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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导到显著提高.
The results of tensile test, tensile test and creep test show that the melt treatment reduced the content of N in the feed from 0.0078% to 0.0024 %; S content from 0.0015% down to 0.0007%. Melting treatment also reduces the content of impurities in the alloy and inclusions, reducing the micro-loose alloy area. Compared with the conventional process, the melt treatment increased DZ40M returns the strength and elongation of the alloy, especially at room temperature and 1000 ° C more than doubled the elongation of the melt treatment to extend the life of the alloy to improve the creep properties of the alloy, so that the alloy DZ40M long-term creep Performance has been significantly improved.