δ相对Inconel 625合金管材组织及性能的影响（英文）
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摘要
通过冷变形及时效处理来调控Inconel 625合金中δ相的含量、分布及形貌,采用XRD、SEM和EDS表征δ相的特征,研究了δ相对Inconel 625合金管材组织及性能的影响。研究表明,随着冷变形量的增加,合金的平均晶粒尺寸减小,晶粒变形均匀性逐渐变好,合金的硬度增加;δ相首先在形变孪晶界、晶界及变形带上析出,随后在晶内析出,针状的δ相在晶内呈近正交状或网格状分布,而在变形带上平行排列;随着冷变形量的增加,δ相的形貌由针状转变为短棒状或颗粒状;合金的平均晶粒尺寸随着冷变形量的增加和保温时间的延长而减小;当冷变形量为35%时,合金的硬度随保温时间的延长而增加,而冷变形量超过50%时合金的硬度没有发生明显的变化。
The amount, distribution and morphology of δ phase in Inconel 625 superalloy were controlled by cold deformation and aging treatment. The characteristic of δ phase was characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM) and energy dispersive spectrometer(EDS). The influence of δ phase on the microstructure and properties of Inconel 625 superalloy tubes was investigated. The results show that the average grain size decreases, the deformation uniformity of the grain becomes better gradually, and the hardness increases, with the increase of cold deformation(ε). The δ phase firstly precipitates at the deformation twin and grain boundaries as well as deformation bands, and then precipitates within the grains. The precipitation of needle δ phase is oriented in two near-orthogonal directions or a lattice-like distribution within the grain, while oriented in two parallel directions at the deformation bands. With the increase of cold deformation, the morphology of δ phase varies gradually from needle to spheroid or short rodlike. The average grain size of the alloy decreases with the increase of cold deformation and the extension of aging time(t). The hardness of the alloy increases with the extension of aging time when the cold deformation is 35%, but there is no obvious change in the hardness of the alloy with the extension of aging time as the cold deformation is more than 50%.
The amount, distribution and morphology of δ phase in Inconel 625 superalloy were controlled by cold deformation and aging treatment. The characteristic of δ phase was characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM) and energy dispersive spectrometer(EDS). The influence of δ phase on the microstructure and properties of Inconel 625 superalloy tubes was investigated. The results show that the average grain size decreases, the deformation uniformity of the grain becomes better gradually, and the hardness increases, with the increase of cold deformation(ε). The δ phase firstly precipitates at the deformation twin and grain boundaries as well as deformation bands, and then precipitates within the grains. The precipitation of needle δ phase is oriented in two near-orthogonal directions or a lattice-like distribution within the grain, while oriented in two parallel directions at the deformation bands. With the increase of cold deformation, the morphology of δ phase varies gradually from needle to spheroid or short rodlike. The average grain size of the alloy decreases with the increase of cold deformation and the extension of aging time(t). The hardness of the alloy increases with the extension of aging time when the cold deformation is 35%, but there is no obvious change in the hardness of the alloy with the extension of aging time as the cold deformation is more than 50%.
引文
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2 Shoemaker L E.Superalloys[C].Warrendale,PA:TMS,2005:409
3 Shankar V,Rao K B S,Mannan S L.J Nucl Mater[J],2001,288:222
4 Ahmad M,Akhter J I,Shahzad M et al.J Alloy Compd[J],2008,457(1-2):131
5 Thomas C,Tait P.Int J Pres Ves Pip[J],1994,59(1-3):41
6 Eiselstein H L,Tillack D J.Superalloys[C].Warrendale,PA:TMS,1991:1
7 Sundararaman M,Kumar L,Prasad G E et al.Metall Mater Trans A[J],1999,30(1):41
8 Tarzimoghadam Z,Rohwerder M,Merzlikin S V et al.Acta Mater[J],2016,109:69
9 Belan J.Mater Today Proceedings[J],2016,3(4):936
10 Kirman I,Warrington D H.Metall Trans A[J],1970,1:2667
11 Sundararaman M,Mukhopadhyay P,Banerjee S.Metall Trans A[J],1988,19(3):453
12 Cortial F,Corrieu J M,Vernot-Loier C.Metall Mater Trans A[J],1995,26(5):1273
13 Suave L M,Cormier J,Villechaise P et al.Metall Mater Trans A[J],2014,45:2963
14 Di X J,Xing X X,Wang B S.Acta Metall Sin[J],2014,50(3):323(in Chinese)
15 Ding Y T,Gao Y B,Dou Z Y et al.Acta Metall Sin[J],2017,53(6):695(in Chinese)
16 Liu D X,Zhang X,Qin X Q et al.Mater Sci Technol[J],2017,33(14):1610
17 Ma M Y,Chang T J,Gu Z G.Phys Exam Text[J],1990(1):5(in Chinese)
18 Yang L,Dong J X,He Z Y et al.Journal of University of Science and Technology Beijing[J],2012,32(4):410(in Chinese)
19 Floreen S,Fuchs G E,Yang W J.Superalloys[C].Warrendale,PA:TMS,1994:13
20 Liu W C,Xiao F R,Yao M et al.Scripta Mater[J],1997,37(1):53
21 Liu W C,Yao M,Chen Z L.Metall Mater Trans A[J],1999,30(1):31
22 Liu W C,Xiao F R,Yao M et al.J Mater Sci Letters[J],1997,16(9):769
23 Peng C H,Chang H,Hu R et al.J Aeronaut Mater[J],2011,31(2):8(in Chinese)
24 Song W X.Metallic[M].Beijing:Metallurgical Industry Press,2014:142(in Chinese)
25 Guo T B,Ding Y T,Yuan X F et al.Chin J Nonferrous Met[J],2011,21(2):384(in Chinese)
26 Huang C X,Yang G,Gao Y L et al.Mater Sci Eng A[J],2008,485(1-2):643
27 Liu W C,Chen Z L,Xiao F R et al.Acta Aeronaut Astronaut Sin[J],1999,20(3):279(in Chinese)
28 Liu W C,Yao M,Xiao F R et al.Iron and Steel[J],1997,32(5):55(in Chinese)
29 Liu W C,Yao M,Chen Z L et al.J Mater Sci[J],1999,34(11):2583
30 Cahn J W.Acta Metall Sin[J],1962,10:907(in Chinese)
31 Smith C S.Trans Met Soc AIME[J],1948,175:15
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