首页> 外文期刊>Journal of Nondestructive Evaluation >13 Stress Assessment in Precipitation Hardened IN718 Nickel-Base Superalloy Based on Hall Coefficient Measurements
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13 Stress Assessment in Precipitation Hardened IN718 Nickel-Base Superalloy Based on Hall Coefficient Measurements

机译:13基于霍尔系数测量的沉淀在沉淀中的应力评估硬化为13 In718镍基超合金

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摘要

The feasibility of residual stress assessment in precipitation hardened IN718 nickel-base superalloy based on Hall coefficient measurement is investigated through studying the influence of thermal hardening, cold work, and applied stress. Measurements in IN718 specimens of various hardness levels show that the Hall coefficient increases from 8 +/- 0.1 x 10(-11) m(3)/C in the fully annealed state of 14 HRC to 9.4 +/- 0.1 x 10(-11) m(3)/C in the fully hardened state of 45 HRC. Measurements in IN718 specimens of various cold work levels show that plastic deformation exerts negligible effect on the Hall coefficient of fully annealed IN718, while in fully hardened IN718 the Hall coefficient decreases more or less linearly with cold work from its peak value of 9.4 +/- 0.1 x 10(-11) m3/C in its intact state to 8.9 +/- 0.1 x 10(-11) m(3)/C in its most deformed state of 22% plastic strain. Measurements taken under applied stress show that elastic strain significantly increases the Hall coefficient of IN718 regardless of the state of hardening. The relative sensitivity of the Hall coefficient to elastic strain is called the galvanomagnetic gauge factor and defined as the ratio of the relative change of the Hall coefficient divided by the axial strain under applied uniaxial stress. The gauge factor of IN718 is in the range of 2.6-2.9 depending on the hardness level. Besides the fairly high value of the gauge factor, it is important that it is positive, which means that compressive stress in surface-treated components decreases the Hall coefficient in a similar way as plastic deformation does, therefore the unfortunate cancellation that occurs in fully hardened IN718 in the case of electric conductivity measurements does not happen in this case. In addition, the influence of thermal exposure up to 700 degrees C and the reversible temperature dependence of the Hall coefficient at room temperature are studied in IN718 at different hardness levels.
机译:通过研究热硬化,冷加工和施加应力的影响,研究了基于霍尔系数测量的基于霍尔系数测量的沉淀在沉淀中硬化的可行性。各种硬度水平In718标本的测量表明,霍尔系数在14小时的完全退火状态下从8 +/- 0.1×10(-11)m(3)/ c增加到9.4 +/- 0.1 x 10( - 11)M(3)/ c在45小时的完全硬化状态下。在各种冷水水平的In718标本中的测量表明,塑性变形对IN718的完全退火的霍尔系数产生了可忽略不计的影响,而在718中,霍尔系数在9.4 +/-峰值的峰值峰值的较低工作中的较低线性减少或多或少地降低。 0.1×10(-11)M3 / c的完整状态为8.9 +/- 0.1×10(-11)m(3)/ c,其最变形的22%塑性应变状态。在应用应力下采取的测量表明,无论硬化状态如何,弹性应变显着增加了IN718的霍尔系数。霍尔系数与弹性应变的相对敏感性称为镀锌磁性计因子,并且定义为霍尔系数的相对变化除以应用单轴应力下的轴向应变的比率。根据硬度水平,IN718的规格因子在2.6-2.9的范围内。除了规格因子的相当高的价值之外,重要的是,它是阳性的,这意味着表面处理的组分中的压缩应力以与塑性变形相似的方式将霍尔系数降低,因此不幸的消除在完全硬化的情况下发生的不幸取消在这种情况下,在电导率测量的情况下,在这种情况下不会发生。此外,在不同的硬度水平的IN718中研究了热曝光高达700℃和霍尔系数的可逆温度依赖性的影响。

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