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JIA Xiankai, TANG Jianqun, GUO Xiaofeng, GONG Jianming. Effects of Aging Time on Microstructure and Mechanical Properties of 20Cr32Ni1Nb Steel[J]. Materials and Mechanical Engineering, 2018, 42(9): 65-68. DOI: 10.11973/jxgccl201809014
Citation: JIA Xiankai, TANG Jianqun, GUO Xiaofeng, GONG Jianming. Effects of Aging Time on Microstructure and Mechanical Properties of 20Cr32Ni1Nb Steel[J]. Materials and Mechanical Engineering, 2018, 42(9): 65-68. DOI: 10.11973/jxgccl201809014
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Effects of Aging Time on Microstructure and Mechanical Properties of 20Cr32Ni1Nb Steel

  • Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, College of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China

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  • Received Date: June 20, 2017
  • Revised Date: July 24, 2018
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    • Abstract
  • 20Cr32Ni1Nb steel was aged at 950 ℃ for different time (200-5 000 h), and the effects of aging time on microstructure and mechanical properties of the steel were studied. The results show that with the increase of aging time, the lamellar structure of eutectic carbides on grain boundaries of the 20Cr32Ni1Nb steel disappeared, and then the structure changed from short rod shape to granular shape gradually. The secondary carbides precipitated from the austenite matrix and diffusely distributed, and the number of secondary carbides was the largest after aging for 500 h. G phase precipitated from 20Cr32Ni1Nb steel when the aging time was 5 000 h. With the increase of aging time, the tensile strength and yield strength of 20Cr32Ni1Nb steel both increased first and then decreased, the elongation decreased, and the impact toughness decreased first, then increased and then decreased. The impact toughness was 40 J·cm-2 after aging for 5 000 h.
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    • References (9)
  • [1]
    WANG X, TANG J, GONG J, et al. Experimental and simulative failure analysis of reformer furnace outlet manifolds serviced in aromatic plant[J]. Engineering Failure Analysis, 2015, 57:350-362.
    [2]
    YAN J, GU Y, DANG Y, et al. Effect of carbon on the microstructure evolution and mechanical properties of low Si-containing centrifugal casting 20Cr32Ni1Nb alloy[J]. Materials Chemistry & Physics, 2016, 175:107-117.
    [3]
    MONOBE L S, SCHÖN C G. Characterization of the cold ductility degradation after aging in centrifugally cast 20Cr32Ni+Nb alloy tube[J]. Radiation Effects and Defects in Solids, 1976, 86(3/4):207-210.
    [4]
    HOFFMAN J J, MAGNAN J. Cast 20Cr32Ni1Nb alloy aged mechanical property improvements via chemistry modifications[C]//2003 Annual Conference and Exhibition. Houston:NACE International, 2003.
    [5]
    KNOWLES D M, THOMAS C W, KEEN D J, et al. In service embrittlement of cast 20Cr32Ni1Nb components used in steam reformer applications[J]. International Journal of Pressure Vessels and Piping, 2004, 81(6):499-506.
    [6]
    CHEN Q Z, THOMAS C W, KNOWLES D M. Characterisation of 20Cr32Ni1Nb alloys in as-cast and ex-service conditions by SEM, TEM and EDX[J]. Materials Science & Engineering:A, 2004, 374(1/2):398-408.
    [7]
    SHI S, LIPPOLD J C. Microstructure evolution during service exposure of two cast, heat-resisting stainless steels-HP-Nb modified and 20-32Nb[J]. Materials Characterization, 2008, 59(8):1029-1040.
    [8]
    DEWAR M P, GERLICH A P. Correlation between experimental and calculated phase fractions in aged 20Cr32Ni1Nb austenitic stainless steels containing nitrogen[J]. Metallurgical and Materials Transactions A, 2013, 44(2):627-639.
    [9]
    GUO X F, GONG J M, GENG L Y. The formation of G phase and in-service embrittlement of the centrifugally cast 20Cr32Ni1Nb alloy[C]//9th China-Japan Bilateral Symposium. Changsha:Changsha University of Science and Technology, 2016.
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