산업기술연구 (Journal of Industrial Technology)
- 제18권
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- Pages.203-208
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- 1998
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- 1229-9588(pISSN)
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- 1598-1371(eISSN)
피로한도의 정량평가법과 구상흑연주철에 대한 적용
Quantitative Evaluation for Fatigue Limit and its Application to Spheroidal Graphite Cast Iron
초록
Fatigue tests were performed to examine the 4 parameter method for specimens prepared by various heat treatment which resulted in different mechanical properties. Obtained main results are as follows. (1) Samples treated by austempering did not show the expected improvement of fatigue limit although hardness and strength increased. This is attributed to the fact that defect sensitivities of materials increase as increasing of hardness and tensile strength, it is also shown that the graphites acting as stress concentration place become larger by austempering heat treatment than by normal annealing. (2) It is very reasonable to predict the fatigue limit of ductile irons with 4 parameter method based on