SUS 304鋼の高温疲労特性に及ぼすふん囲気の影響

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The effect of environment on high temperature fatigue properties of 304 stainless steel was studied. Strain-controlled low-cycle fatigue tests were conducted with a symmetrical and an asym-metrical strain--wave forms at 700゜ and 800℃ in air and vacuum. The results were analyzed and the partitioned strain-life relations Δε_<ij>-N_<ij> were determined by the strain-range partitioning a p proach. The main results obtained in this study are as follows : (1) Δε_<pp>-N_<pp> and Δε_<cc>-N_<cc> properties are sensitive to environmental effects while not Δε_<pc>-N_<pc> and Δε_<cp>-N_<cp> Properties. (2) Each of Δε_<ij>-N_<ij> Properties in air and vacuLun is insensitive to the test temperature. (3) Δε_<pp>-N_<pp> and Δε_<cc>-N_<cc> Properties in vacuum can be estimated by the Manson-Coffim equa-tions as follows : Δε_<pp> =D_p^<0.6>N_<pp>^<-0.6> (D_p= -1n(1-ψ_p)), Δε_<cc> =D_c^<0.6>N_<cc>^<-0.6> (D_c= -1n(1-ψ_c)) where ψ_p and ψ_c are the values of the reduction in area during tensile and creep rupture test, respectively. (4) When Δε_<pp> or Δε_<cc>-type of strain is cycled, a crack tends to initiate at the specimen surface and grow to the final failure. This fact is probably the main reason of the remarkable effect of environment on partitioned fatigue life N_<pp> or N_<cc>. (5) On the other hand, the reason of no environmental effects on Δε_<pc>-N_<pc>. and Δε_<cp>-N_<pc> Is probably due to the fact that the specimen failure is caused by the tensile failure mode when Δε_<pc>-type of strain is cycled and by the coalescence or connection of grain-boundary cracks inside the specimen when Δε_<cp>-type of strain is cycled.
社団法人日本材料学会の論文
1979-05-15

SUS 304鋼の高温疲労特性に及ぼすふん囲気の影響

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