A Comparative Study on the Microstructures and Mechanical Properties of Two Kinds of Iron-Based Alloys by WAAM

Xia, Yu-feng; Chen, Yanhong; Peng, Mengxia; Teng, Haihao; Zhang, Xue

doi:10.1007/s11595-022-2551-x

Cited by 1 publication

(1 citation statement)

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“…CHN327 alloy is a Ni70Drl15 heat-resistant alloy electrode with a low hydrogen coating that has excellent high-temperature stability, good wear resistance, and corrosion resistance [ 10 ]. Research investigations have been carried out on its microstructure and mechanical properties, but less attention has been paid to modeling the flow behavior and fracture failure [ 11 ]. Furthermore, understanding the failure mechanisms and modes of the “skin” layer material under high temperatures and heavy loads is also a key question that needed to be solved.…”

Section: Introductionmentioning

confidence: 99%

Study of Flow Stress Models and Ductile Fracture Criteria for CHN327 Nickel-Based Superalloy

Xia

Yang

et al. 2023

Materials

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The plastic deformation behavior of a CHN327 nickel-based superalloy under temperatures ranging from 600 °C to 700 °C and strain rates ranging from 0.001 to 0.1 s−1 was investigated using uniaxial high-temperature tensile tests. The stress–strain curves obtained by the tests showed that the maximum stress decreased as the temperature increased, while it increased as the strain rate increased. Based on the extensive data obtained in the experiment, three constitutive models (Hollomon, Swift, and the modified Voce equation) were employed to predict the constitutive relation. It was found that the modified Voce equation had the highest correlation coefficient and the best prediction accuracy. Thereafter, in order to predict the fracture of CHN327 during high-temperature tensile deformation, five ductile fracture criteria (Freudenthal, C&L, Brozzo, Ayada, and the R&T model), and the modified Voce equation obtained were incorporated into the finite element software (DEFORM). According to the results, except for the C&L and Brozzo models, all of the other ductile fracture criteria (DFCs) were suitable for predicting the damage distribution of the CHN327 alloy in tensile tests. For all of the DFCs considered, the R&T model provided the most accurate predictions, whose mean error was only 8.9%, far less than the values that other models predicted.

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Section: Introductionmentioning

confidence: 99%