金属材料高温拉伸试验控制模式及试验速率的选择  

Control Mode for Tensile Test of Metallic Materials at High Temperature and Its Selection of Testing Rates

作　　者：孙绍广 周勃 王青 许磊 杜群力 倪旭 SUN Shaoguang;ZHOU Bo;WANG Qing;XU Lei;DU Qunli;NI Xu(State Key Laboratory of Material for Marine Equipment and Application,Anshan 114009,Liaoning,China;Ansteel Iron&Steel Research Institutes,Anshan 114009,Liaoning,China;Equipment and Engineering Department of Angang Steel Co.,Ltd.,Anshan 114009,Liaoning,China)

机构地区：[1]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114009 [2]鞍钢集团钢铁研究院,辽宁鞍山114009 [3]鞍钢股份有限公司设备工程部,辽宁鞍山114009

出　　处：《鞍钢技术》2024年第2期38-44,共7页Angang Technology

摘　　要：对GB/T 228.2—2015金属材料高温拉伸试验标准中的方法A和方法B从控制模式、试验速率要求两方面进行了分析解读,选用不同方法和速率从应力-应变曲线、应变速率-时间曲线、屈服强度三方面分析,并对分析设定不同试验速率进行验证。结果表明,采用引伸计反馈控制实施方法A1,实际应变速率波动超差,应力-应变曲线易发生畸变,对Rp0.2的测试结果造成误判;采用横梁位移反馈控制实施方法A2和方法B,选择合适的试验速率,测定参数的应变速率能够满足标准要求,可以获得稳定可靠的应力-应变曲线和较为一致的试验结果。The Method A and the Method B from the standard GB/T 228.2—2015 for tensile test of metal materials at high temperature were analyzed based on two requirements asked by control mode and testing rate.And then three aspects such as stress-strain curves,strain rate-time curves and yield strengths were analyzed by different methods and testing rates,and the analysis results were verified based on various testing rates.And thus it was concluded that Method A1 from the extensometer feedback control could produce a larger deviation on strain rates and the stress-strain curves were apt to get aberrations,which would make miscalculation on Rp0.2.While Method A2 and Method B from the beam displacement feedback control could meet the requirements asked by the standard for strain rates,which could achieve stable and reliable stress-strain curves and uniform results.

关 键 词：高温拉伸试验 应变速率 控制模式 屈服强度 

分 类 号：TG142.15[一般工业技术—材料科学与工程]