杨金侠郑启桑志茹郎海霞孙晓峰胡壮麒
金属学报
doi:10.3724/SP.J.1037.2010.00142
采用熔体处理工艺熔炼DZ40M返回料, 并进行返回料熔炼合金(返回合金)的拉伸、持久和蠕变性能测试. 结果表明, 熔体处理将返回料中的N含量由0.0078%降到0.0024%;S含量由0.0015%降到0.0007%. 熔体处理还降低了合金中杂质元素的含量和夹杂物含量,减少了合金中的显微疏松面积. 与常规工艺相比, 熔体处理提高了DZ40M返回合金的强度和延伸率, 尤其在室温和1000℃下延伸率提高了1倍以上. 熔体处理延长了合金的持久寿命, 改善了合金的蠕变性能, 使DZ40M返回合金的持久蠕变性能得到显著提高.
关键词:
返回合金
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melting treatment
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stress-rupture property
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creep property
R.Z.Chen and H. W. Zhang(Beijing Institute of Aeronautical Materials
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Beijing 100095
,
China Manuscript received 26 August 1996)
金属学报(英文版)
The thin-wall effect of DZ25G, a directionally solidified (DS) superalloy, has been studied by ustng tubular investment cast thin-wall specimens with shape and wall thickness near the air-cooled hollow blades.The results show that the stress-rupture properties of the thin-wall specimens (thickness 0.8, 1.2 and 1.6 mm) are equivalent to the standard ones (diameter 5 mm),i.e., under the experimental conditions in this study the alloy DZ25G has insignificant thin-wall effect. It is apparent that the resulte are different from previous work. In the paper the reasons resulting in the difference were discussion in terms of the specimen manufacture process and thus microstructure feature.
关键词:
:DS superalloy
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