熔体处理对DZ40M返回合金力学性能的影响

来源期刊：金属学报2010年第12期

论文作者：杨金侠 郑启 桑志茹 郎海霞 孙晓峰 胡壮麒

文章页码：1511 - 1516

关键词：返回合金； 熔体处理； 持久性能； 蠕变性能

Key words：reverted alloy； melting treatment； stress-rupture property； creep property

摘    要：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.

Abstract: 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.