Creep Performance Prediction Method Through Short-term Stress Relaxation Tests

It was analyzed that the intrinsic limitation of present accelerated creep test methods,especially creep design method through stress relaxation tests with an exceeding pre-strain to elastic-strain.A set of short term stress relaxation tests of 1Cr10NiMoW2VNbN steel were carried out.Based on the relationship between stress relaxation and creep,the creep strain rate corresponding to the steady state creep stage were achieved through the stress relaxation test by using numerical analysis and a cross-plotting approach.And then,the second stage creep curves were constructed for high temperature strength design.An integrated accelerated creep test methodology through stress relaxation tests was therefore established.Results of creep tests indicate that the developed method can lead to a good agreement with the experimental data and thus is recommended in the creep performance prediction and strength design of high temperature components.