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Acta Metall Sin  2013, Vol. 49 Issue (9): 1081-1088    DOI: 10.3724/SP.J.1037.2013.00198
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PRECIPITATION BEHAVIOR OF M23C6 AND ITS EFFECTS ON DUCTILITY AND TOUGHNESS OF A NOVEL Cr-Mn-N AUSTENITIC HEAT RESISTANT STEEL
ZHENG Leigang, HU Xiaoqiang, KANG Xiuhong, LI Dianzhong
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang110016
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ZHENG Leigang, HU Xiaoqiang, KANG Xiuhong, LI Dianzhong. PRECIPITATION BEHAVIOR OF M23C6 AND ITS EFFECTS ON DUCTILITY AND TOUGHNESS OF A NOVEL Cr-Mn-N AUSTENITIC HEAT RESISTANT STEEL. Acta Metall Sin, 2013, 49(9): 1081-1088.

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Abstract  

Cr-Mn-N austenitic heat resistant steels have bright future in wide applications due to their lower cost, excellent mechanical properties, and outstanding local corrosion resistance after substituting the nickel partly or completely by the Mn, N and C elements. As the content of C or N elements increasing in Cr-Mn-N steels, a large quantity of precipitates form during hot working, resulting in embrittlement of these steels. In the present study, a new Cr-Mn-N austenitic heat resistant steel was aged at temperatures from 600℃ to 1000℃ in duration from 10 min up to 6000 min. By OM, SEM and XRD, the microstructure evolution of precipitates and their effects on ductility and toughness of the studied steel were investigated. The results indicated that precipitates formed during aging were mainly Cr-rich M23C6 carbides, whose morphologies changed in a sequence of intergranular films, lamellae in cellular microstructure and intragranular rods or particles with the increase of aging time and/or temperature. The time-temperature-precipitation (TTP) curves for M23C6 carbides were determined, which have a typical C-shaped profile with a nose temperature between 850℃ and 900℃, and an incubation period not more than 1 min. In addition, it was found out that the aging embrittlement of the studied steel is strongly dependent on the morphology of M23C6 carbides. The intergranular film-shaped M23C6 carbides were considered as the main factor to favor cracks rapidly expanding along grain boundaries, finally resulting in brittle intergranular fracture.

Key words:  Cr-Mn-N austenitic heat resistant steel      M23C6 carbide, cellular microstructure      aging embrittlement     
Received:  17 April 2013     

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00198     OR     https://www.ams.org.cn/EN/Y2013/V49/I9/1081

[1]Berns H. ISIJ Int, 1996; 36: 909
[2]Ikegami Y, Nemoto R. ISIJ Int, 1996; 36: 855
[3]Hannien H, Romu J, Ilola R, Tervo J, Laitinen A.J Mater Process Technol, 2001; 117: 424
[4]Lee T H, Oh C S, Kim S J, Takaki S. Acta Mater,2007; 55: 3649
[5]Reed R P. JOM, 1989; 41: 16
[6]Speidel M O. Materialwiss Werkstofftech, 2006; 37:875
[7]Berns H, Siebert S. ISIJ Int, 1996; 36: 927
[8]Byrnes M L G, Grujicic M, Owen W S. Acta Metall,1987; 35: 1853
[9]Werner E. Mater Sci Eng, 1988; A101: 93
[10]Simmons J W. Mater Sci Eng, 1996; A207: 159
[11]Speidel M O, Pedrazzoli R M. Mater Perform, 1992;31: 59
[12]Rawers I C, White H, Doan R. ISIJ Int, 1996; 36:746
[13]Gavriljuk V G. ISIJ Int, 1996; 36: 738
[14]Ha H Y, Lee T H, Oh C S, Kim S J. Scr Mater, 2009;61: 121
[15]Hsiao C M. Acta Metall Sin, 1958; 3: 138
(肖纪美. 金属学报, 1958; 3: 138)
[16]Li Y K, Hsieh Y H, Kuo Y Y, Shih C H. Acta Metall Sin, 1966; 9: 33
(李有柯, 谢仰华, 郭蕴宜, 师昌绪. 金属学报, 1966; 9: 33)
[17]Kuo Y Y, Liu C L, Li Y K, Shih C H. Acta Metall Sin, 1964; 7: 409
(郭蕴宜, 刘嘉乐, 李有柯, 师昌绪. 金属学报, 1964; 7: 409)
[18]Kuo Y Y. Acta Metall Sin, 1965; 8: 467
(郭蕴宜. 金属学报, 1965; 8: 467)
[19]Chandra Holm H, Uggowitzer P J, Speidel M O. Scr Metall, 1987; 21: 513
[20]Kikuchi M, Kajihara M, Choi S K. Mater Sci Eng,1991; A146: 131
[21]Shi F, Wang L J, Cui W F, Liu C M. Acta Metall Sin (Engl Lett), 2007; 20: 95
[22]Carvalho P A, Machado I F, Solorzano G, Padilha A F.Philos Mag, 2008; 88: 229
[23]Lee T H, Kim S J, Takaki S. Metall Mater Trans,2006; 37A: 3445
[24]Presser R, Silcock J M. Met Sci, 1983; 17: 241
[25]Lee T H, Ha H Y, Kim S J. Metall Mater Trans,2011; 42A: 3543
[26]Matsuoka S, Mangan M A, Shiflet G J. In: Johnson W C, HoweJ W, Laughlin D E, Soffa W A eds., Proc Int Conf on Solid-Solid Phase Transformation, Warrendale, PA: The Minerals, Metals and Materials Society, 1994: 521
[27]Vanderschaeve F, Taillard R, Foct J. J Mater Sci, 1995; 30: 6035
[28]Knutsen R D, Lang C I, Basson J A. Acta Mater,2004; 52: 2407
[29]Santhi Srinivas N C, Kutumbarao V V. Scr Mater,1997; 37: 290
[30]Jiang Z H, Zhang Z R, Li H B, Li Z, Ma Q F. Int JMiner Metall Mater, 2010; 17: 729

[1] LI Bei; WU Shuangxia; TENG Yun; LIU Cuilan; YAN Yuxin; ZHAO Zengqi; WU Hong (Baotou Research Institute of Rare Earth; Ministry of Metallurgical Industry; Baotou 014010). EFFECTS OF CARBON AND YTTRIUM ON 500℃ AGING EMBRITTLEMENT OF ALLOY Fe-15Cr-4Al[J]. 金属学报, 1996, 32(9): 926-932.
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