313 塑性加工製品の疲労信頼性に及ぼす加工ひずみの影響

概要

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Pre-straining effects on fatigue strength of TRIP-aided multiple phase steel was studied from microstructural viewpoint in order to evaluate fatigue reliability of mechanical product after plastic working process. Effects of pre-strain were examined by comparing two types of specimen : one was cut from 10% pre-strained TRIP steel sheet, the other was untreated virgin material. The pre-strained material ensured a 20% improvement in the fatigue strength over the virgin material. Both of pre-strained and virgin specimens were broken with ductile fracture appearance as well as uniaxial tensile fracture, Difference of fatigue strength between two types of materials was closely related to the deformation behavior during cyclic loading. The improvement of fatigue strength could be explained in the following factor associated with the microstructure of TRIP steel : (a) connected configuration of hard phase in microstructure, (b)γ-phase transformation induced plasticity be pre-straining, and (c) origination of compressive residual stress in α-phase by pre-straining.
一般社団法人日本機械学会の論文
2002-08-23