Microstructure and properties of nitrided layer of titanium plate,produced by simultaneous laser quenching and liquid-nitrogen cryogenics  

作　　者：YAO QuanTong TIAN Chen SUN Jian ZUO Liang TONG WeiPing 

机构地区：[1]Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University [2]Department of Materials Science and Engineering, Hefei University of Technology [3]School of Materials Science and Engineering, Northeastern University

出　　处：《Science China(Technological Sciences)》2018年第12期1901-1906,共6页中国科学（技术科学英文版）

基　　金：supported by the National High Technology Research and Development Program of China(Grant No.2012AA03A508);the National Natural Science Foundation of China(Grant Nos.U1360102,51275344)

摘　　要：In the present study, titanium plate was treated by a novel method of laser quenching, simultaneously combined with liquidnitrogen cryogenics(LQLNC). The microstructure and properties of the titanium plate after treatment were investigated by X-ray diffraction, scanning electron microscopy, energy dispersive spectrometry, Vickers hardness testing, and friction wear testing.The results show that the treated titanium plate is covered by a nitrided layer with a homogeneous thickness of about 60 μm,while the nitrided layer consists of Ti N and α-Ti phases. Compared to general laser quenching, the LQLNC treatment increases the hardness and wear resistance of the surface-modified layer of the titanium plate. As a result of grain refinement in the nitrided layer, the cracking induced by the rapid solidification of the conventional laser-quenching process has also been effectively solved.In the present study, titanium plate was treated by a novel method of laser quenching, simultaneously combined with liquidnitrogen cryogenics(LQLNC). The microstructure and properties of the titanium plate after treatment were investigated by X-ray diffraction, scanning electron microscopy, energy dispersive spectrometry, Vickers hardness testing, and friction wear testing.The results show that the treated titanium plate is covered by a nitrided layer with a homogeneous thickness of about 60 μm,while the nitrided layer consists of Ti N and α-Ti phases. Compared to general laser quenching, the LQLNC treatment increases the hardness and wear resistance of the surface-modified layer of the titanium plate. As a result of grain refinement in the nitrided layer, the cracking induced by the rapid solidification of the conventional laser-quenching process has also been effectively solved.

关 键 词：laser QUENCHING liquid nitrogen titanium plate HARDNESS WEAR resistance 

分 类 号：TH[机械工程]