ばね鋼の腐食耐久性評価方法とその応用
1998 年 1998 巻 43 号 p. 37-42
詳細
1998 年 1998 巻 43 号 p. 37-42
In this paper, the, experimental method for evaluating a corrosive mode of spring steels to meet with the real usage of car, and the statistic approach for avaluating a corrosive pit characteristic, were studied.
The studies were also extended to the influence of alloy elements and shot peering to corrosive fatigue strength.
It was found that these approaches may have some possibility to predict corrosive fatigue strength, as described below.
1) The corrosive pit characteristic can be improved by adding Cu, Ni and Cr to spring steels.
2) The proposed statistic approach by using the estimated value of pit dimension can evaluate corrosive pit characteristic of spring steels quantitatively.
3) The shot peering process can improve corrosive fatigue strength for the residual stress can restrain crack propagation at the bottom corrosive pit.
4) It can be realized the prediction of corrosive fatigue strength may become possible by applying the estimated value of pit dimension to Murakami's ewuation.
