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7050-T7452锻件模拟高温服役环境下组织性能的演化
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-08-24
通过拉伸试验和微观组织观察等方法对经过不同温度和时间模拟高温服役环境热暴露处理后7050-T7452锻件的室温拉伸性能以及合金金相组织、析出相的变化情况进行系统研究。
7050-T7452锻件模拟高温服役环境下组织性能的演化Evolution of microstructure and properties of 7050-T7452
alloy forging simulation in high temperature service environment
通过拉伸试验和微观组织观察等方法对经过不同温度和时间模拟高温服役环境热暴露处理后7050-T7452锻件的室温拉伸性能以及合金金相组织、析出相的变化情况进行系统研究。结果表明：7050-T7452锻件在100~
175 ℃下热暴露处理后，合金的强度随热暴露温度的提高和时间的延长而降低，伸长率随之增加；当热暴露温度超过125
℃后，变化更为明显；随热暴露温度和时间的变化，合金的晶粒尺寸以及再结晶程度没有明显改变；当热暴露温度≤125
℃时，合金晶粒内部析出相的尺寸和种类没有明显变化；随热暴露时间的增加，晶界无析出带的宽度略有增宽；当热暴露温度超过125
℃时，合金晶内的析出相随温度以及热暴露时间的增加而迅速粗化，η相的体积分数增加，晶界无析出带加宽，合金的强度明显下降。
The evolution of microstructure and properties of
7050-T7452 alloy forging simulation in high temperature service environment for
different times and temperatures was studied by tensile test and transmission
electron microscopy．The results show that the strength of 7050-T7452 alloy
forging decreases with the thermal exposed time and temperature increasing in
the range of 100-175 ℃, however, the elongation increases. The change of
strength is obvious when the exposed temperature is higher than 125 ℃, and the
change of grain size and recrystallization is not obvious. When the exposed
temperature is lower than 125 ℃, the sizes and species of precipitates do not
change obviously. The width of precipitate-free zones (PFZs) increases a little
with the exposed time increasing. When the exposed temperature is higher than
125 ℃, the precipitates in matrix are coarser with the exposed temperature and
time increasing. Meanwhile, the precipitate size and width of PFZs increase
obviously, and the dominant precipitate is η phase. The strength of alloy
decreases visibly in this period.
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