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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 *

Acta Metallurgica Sinica(2014)

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Abstract
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y-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.
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Key words
laser alloying,surface reinforcement,wear property,amorphous,nanocrystal
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