Name : XudongRen
Professor; Ph. D supervisor
Address : Room B405-IISchool of Mechanical Engineering
Phone: (86)013511696639, (86)511-88780352
Fax: (86)511-88780352
E-mail: renxd@ujs.edu.cn；renxudong@vip.163.com.
Education
2003-2009 Ph.D, Mechanical Manufacturing and Automation, Jiangsu University, China
1997-2001 BS, Mechanical Manufacturing and Automation, Jiangsu University of Technology, China
Professional Experience
2013.12- Ph.D Supervisor, Jiangsu University, China
2015.07- Professor, Jiangsu University, China
2015.06- Vice Dean of School of Mechanical Engineering, Jiangsu University, China
2015.03-2015.11 Visiting Scholar, City University of Hong Kong, China
2014.06-2015.03 Associate Professor, Jiangsu University, China
2010.11-2014.06 Deputy Chairman, Jiangsu University, China
2010.05-2010.10 Visiting Scholar, The University of Manchester, UK
2010.01-2012.12 PostDoc, Research Center of Fluid Machinery Engineering and Technology, China
Social academic post
Co-chair of the first Asian Laser Shock Peening Forum
Fellow of the International Society for Optics and Photonics
Senior fellow of Chinese Mechanical Engineering Society
Member of committee of experts of Chinese Society of Astronautics
Fellow of non-traditional machining branch of Chinese Mechanical Engineering Society
Research interests
1. Preparation of nano-diamond by employing nanosecond laser. The method allows synthesizing ultrafine nanocrystalline particles continuously at the ambient temperature and normal pressure. The particle size is shown independent of laser energy, which is ultrafine and ranges in 2~6nm. The theoretical grown size of nano-diamonds is found in well agreement with the experiment results. Four kinds of production were found: nano-diamond, spherical carbon nano-particles, flocculent amorphous carbon and graphenenano-ribbon rolls. A solid-vapor-plasma-liquid coexistence model describing phase transition from graphite to diamond induced by nanosecond laser processing was proposed. Graphenenano-ribbon rolls might be the intermediate phase in the conversion from graphite to diamond.
2. Establishmodel of improving laser hardening efficiency at high temperature service. To improve efficiency of laser hardening based on pulse duration modulation and beam optimization technology. Established ‘Meyers uniform dislocation stress nucleation’model and solved the problem of deformation of parts serving at high temperature after laser hardening.The method can effectively prevent the occurrence of fracture due to stress change andsolve the problem of uneven stress distribution and big stress gradient.
3. New method and application of anti-cavitation and wear resistance for key equipment by using laser technology.Studied the wall effect of jet induced by laser pulse, revealed the relationship between the laser parameters and mechanical properties near the wall corrosion. Developed strengthening device and method for water pump impeller which can locate any point of complex surface to repair the damage parts of the pump impeller.The method can effectively improve wear-resisting, corrosion resistance ofdamagedpump impeller parts.
Teaching Courses
Frontier of Mechanical Engineering，Ph. D/ master；Material Strengthening & Quality Evaluation，Ph. D/ master；Precise and Special Processing，Ph. D/ master.
Honors and Awards
1. Distinguished Young Scholars of Jiangsu Province, 2016
2. Second level of ‘333 project’ of Jiangsu Province, 2016
3. Golden Prize of Jiangsu Province Patent, 2015
4. 2ndNational Award for Technology Inventions, 2015
5. 2nd Prize of Henry Fok Young Teacher Award, 2014
6. Nomination Award of National Excellent Doctoral Dissertation, 2013
7. Third level of ‘333 Project’ of Jiangsu Province, 2013
8. 2nd Prize of National Science and Technology Progress Award, 2009
9. 1st Prize of Science and Technology Progress Award of PLA, 2008
10. 1st Prize of Jiangsu Science and Technology Progress Award, 2008
11. 2nd Prize of Technology Invention Award of Ministry of Education, 2006
12. 2nd Prize of Technology Invention Award of Jiangsu Government, 2005
Main Research Projects
1. Industrial demonstration and application of laser strengthening technology in aerospace and rail transit, National Key Research and Development Plan, 2016-2020；
2. Study of laser induced cavitation strengthening mechanism and the incentive characteristics, NSFC, 2015-2018；
3. Study of cool laser shock shaping for large structures, NSFC, 2016-2018；
4. Laser cavitation strengthening mechanism and the transient characteristic research, Distinguished Young Scholars of Jiangsu Province, 2016-2018；
5. Research on laser strengthening technology for China Ⅳ/Ⅴ emission vehicle engine crankshaft, Jiangsu Province, 2015-2017；
6. Application of laser strengthening key technology for pump cavitation and wear resistance, Ministry of Water Resources, 2015-2016；
7.Study of precise control and temperature limit for nanosecond laser processing of exceptional service key parts, NSFC, 2013-2016；
8.Mechanism of fatigue life extension based on high pressure nanosecond laser shock effect, NSFC, 2010-2012.
Main Scientific Publications
1. X. D. Ren*. Laser Shocking Nano-crystallization and High-temperature Modification(ISBN: 978-3-642-35673-5)[M], Springer Series in Materials Science, 2015.
2. X.D. Ren*, R. Liu, L.M. Zheng, Y.P. Ren, Z.Z. Hu, H. He. Graphite to ultrafine nanocrystalline diamond phase transition model and growth restriction mechanism induced by nanosecond laser processing[J]. Applied Physics Letters , 2015,107:141907.
3. X. D. Ren*, H. M. Yang, L. M. Zheng, S. Q. Yuan, S. X. Tang, N. F. Ren, and S. D. Xu.A conversion model of graphite to ultrananocrystalline diamond via laser processing atambient temperature and normal pressure[J]. Applied Physics Letters, 2014,105:021908.
4. X.D.Ren*, Q.B.Zhan, S.Q.Yuan, L.M.Zhen, H.M.Yang, F.Z.Dai. A finite element analysis of thermal relaxation of residual stress in laser shock processing Ni-based alloy GH4169 [J]. Materials & Design,2014, 54:708-711.
5.X.D.Ren*, L. Ruan, S.Q. Yuan, H.M. Yang, Q.B. Zhan, L.M. Zheng, Y. Wang, F.Z. Dai.Metallographic structure evolution of 6061-T651 aluminum alloy processed by laser shock peening: Effect of tempering at the elevated temperatures [J]. Surface and Coatings Technology, 2013, 221:111-117.
6. X.D. Ren*, W.F. Zhou, F.F. Liu, Y.P. Ren, S.Q. Yuan, N.F. Ren, S.D. Xu, T. Yang. Microstructure evolution and grain refinement of Ti-6Al-4V alloy by laser shock processing[J]. Applie d Surface Science, 2016,363:44-49.
7. X.D. Ren*, W.F. Zhou, Y.P. Ren, S.D. Xu, F.F.Liu, S.Q. Yuan, N.F. Ren, J.J. Huang. Dislocation evolution and properties enhancement of GH2036 by laser shock processing: Dislocation dynamics simulation and experiment[J]. Materials Science & Engineering A,2016, 654: 184–192.
8. X.D. Ren*, S.X. Tang, L.M. Zhenga, S.Q. Yuan, N.F. Ren, H.M. Yang, Y. Wang, W.F. Zhou, S.D. Xu. Direct transfer-adsorption: The new molecular dynamics transition mechanism of nano-diamond preparation by laser shock processing[J]. Journal of Crystal Growth, 2015,421:1-7.
9.X.D. Ren*, J.J. Huang, W.F. Zhou, S.D. Xu, F.F. Liu. Surface nano-crystallization of AZ91D magnesium alloy induced by laser shock processing [J]. Materials & Design, 2015,86: 421-426.
10. X.D. Ren*, W.F. Zhou, S.D. Xu, S.Q. Yuan, N.F. Ren, Y. Wang, Q.B. Zhan. Iron GH2036 alloy residual stress thermal relaxation behavior in laser shock processing[J]. Optics & Laser Technology,2015,74:29-35.
11. X.D.Ren*, Q.B.Zhan, H.M.Yang, F.Z.Dai, C.Y.Cui, G.F.Sun. The effects of residual stress on fatigue behavior and crack propagation from laser shock processing-worked hole [J]. Materials & Design, 2013, 44:149-154.
12. X.D.Ren*, L.Ruan, S.Q.Yuan, L.M.Zhen, Q.B.Zhan, H.M.Yang, F.Z.Dai. Dislocation polymorphism transformation of 6061-T651 aluminum alloy processed by laser shock processing: Effect of tempering at the elevated temperatures[J]. Materials Science & Engineering A, 2013, 578:96-102.
13. X.D. Ren*, Y.K. Zhang, D.W. Jiang, T. Zhang, G.F. Sun. A model for reliability and confidence level in fatigue statistical calculation. Theoretical and Applied Fracture Mechanics[J].2012,59:29-33.
14. X.D.Ren*, T.Zhang, Y.K.Zhang, D.W.Jiang, H.F.Yongzhuo, H.B.Guan, X.M.Qian. Mechanical properties and residual stresses changing on 00Cr12 alloy by nanoseconds laser shock processing at high temperatures[J]. Materials Science and Engineering: A, 2011,528:1949-1953.
15.X.D.Ren*, Y.K.Zhang, T.Zhang, D.W.Jiang, H.F.Yongzhuo, Y.F.Jiang, K.M.Chen. Comparison of the simulation and experimental fatigue crack behaviors in the nanoseconds laser shocked aluminum alloy[J]. Materials & Design, 2011,32(3):1138-1143.
16. X.D.Ren*,Y.K.Zhang, H.F.Yongzhuo, L.Ruan, D.W.Jiang, T.Zhang, K.M.Chen. Effect of laser shock processing on the fatigue crack initiation and propagation of 7050-T7451 aluminum alloy[J]. Materials Science and Engineering:A, 2011,528:2899-2903.
Patents
1. Method for preparing diamond-like film by virtue of high-power laser irradiation, China Patent Appl. No. ZL201310377771.8, Nov. 18, 2015.
2. Method for prolonging life of pump shells and blades by carrying out laser strengthening micro-cracks, China Patent Appl. No. ZL201310293346.0, Sep. 30, 2015.
3. High-quality laser modification life-prolonging method based on laser pulse width modulation, China Patent Appl. No. ZL201310469762.1, Sep. 30, 2015.
4. Workpiece surface intensifying method by laser micro processing, China Patent Appl. No.ZL201310536322.3, Aug. 5, 2015.
5.Device and method for improving preparation efficiency of diamonds, China Patent Appl. No.ZL201310319625.X, Jul. 8, 2015.
6. Method for preparing nano diamond composite coating by millisecond laser cladding, China Patent Appl. No. ZL201310292488.5, Jun. 10, 2015.
7. Device and method for strengthening gear of gear pump by using underwater laser impact, China Patent Appl. No. ZL201310384126.9, Jun. 10, 2015.
8. Device and method for preparing nano diamonds by high-energy lamp pumping solid laser, China Patent Appl. No. ZL201310472643.1, Mar. 4, 2015.
9. Method and device for preparing diamond-like carbon coating by cladding fiber laser, China Patent Appl. No. ZL201110367258.1, Jun. 25, 2014.
10. Method and device for preparing diamond film doped with ultrafine nano-structural metal particles, China Patent Appl. No. ZL201110367263.2, Apr. 9, 2014.
11. Laser thermomechanical effect strengthening method and laser thermomechanical effect strengthening system for automotive LED (light-emitting diode) headlight molds, China Patent Appl. No. ZL201110367257.7, Jul. 17, 2013.
12.Method and apparatus for acquiring nano-coating by utilizing shock waves generated by laser-induced continuous detonation, China Patent Appl. No. ZL201110120822.X, Jun. 19, 2013.
13.Method and apparatus for laser to induce plasma to inject into substrate, China Patent Appl. No. ZL201110120841.2, Jun. 19, 2013.
14. Nanosecond laser device capable of improving abrasion resistance and corrosion resistance of tooth, China Patent Appl. No. ZL201110065438.4, Jan. 23, 2013.
15. Reinforcement method for extending fretting fatigue life of material at high temperature, China Patent Appl. No. ZL200910232922.4, Nov. 7, 2012.
16.Method for reproducing high-temperature fatigue damage component, China Patent Appl. No. ZL200910184305.1, Apr. 4, 2012.
17.Reinforcement method and reinforcement device for improving high-temperature fatigue life of material, China Patent Appl. No. ZL200910184301.3, Mar. 21, 2012.
Plan for Overseas Master & Ph. D
Two Ph. D, one master
Distinguished professor