of 7050 aluminum alloy treated by two dimensional ultrasonic rolling[J].Heat Treatment of Metals,2018,43(5):116-119.
[10]郑建新,罗傲梅.6061-T6铝合金纵-扭复合振动超声深滚加工试验研究[J].稀有金属材料与工程,2015,44(3):733-737.Zheng Jianxin,Luo Aomei.Experimental study on aluminum alloy6061-T6 by ultrasonic deep rolling with longitudinal-torsional vibration[J].Rare Metal Materials and Engineering,2015,44(3):733-737.
[11]Geng D X,Zhang D Y,Xu Y G,et al.Rotary ultrasonic elliptical machining for side milling of CFRP:Tool performance and surface integrity[J].Ultrasonics,2015,59(4):128-137.
[12]Chen L Q,Xiang B,Ren X C,et al.Influences of surface ultrasonic rolling processing parameters on surface condition of axle steel used in high speed trains[J].China Surface Engineering,2014,43(12):1-5.
[13]王凌云,黄红辉,谢志江.航空铝合金薄壁零件高速加工铣削力[J].中南大学学报(自然科学版),2017(7):1756-1761.Wang Lingyun,Huang Honghui,Xie Zhijiang.Milling force of aerospace aluminum alloy thin-wall parts in high-speed machining[J].Journal of Central South University(Science and Technology),2017(7):1756-1761.
[14]张翔宇,隋翯,姜兴刚,等.超声振动切削技术发展简述[J].电加工与模具,2018(1):1-6.Zhang Xiangyu,Sui He,Jiang Xinggang,et al.A brief introduction to the development of ultrasonic vibration cutting technology[J].Electromachining and Mould,2018(1):1-6.
[15]张翔宇,隋翯,张德远,等.高速超声振动切削钛合金可行性研究[J].机械工程学报,2017,53(19):120-127.Zhang Xiangyu,Sui He,Zhang Deyuan,et al.Feasibility study of high-speed ultrasonic vibration cutting titanium alloy[J].Journal of Mechanical Engineering,2017,53(19):120-127.
[16]Zhang X Y,Sui H,Zhang D Y,et al.Feasibility study of high-speed ultrasonic vibration cutting titanium alloy[J].Journal of Materials Processing Technology,2017,247(19):120-127.
[2]Bozdana A T,Gind N N Z,Li H.Deep cold rolling with ultrasonic vibrations-a new mechanical surface enhancement technique[J].International Journal of Machine Tools and Manufacture,2005,45(6):713-718.
[3]王燕礼,朱有利,杨嘉勤.滚压强化技术及在航空领域研究应用进展[J].航空制造技术,2018,61(5):75-83.Wang Yauli,Zhu Youli,Yang Jiaqin.Rolling reinforcement technology and its research application progress in aviation field[J].Aeronautical Manufacturing Technology,2018,61(5):75-83.
[4]Cheng M L,Zhang D Y,Chen H W,et al.Surface nanocrystallization and its effect on fatigue performance of high-strength materials treated by ultrasonic rolling process[J].International Journal of Advanced Manufacturing Technology,2016,83(1/4):123-131.
[5]Liu D,Liu D X,Zhang X H,et al.Surface nanocrystallization of 17-4precipitation-hardening stainless steel subjected to ultrasonic surface rolling process[J].Materials Science and Engineering A,2018,726(30):69-81.
[6]Zhang Q L,Hu Z Q,Su W W,et al.Microstructure and surface properties of 17-4PH stainless steel by ultrasonic surface rolling technology[J].Surface and Coatings Technology,2017,321(15):64-73.
[7]Lu L X,Sun J,Li L,et al.Study on surface characteristics of 7050-T7451 aluminum alloy by ultrasonic surface rolling process[J].The International Journal of Advanced Manufacturing Technology,2016,87(9/12):2533-2539.
[8]胡国雄,盛光敏,韩靖.塑性变形诱发表面自纳米化的研究及其应用[J].材料导报,2007,21(4):117-121.Hu Guoxiong,Sheng Guangmin,Han Jin.Investigation and application of surface self nano-crystal lization induced by severe plastic deformation[J].Materials Review,2007,21(4):117-121.
[9]蒋书祥,郑建新.二维超声滚压7050铝合金的微观组织与力学性能[J].金属热处理,2018,43(5):116-119.Jiang Shuxiang,Zheng Jianxin.Microstructure and mechanical properties of 7050 aluminum alloy treated by two dimensional ultrasonic rolling[J].Heat Treatment of Metals,2018,43(5):116-119.
[10]郑建新,罗傲梅.6061-T6铝合金纵-扭复合振动超声深滚加工试验研究[J].稀有金属材料与工程,2015,44(3):733-737.Zheng Jianxin,Luo Aomei.Experimental study on aluminum alloy6061-T6 by ultrasonic deep rolling with longitudinal-torsional vibration[J].Rare Metal Materials and Engineering,2015,44(3):733-737.
[11]Geng D X,Zhang D Y,Xu Y G,et al.Rotary ultrasonic elliptical machining for side milling of CFRP:Tool performance and surface integrity[J].Ultrasonics,2015,59(4):128-137.
[12]Chen L Q,Xiang B,Ren X C,et al.Influences of surface ultrasonic rolling processing parameters on surface condition of axle steel used in high speed trains[J].China Surface Engineering,2014,43(12):1-5.
[13]王凌云,黄红辉,谢志江.航空铝合金薄壁零件高速加工铣削力[J].中南大学学报(自然科学版),2017(7):1756-1761.Wang Lingyun,Huang Honghui,Xie Zhijiang.Milling force of aerospace aluminum alloy thin-wall parts in high-speed machining[J].Journal of Central South University(Science and Technology),2017(7):1756-1761.
[14]张翔宇,隋翯,姜兴刚,等.超声振动切削技术发展简述[J].电加工与模具,2018(1):1-6.Zhang Xiangyu,Sui He,Jiang Xinggang,et al.A brief introduction to the development of ultrasonic vibration cutting technology[J].Electromachining and Mould,2018(1):1-6.
[15]张翔宇,隋翯,张德远,等.高速超声振动切削钛合金可行性研究[J].机械工程学报,2017,53(19):120-127.Zhang Xiangyu,Sui He,Zhang Deyuan,et al.Feasibility study of high-speed ultrasonic vibration cutting titanium alloy[J].Journal of Mechanical Engineering,2017,53(19):120-127.
[16]Zhang X Y,Sui H,Zhang D Y,et al.Feasibility study of high-speed ultrasonic vibration cutting titanium alloy[J].Journal of Materials Processing Technology,2017,247(19):120-127.