Cu-Ni-Zn-Mn弹性合金的疲劳与断口分析

Fatigue and Fracture Characteristics of Cu-Ni-Zn-Mn Spring Alloys

研究了微量元素对 Ｃｕ － １５ Ｎｉ － １３ Ｍｎ － ２８ Ｚｎ 弹性合金疲劳性能的影响。结果表明： 添加微量元素①０ ．１ Ｔｉ＋ ０ ．１ Ｚｒ ＋ ０ ．１８７ Ａｌ ＋ ０ ．０１３ Ｃｅ ＋ ０ ．２４ Ｆｅ ＋ ０ ．１ Ｂ； ②０ ．０４ Ｃｅ ＋ ０ ．００３ Ｂ；③０ ．５ Ｔｉ；④０ ．５ Ｚｒ（ ｗ／ ％ ） 可提高合金的低周疲劳寿命。以②形式添加，效果较显著。断口分析表明，合金低周疲劳断口的主要特征是平行的条纹及韧窝。

Effects of trace elements on the low-cycle fatigue properities of Cu-15Ni-13Mn-28Zn elastic alloy have been investigated. The fatigue fracture and fatigue crack were observed using SEM. The results showed that adding (1)0.187Al+0.013Ce+0.24Fe+0.1B+0.1Ti+0.1Zr (2)0.04Ce+0.003B (3)0.5Ti (4)0.5Zr improved the low-cycle fatigue life. And adding(2) is most effective. The chief character of fracture is fatigue striation and dimple.