球磨时间和退火热处理是粉末金相组织变化和晶粒细化的主要影响因素；
Milling time and annealing heat treatment are the main influencing factors for changing powder structure and fining grain.
采用SEM、TEM及XRD等方法研究了铜锌粉末在不同制备阶段时的金相组织。
The metallographic structures of Cu-Zn powder under different conditions were studied by SEM, TEM and XRD in this paper.
研究齿轮齿面激光熔覆粉末合金的工艺、显微硬度分布、熔覆层及过渡层等的金相组织及性能。
This paper deals with the technique of laser cladding on contact surface of gears, micro hardness distribution, microstructure and properties of cladding and transition layer.
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