讨论了20钢高温时效组织与超声波速度间的相关性。
The correlation between ultrasonic velocity and microstructure in 20g aged at high temperature is discussed.
花岗石平台（花岗石平板）经长期天然时效，组织结构均匀，线胀系数极小，内应力完全消失，不变形。
A granite platform (Granite Flat Panel) was a long-term natural aging, organizational structure, uniform, linear expansion coefficient is extremely small, internal stress disappear, not deformed.
通过对新型铝合金时效处理后的组织结构进行分析，研究了不同的时效温度和时间对该铝合金力学性能的影响。
The effect of aging temperature and aging time to new-type heat-resisting aluminum alloy forging structure and properties are introduced.
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