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Study on hot deformation behavior and strengthening mechanism of Inconel 625 deposited metal at high temperature

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Abstract

In order to research the hot deformation of Inconel 625 deposited metal, the Inconel 625 flux-cored wire was surfaced on carbon steel by GMAW. The true stress–strain curves of the deposited metal were obtained by high-temperature tensile test at temperatures of 600–900 °C and strain rate of 8.33 × 10−5 s−1. The tensile fracture morphology and microstructure were observed by OM, SEM, XRD and TEM, and the thermal deformation behavior and strengthening mechanism of the Inconel 625 deposited metal were analyzed. The results show that the longitudinal section of the tensile fracture of specimen can be judged to be mainly composed of γ austenite, MC and Laves phase at different temperatures. And the flow stress decreases with the increase of temperature. The tensile stress–strain curves of the specimens show obvious work-hardening behavior after yielding at RT, 600 °C and 700 °C, while it decreases obviously, and the stress basically maintains a constant at 760 °C, 800 °C and 900 °C. When the temperature is 700 °C, the plasticity of the sample has a low valley, that is medium temperature brittleness. Inconel 625 deposited metal is divided into three stages by Arrhenius relation: the low-temperature zone (T ≤ 600 °C), the medium-temperature zone (600 °C < T ≤ 760 °C) and the high-temperature zone (T > 760 °C). In the low-temperature zone, it consists of a/2 < 110 > dislocation pairs cutting the precipitates or continuous cutting matrix channel and stacking faults of precipitates (continuous stacking fault). The strengthening mechanism is dominated by dislocations cutting γ-phase. With the increase of temperature, some dislocation bands and loops appear in the microstructure, and the dislocation bypass mechanism (Orowan mechanism) has been initiated; in the medium-temperature zone, the complex dislocation reactions occur and form dislocation locks and tangles at 700 °C; it is a mixed mechanism of dislocation cutting and bypassing; in the high-temperature zone, a large number of dislocation loops appear in the microstructure, and some irregular dislocation networks can be observed. With the increase of temperature, the dislocation networks become more regular. It shows that the bypass mechanism of dislocation is the main deformation mechanism.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, China

    Yunhai Su, Zhiyong Dai, Taisen Yang, Yingdi Wang, Xuewei Liang & Xinggang Wu

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Contributions

YHS helped in conceptualization, supervision, methodology, project administration, and writing-review and editing. ZYD was involved in conceptualization, methodology, investigation, validation, data curation, and writing-original draft. TSY helped in data curation and investigation. YDW contributed to data curation, methodology, and investigation. XWL was involved in methodology and validation. XGW helped in investigation and resources.

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Correspondence to Yunhai Su.

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Su, Y., Dai, Z., Yang, T. et al. Study on hot deformation behavior and strengthening mechanism of Inconel 625 deposited metal at high temperature. J Mater Sci 56, 16745–16761 (2021). https://doi.org/10.1007/s10853-021-06357-4

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