High Temperature Strength of Commercially Pure Titanium and Pure Zirconium

概要

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We obtained the following results from the short-time tensile test, creep-rupture test and fatigue test on the high temperature properties of the commercially pure titanium and zirconium:(1) Commercially pure titanium has a comparatively higher strength considering its small specific gravity, and a comparatively higher yield strength considering its tensile strength.(2) Commercially pure titanium has a unique creep property in the range of 200°C to 300°C with the existence of limit stress in creep test at the said temperature range. The same tendency occurs in commercially pure zirconium, but it is not so remarkable as in titanium.(3) The fatigue limit of commercially pure titanium in the high temperature fatigue test tends to decline sharply in the temperature range of room temperature up to 200°C and then gradually in the temperature range of 200°C to 400°C by temperature elevation, as the decline tendency by temperature elevation of the short-time tensile strength.(4) The unique creep property of commercially pure titanium in the temperature range of 200°C to 300°C is proved to be the result from strain aging, which causes the decline by temperature elevation of the short-time tensile strength to become slow in the temperature range of 250°C to 500°C.
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