Proportion of Transformation Superplasticity and Expansion on Stress Releasement

概要

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The effect of the transformation superplasticity (that is a martensite transformation) on the stress releasement has been examined. By use of the new apparatus (a restraint thermal cycle test) by which the displacement of only the transformed part of the spiecmen can be measured and the new composite specimen of which the test 9%-Ni steel is joined by friction welding to SUS304 stainless steel on the both ends, the proportion between transformation superplasticity and transformation expansion on the amount of the stress releasement was quantitatively examined. The results are shown as follows; 1) The expansion by only transformation superplasticity was separated from whole expansion during transformation by use of the new apparatus and specimen. 2) When much amount of thermal stress is generated in spite of a small transformed area, the stress releasement during transfomation chiefly occurs by transformation superplasticity. 3) Regarding as stress releasement in the midst of cooling just after transformation start, it mainly occurs by superplasticity because of its high thermal stress. But, in the latter half of the transformation, the stress releases mainly by transformation expansion.
社団法人溶接学会の論文
1993-10-01