SUS304鋼の高温材料特性に対する予ひずみ効果

概要

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The effects of pre-strain on the tensile,creep,and low-cycle fatigue properties of type 304 stainless steel at elevated temperatures have been investigated to evaluate the fabrication induced cold work effect on the properties of structural materials. The tensile pre-strain was introduced in the test specimens at room temperature at plastic strain levels as high as 15% for tensile tests,10% for creep tests,and 5%for fatigue tests. The results obtained are as follows; (1) The 0.2% offset yield strength, ultimate tensile strength, and creep rupture strength increased with increasing pre-strain. This creep strength improvement is caused by the decrease of steady-state creep rate. (2) Little difference in the low-cycle fatigue life was observed between the base metal and the pre-strained specimens. This is due to the disappearance of the pre-strain effect by cyclic harde-ning under fatigue conditions. (3) Tensile and creep rupture ductilities decreased. with increasing pre-strain. However, the reduction in fracture elongation due to pre-strain appears to be almost equivalent to the amount of pre-strain. Therefore, pre-straining causes no additional decrease in creep ductility in long term tests.
社団法人日本材料学会の論文
1986-11-15