螺栓材料1Cr10NiMoW2VNbN的应力松弛行为及预测模型

Stress Relaxation Performance and Prediction Models for Bolt Material of 1Cr10NiMoW2VNbN

为了研究和预测国产螺栓材料1Cr10NiMoW2VNbN的长时应力松弛性能,对该材料进行了应力松弛试验。研究了环境温度、初应力对松弛行为的影响;分析了利用Hook-Norton模型、广义Maxwell模型、Logistic模型以及多项式模型进行长时数据外推的可行性。结果表明:温度对螺栓松弛行为影响最大,实验数据难以推断应力松弛极限存在;所建立的双对数多项式模型可以较好地外推松弛剩余应力。

Stress relaxation tests of the newly developed bolt alloy 1Cr10NiMoW2VNbN were carried out in order to investigate and predict its long-term relaxation performance. Effects of the environment temperature and primary stress on the relaxation performance were discussed. Based on the experimental results, the applicability of Hook-Norton model, generalized Maxwell relaxation model, logistic model and polyno- mial model for the extrapolation of residual stress was reexamined. Results indicate that temperature is the dominating contributor for the relaxation performance of bolt material. According to the experimental results in this paper, stress relaxation limit of the newly developed, bolt alloy ICr10NiMoW2VNbN is still unavailable. Compared to the experimental data, the developed polynomial relaxation model can lead to an appropriate extrapolation of the remaining stress.