Abstract
This investigation has been conducted to make clear the effect of strain rates on the internal structure and the mechanical properties of rapidly stretched stainless steels. The 18%Cr-8%Ni stainless steel and 17%Cr-4%Ni PH stainless steel specimens have been used in this study.The main results obtained are as follows:(1) The yield strength and the tensile strength of these stainless steels in rapid tensile testing are larger than those in static tensile testing. The strain rate gives a remarkable effect on the resistance in deformation of these stainless steels.(2) The yield strength, the tensile strength and the hardness of rapidly pre-stretched 18%Cr-8%Ni stainless steel are larger than those of statically pre-stretched sort. It was recognized that this fact is mainly due more to the promoting martensite transformation by rapid pre-stretching than by static one.(3) The yield strength, the tensile strength and the hardness of statically pre-stretched 17%Cr-4%Ni PH stainless steel are larger than those of rapidly pre-stretched sort. It seems that this fact is mainly due more to the promoting aging by static pre-stretching than by rapid one.(4) From the above mentioned results, it is recognized that the mechanical properties of prestretched stainless steels are remarkably affected by the internal structure caused by the strain rate in pre-stretching.
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