Metals and Materials International ( IF 3.3 ) Pub Date : 2021-07-20 , DOI: 10.1007/s12540-021-00992-x Heriberto Granados-Becerra 1 , Víctor H. López-Morelos 1 , Alberto Ruiz 1 , Rafael García-Hernández 1 , Francisco F. Curiel-López 1 , Martin R. Barajas-Alvarez 1
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The Ramberg–Osgood equation was applied to model the stress–strain behavior of heat-treated and welded specimens of Inconel 600 up to 0.2 and 0.175 mm/mm of strain, respectively. As-received and aged plates of Inconel 600 were gas metal arc welded to simulate repair of a component in operation. Dog bone shape specimens were tensile tested at a cross head speed of 0.005 s−1 and the deformation was measured with an extensometer with a gage length of 20 mm. Microstructural observations were made in the optical and scanning electron microscope. Fitting the experimental data in the plastic region of stress–strain curves to a novel three slopes Ramberg–Osgood model enabled estimation of the hardening coefficient, n. The value of n varied from 0.07 to 0.3 depending on the metallurgical condition of the specimen. A notorious increase was observed in the value of n for samples heat-treated beyond 25 h and in as-welded samples. The results of this work showed a very good correlation between the model and the experimental curves.
Graphic Abstract
中文翻译：
时效处理和焊接对具有三阶段应变硬化行为的 IN600 影响的 Ramberg-Osgood 应力-应变分析
Ramberg-Osgood 方程用于模拟 Inconel 600 热处理和焊接试样的应力 - 应变行为，分别高达 0.2 和 0.175 mm/mm 的应变。Inconel 600 的原样和老化板采用气体保护金属电弧焊，以模拟运行中部件的修复。以0.005 s -1的十字头速度对狗骨形状试样进行拉伸测试，并用标距长度为20 mm的引伸计测量变形。在光学和扫描电子显微镜中进行微观结构观察。将应力-应变曲线塑性区的实验数据拟合到新的三斜率 Ramberg-Osgood 模型中，可以估计硬化系数n。n的值取决于试样的冶金条件，从 0.07 到 0.3 不等。观察到热处理超过 25 小时的样品和焊接样品的n值显着增加。这项工作的结果表明模型与实验曲线之间具有很好的相关性。
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