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Microstructure and Impact Toughness Property of API X90 Heat-Affected Zones at Different Peak Temperatures

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Abstract

The objective of this paper is to study the effect of peak temperature on the microstructure and impact toughness property in the simulated heat-affected zones (HAZs) of American Petroleum Institute (API) X90 pipeline steel. Simulated HAZs were produced at different peak temperatures (Tp) from 650 to 1350 °C with a heat input of 25 kJ/cm. With a decreasing Tp, the grains become significantly refined, and the granular bainite (GB) increases at the expense of lath bainite (LB). When the peak temperature is 1350 °C, the crack initiator martensite/austenite (M/A) constituents are coarse and distribute along the prior austenite grain boundaries with a short rod-shaped morphology, while the coarse grain heat-affected zone (CGHAZ) has the lowest impact energy of 269.67 J. The subcritical HAZ (Tp=650 °C) has a similar microstructure to the base material and has the best impact energy of 336.33 J. When Tp = 950 °C, LB disappears, and the grains become refined due to complete recrystallization, resulting in a higher toughness property than that at Tp = 850 °C. The lowest microhardness occurs at Tp = 850 °C because of the coarsening of precipitates and some PF.

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Authors and Affiliations

  1. School of Engineering, Southwest Petroleum University, Nanchong, 637800, China

    Liang Wang & Peishan Zhou

  2. Patent Examination Cooperation Sichuan Center of the Patent Office, CNIPA, Chengdu, 610500, China

    Yiwen Hu

  3. School of New Energy and Materials, Southwest Petroleum University, Chengdu, 610500, China

    Bin Wang

  4. Welding Engineering Technology Research Center in Sichuan Province, Chengdu, 610500, China

    Liang Wang & Bin Wang

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  1. Liang Wang
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  2. Peishan Zhou
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Correspondence to Bin Wang.

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Wang, L., Zhou, P., Hu, Y. et al. Microstructure and Impact Toughness Property of API X90 Heat-Affected Zones at Different Peak Temperatures. J. of Materi Eng and Perform 30, 5787–5798 (2021). https://doi.org/10.1007/s11665-021-05827-9

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  • DOI: https://doi.org/10.1007/s11665-021-05827-9

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