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通过高温试验装置在模拟井下工况温度25～350℃范围内进行了316L不锈钢的拉伸试验。结合拉伸试验数据、拉伸后微观结构以及断口形貌对316L不锈钢的25～350℃范围内的拉伸变形行为进行了探讨。应用温加工变形理论,建立了316L不锈钢在井下温度场环境中的形变本构方程。基于拉伸试验数据,计算了应变速率因子Z,变形激活能Q,建立了316L不锈钢温变形过程的流变应力计算模型,为完井设计中膨胀管膨胀施工提供了参考依据。
The tensile test of 316L stainless steel was carried out in a simulated temperature range of 25 ~ 350 ℃ by the high temperature test equipment. Tensile deformation behavior of 316L stainless steel in the temperature range of 25 ~ 350 ℃ was discussed based on tensile test data, tensile microstructure and fracture morphology. Based on the theory of warm deformation, the deformation constitutive equation of 316L stainless steel in downhole temperature field was established. Based on the tensile test data, the strain rate factor Z and the deformation activation energy Q were calculated. The flow stress calculation model of 316L stainless steel during temperature deformation was established, which provided a reference for expansion pipe expansion in well completion design.