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.
Reverted DZ40M alloy was refined by melting treatment (MT) which tensile, stress–rupture and creep properties were measured. MT can reduce the content of N from 0.0078% to 0.0024%, as well as the content of S from 0.0015% to 0.0007%. It makes impurity elements such as N, O and S being removed, and the shrinkage area being decreased. MT improves the tensile strength and ductility of reverted DZ40M alloy, especially elongations at room temperature and 1000 ℃ are increased about twice as high as those by regular melting (RM). In addition MT prolongs the stress–rupture lives, and improves the creep properties of reverted DZ40M alloy. Therefore stress–rupture and creep properties of reverted DZ40M alloys are upgraded greatly.
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