Surface improvement using a vibratory cavitation (Improvement in fatigue strength)

疲劳试验是在表面暴露于振动空化的钢试件上进行的。试验材料为普通结构用轧钢SS400和奥氏体不锈钢SUS304。对于SS400光滑和缺口试件，由于在表面处理过程中形成了腐蚀坑，疲劳强度保持不变。经表面处理的SUS304试件的疲劳强度比未处理试件提高了15%。U型缺口SUS304试件经处理后疲劳寿命延长约4倍。

The fatigue tests were carried out on steel specimens whose surface was exposed to vibratory cavitation. The test materials were a rolled steel for general structure, SS400, and an austenitic stainless steel, SUS304. For SS400 smooth and notched specimens, the fatigue strength kept unchanged because corrosion pits were formed during surface treatment. The fatigue strength of SUS304 surface treated specimen increased by 15 percent, as compared with that of untreated specimen. The fatigue life of U-notched SUS304 specimen was extended by about 4 times by the treatment.