Cu对TA15-2钛合金表面Stellite 12基激光合金化涂层组织结构及耐磨性的影响*
李嘉宁, 男, 1982年生, 博士
收稿日期: 2013-07-29
修回日期: 2013-12-18
网络出版日期: 2014-05-20
基金资助
*国家自然科学基金项目51175035及中国博士后科学基金项目2012M520135资助
INFLUENCE OF Cu ON MICROSTRUCTURES AND WEAR RESISTANCE OF STELLITE 12 MATRIX LASER ALLOYING COATINGS ON TA15-2 TITANIUM ALLOY
Received date: 2013-07-29
Revised date: 2013-12-18
Online published: 2014-05-20
Supported by
Supported by National Natural Science Foundation of China (No.51175035) and China Postdoctoral Science Fuondation Funded Project (No.2012M520135)
在TA15-2表面进行激光同轴送粉合金化Stellite 12-B4C粉末制备耐磨复合涂层. 研究表明, 加入Cu可促使大量超细纳米多晶体及非晶相在涂层中产生, 从而增强涂层的耐磨性. Cu对激光合金化涂层的纳米化过程, 是利用Cu在激光熔池中原位化学反应生成的AlCu2Ti超细纳米晶相来抑制颗粒长大的过程, 也是大量纳米多晶体生成的过程. 含Cu涂层主要由γ-Co, M12C, M23C6, W-C, Ti-B及AlCu2Ti晶化相、大量非晶相构成. AlCu2Ti超细纳米晶在高温熔池中具有较高的扩散率, 易引发晶格畸变, 使涂层发生非晶化转变.
李嘉宁 , 巩水利 , 王娟 , 单飞虎 , 李怀学 , 吴冰 . Cu对TA15-2钛合金表面Stellite 12基激光合金化涂层组织结构及耐磨性的影响*[J]. 金属学报, 2014 , 50(5) : 547 -554 . DOI: 10.3724/SP.J.1037.2013.00458
Coaxial powder feeding laser alloying of the Stellite 12-B4C mixed powders on an aviation material TA15-2 titanium alloy substrate can form a wear resistance composite coating. Investigation indicated that the Cu addition promoted a great quantity of the ultrafine nanoscale polycrystals and amorphous phases to be produced in such coating, leading to an improvement of wear resistance. The nanocrystallization process of Cu on laser clad coatings, i.e. and the process of the productions of the nanoscale polycrystals, and also the AlCu2Ti ultrafine nanocrystals which were produced through in situ chemical reaction in laser molten pool retarded greatly growth of the particles. The coating with Cu mainly consisted of γ-Co, M12C, M23C6, W-C, Ti-B, AlCu2Ti and also the amorphous phases. AlCu2Ti ultrafine nanocrystals owned the high diffusibility in such high temperature molten pool, causing the lattice distortions, which also played an important amorphization effect on such coating.
Key words： laser alloying; surface reinforcement; wear property; amorphous; nanocrystal
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