本文研究了粒状贝氏体组织的低周疲劳性能、冲击疲劳性能及旋转弯曲疲劳性能.结果表明:在等抗拉强度下,粒状贝氏体的低周疲劳性能与冲击疲劳性能均优于回火马氏体组织.且随粒状贝氏体含量增加,冲击疲劳寿命相应提高.粒状贝氏体中的(M-A)岛对疲劳裂纹扩展有阻碍作用,对提高疲劳寿命有利.在等强度下,粒状贝氏体的旋转弯曲疲劳性能和回火马氏体组织相当,疲劳极限(Sf)与屈服强度(σy)和断裂强度(S_K)的关系为: S_f=4.651+0.1411(σ_y+S_K)
The strain fatigue, impact fatigue and rotation beam fatigue behavi-our of granular bainitic structure has been studied. The results show that the strainfatigue properties and the impact fatigue properties of granular bainite are su-perior to that of tempered martensite under the condition that the ultimate tensilestrength is equal. The impact fatigue life increases with increasing amount of gra-nular bainite, because the M-A islands might retard the propagation of fatiguecrack. The rotation beam fatigue properties of granular bainite are similar to thatof tempered martensite. The relationship between fatigue limit S_f, yield strength σ_yand fracture strength S_k may be expressed as S_f=4.651+0.1411 (σ_y+S_k)
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