多轮吞吐热采套管用N80Q钢高温疲劳性能本构模型的建立  

Constitutive Model of High-Temperature Fatigue Performance for N80Q Steel for Multiple Rounds Huff and Puff Thermal Recovery Casing Pipe

作　　者：崔璐[1] 常文权 王澎 徐龙 杨怡 修浩炜 CUI Lu;CHANG Wenquan;WANG Peng;XU Long;YANG Yi;XIU Haowei(School of Mechanical Engineering,Xi'an Shiyou University,Xi'an 710065,China;HYCET V-Leader Engine Technology(Jiangsu)Co.,Ltd.,Yangzhong 212214,China)

机构地区：[1]西安石油大学机械工程学院,西安710065 [2]蜂巢蔚领动力科技(江苏)有限公司,扬中212214

出　　处：《机械工程材料》2025年第4期92-98,共7页Materials For Mechanical Engineering

基　　金：陕西省自然科学基金资助项目(2023-JC-YB-376);陕西省教育厅青年创新团队科研计划项目(23JP127)。

摘　　要：在350℃高温下对热采套管用N80Q钢进行单轴拉伸试验、蠕变试验(应力分别为350,450 MPa)和对称载荷低周疲劳试验(平均应变为0,应变幅分别为1.0%,1.4%,2.0%,3.0%),根据试验数据确定材料参数,构建了Chaboche黏塑性本构模型,并采用平均应变为0.5%的非对称载荷低周疲劳试验进行了验证。结果表明:根据单轴拉伸曲线、疲劳初始曲线以及蠕变曲线确定了弹塑性参数,根据对称载荷作用下的滞回曲线确定了随动强化参数、等向强化参数和损伤阶段参数;当循环次数为半循环寿命时,应变幅分别为1.0%,1.4%,2.0%,3.0%下,构建的本构模型模拟与非对称载荷低周疲劳试验所得试验钢最大应力之间的相对误差分别为4.10%,3.15%,3.10%,0.87%,相对误差在5%之内,说明模型准确。Uniaxial tensile tests,creep tests(stress of 350,450 MPa)and symmetrical load low cycle fatigue tests(average strain of 0,strain amplitude of 1.0%,1.4%,2.0%,3.0%)were carried out on N80Q steel for thermal recovery casing pipe at 350℃.The material parameters were determined according to the test data.The Chaboche viscoplastic constitutive model was constructed and verified by asymmetric load low cycle fatigue tests with average strain of 0.5%.The results show that the elastoplastic energy parameters are determined according to the uniaxial tensile curve,fatigue initial curve and creep curve.The dynamic strengthening parameters,isotropic strengthening parameters and damage stage parameters were determined according to hysteretic curves under symmetrical loads.When the cycle number was half-cycle life and the strain amplitude was 1.0%,1.4%,2.0%,3.0%,the relative error between the maximum stress of the test steel obatained by constructed constitutive model simulation and by the asymmetric load low cycle fatigue test was 4.10%,3.15%,3.10%,0.87%,respectively,which were all below 5%,showing that the model was accurate.

关 键 词：热采井 N80Q钢 本构模型 疲劳 蠕变 

分 类 号：TG115.5[金属学及工艺—物理冶金]