FGH95合金LCF断裂寿命与夹杂特征关系的研究

STUDY OF THE RELATIONSHIP BETWEEN THE LCF LIFE OF FGH95 ALLOY AND THE INCLUSION CHARACTERISTICS

运用无因次分析方法，探讨了夹杂位置 ｄ（夹杂距合金表面距离）、夹杂二维尺寸 Ｓ与 ＦＧＨ９５合金断裂周次Ｎｆ之间的关系．结果表明，非表面夹杂是否处于危险区域－亚表面位置，并不依赖于夹杂的绝对位置 ｄ，而是依赖于 ｄ２／Ｓ的大小．ｄ２／Ｓ＝１是区分亚表面夹杂与内部夹杂的临界点．对于合金中处于随机分布的夹杂，处于合金表面或亚表面位置的可能性依赖于夹杂尺寸的大小．夹杂尺寸越大，处于表面或亚表面的可能性越大．

The relationship between the LCF life of FGH95 alloy and the location and the size of inclusion has been analyzed by non-factor analysis. The results showed that whether the inclusion, which is not existed in alloy surface, locates in dangerous subsurface site is not determined by the parameter d, the distance from the inclusion to the surface of alloy, but the parameter d(2)/S, in which S is two-dimension size of inclusion. d(2)/S=1 is the critical point distinguishing the subsurface inclusion from the internal. For randomly distributing inclusion in alloy, the probability for inclusion locating in the dangerous site of surface or subsurface in the alloy depends on the size of inclusion. The larger the size of inclusion is, the more the inclusion existing in the dangerous site is. It is not probable that more than two inclusion particles with small size present simultaneously in the surface or the subsurface of alloy.