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Home > Archive>Volume 54, Issue 1, 2025 >39-49. DOI:10.12442/j.issn.1002-185X.20240506
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Effect of Aging Treatment on Properties and Post-weld Microstructure of Stainless Steel Containing Niobium
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1.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;2.Gansu Jiu Steel Group Hongxing Iron & Steel Co., Ltd, Jiayuguan 735100, China

Fund Project:

Science and Technology Program Project of Gansu Province (21ZD3GB001)

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    Abstract:

    The effects of different aging processes on the precipitated phase, mechanical properties, molten salt corrosion resistance and post-weld microstructure of 347H stainless steel were studied. The results show that a large number of precipitated phases appear in the crystal after aging at 700 °C for 400 h. After aging for 3000 h, the number of precipitated phases increases and most of them are gathered at the grain boundaries. There are two forms of precipitates, one is the coarse precipitate rich in Cr, and the other is the smaller precipitates mainly consisting of NbC. After aging at 700 °C for 30 min, the yield strength and tensile strength of the samples at room temperature and 593 °C increase, but the elongation decreases. The corrosion results in nitrate at 565 °C show that the corrosion products of the aged samples are the same as that of the original samples, which are Fe2O3, Fe3O4, MgCr2O4, MgFe2O4, FeCr2O4 and NaFeO2. The proportion of Fe3O4 that is dense and well bonded to the subtrate in the original sample is higher than that in the aged sample, so the corrosion resistance is better. At 700 °C, the aging time has no obvious effect on the microstructure after welding.

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[Liu Tianzeng, Zhao Yanchun, Chen Anzhong, Yu Zhiqi, Feng Li, Li Jucang, Pan Jixiang. Effect of Aging Treatment on Properties and Post-weld Microstructure of Stainless Steel Containing Niobium[J]. Rare Metal Materials and Engineering,2025,54(1):39~49.]
DOI：10.12442/j. issn.1002-185X.20240506

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History
  • Received:August 11,2024
  • Revised:October 12,2024
  • Adopted:October 15,2024
  • Online: January 24,2025
  • Published: January 20,2025

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