Abstract
In the last paper, authors reported that the torsional working temperature has a remarkable influence on the torsional creep limit of a plain 18-8 stainless steel. Through the present investigation, measurement of torsional creep limit of a 18-8 Cb Stainless steel bar (5mmφ×50mm) austenized and twisted to a degree of 0.128π/cm or 0.256π/cm was made at 500 and 600°C, and then hardness and micrographic testing and X-ray analysis were carried out. These results obtained are summalized as follows:Torsional creep limit of a 18-8 Cb stainless steel is not so much affected by the torsional working temperature of -60∼800°C as in case of the creep limit of plain 18-8 stainless steel.In this 18-8 Cb stainless steel, it was found that the effects of torsional working temperature on the difference of the hardness before and after creep testing and also on the precipitation mode of Cb-carbide (CbC) were small.
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