ばね鋼の破壊じん性に関する研究
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概要
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Fracture toughness has become a useful means to evaluate the toughness of spring steels in a region of high hardness. For example, the coil springs for automotive suspension have a tendency to become harder so as to prevent them from sagging, where in such a hard region the impact test is difficult to apply for its poor accuracy. Thus, the evalyation of the toughness should be made by fracture toughness test for hard tempered spring steels.The present study concerned with the fracture toughness of the spring steels specified JIS (Japanese Industrial Standards) and the experimental steels with addition of Cr and other well known elements to SUP 6 and SUP 7. Of specified spring steels, SUP 10, Cr-V steel showed the highest fracture toughness, leaving both of SUP 9A and SUP 11A lowest. The addition of Cr into a high silicon steel such as SUP 7 was found to impair the fracture toughness in a drastic way, but the content of Si between 1.6 to 2.5% in Si-Mn steel had no effect on the fracture toughness.
- 日本ばね学会の論文
日本ばね学会 | 論文
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