The influence of processing parameters on laser cladding composite coatings on TiAl intermetallic alloy
-
摘要: 利用预涂NiCr-Cr3C2复合粉末对-γTiAl合金(简称TiAl合金)进行激光熔覆处理,制得了以Cr7C3,TiC硬质耐磨相为增强相,以-γNiCrAl镍基固溶体为基体的复合涂层;较系统地研究了光束扫描速度对TiAl合金激光熔覆复合材料涂层组织与耐磨性能的影响.结果表明,随着激光束扫描速度的提高,涂层显微组织有细化的趋势,显微硬度有所提高,而涂层厚度则有所降低.在中等扫描速度下(2.00mm/s)获得的涂层具有最好的滑动磨损耐磨性.Abstract: The effect of processing parameters on the microstructure and wear property of laser cladding γ/Cr7C3/TiC composite coatings on TiAl intermetallic alloy substrates with NiCr-50%Cr3C2precursor mixed powder is investigated.The results show that the microstructure of the laser cladding composite coatings is refined and the microhardness increases with the increasing of the laser beam scan-rate,but the thickness of the clad coating decreases.The laser cladding coating with the moderate(2.0mm/s) scan-rate exhibits the best wear-resistance under the full dry sliding wear test condition.
-
Keywords:
- laser cladding /
- TiAl intermetallic alloy /
- processing parameter /
- microstruc ture /
- wear-resistance
-
-
[1] YE H Q.Recent developments in Ti3Al and TiAl intermetallics re-search in China[J].Material Science Engineering,1999,A263:289～295.
[2] YANG R,CUI Y Y,DONG L M et al.Alloy development and shell mould casting of gamma TiAl[J].Journal of Material Processing Technology,2003,135:179～188.
[3] YOSHIHARA M,SUZUKI T,TANAKA R.Improvement of oxidation resistance for TiAl by surface treatment under a low partial pressure oxygen atmosphere and Al diffusion coatings[J].The Iron and Steel Institufe of Japan International,1991,31:1201～1206.
[4] XU D,ZHANG Z,LIU X et al.Improvement of oxidation resistance of TiAl by ion-beam-enhanced deposition coatings[J].Surface and Coatings Technology,1994,66:486～494.
[5] LIU X B,YU L G,WANG H M.Microstructure and properties of laser surface alloyed γ-NiCrAl/TiC/Cr7C3composite coatings on γ-TiAl intermetallic alloy[J].Rare Metal Materials Engineering,2001,30(3):224～227(in Chinese).
[6] LIU X B.Laser cladding for high-temperature wear-resistant composite coatings on γ-TiAl alloy[D].Beijing:Beijing University of Aeronautics Astronautics,2001.17(in Chinese).
[7] ZHANG W P,MA Y T,LU Sh.Microstructural characterization of in situ formed composite coating produced by laser cladding[J].Laser Technology,2005,29(1):38～39,55(in Chinese).
[8] TIAN Y Sh,CHEN Ch Zh,WANG D Y et al.Analysis of the growth mechanism of TiC crystal and the mechanical properties of the laser alloyed layer on the surface of pure titanium[J].Laser Technology,2005,29(2):113～115,137(in Chinese).
[9] WU X W,ZENG X Y,ZHU P D.Research on laser clad metal ceramics technology[J].Metal Heat Treatment,1992,4:40～43(in Chinese).
计量
- 文章访问数:
- HTML全文浏览量:
- PDF下载量:
下载: