球状黒鉛鋳鉄の高サイクル疲労挙動 : 第1報,オーステンパ処理材の疲労強度に及ぼす試験片寸法および採取位置の影響

概要

論文の詳細を見る
Rotating bending fatigue tests were conducted on an austempered ductile iron (ADI) and a pearlitic iron (PDI) used for comparison purpose. Effects of specimen size, slicing location of specimen in casted block and material microstructure on the fatigue strength of both materials were examined. In addition, fatigue behavior was studied in each specimen through metallographic and fractographic observation. The fatigue strength of both materials were hardly influenced by the location of specimen collection, except the result of the material ADI at higher cyclic stress amplitude. Furthermore, both the materials indicated no size effect relevant to the fatigue strength. Concerning the microscopic aspect of the fatigue behavior, a non-propagating crack initiated at an defect was observed on each specimen, except the large-sized specimen of the material ADI, when the stress amplitude of the fatigue limit was repeated. In the fatigue range of stress cycles over 10^7, a defect as small as the size of the spheroidal graphite particle induced in some cases fatigue failure in both materials.
一般社団法人日本機械学会の論文
1990-11-25