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Chinese Journal of Materials Research  2016, Vol. 30 Issue (11): 841-847    DOI: 10.11901/1005.3093.2015.478
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Microstructure and Precipitates of Alloy 617B Used for 700℃ Advanced Ulta-supercritical Power Units
Yan GUO(),Caixia WANG,Taijiang LI,Shufang HOU,Bohan WANG
Xi’an Thermal Power Research Institute Co., Ltd, Xi’an 710032, China
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Yan GUO, Caixia WANG, Taijiang LI, Shufang HOU, Bohan WANG. Microstructure and Precipitates of Alloy 617B Used for 700℃ Advanced Ulta-supercritical Power Units. Chinese Journal of Materials Research, 2016, 30(11): 841-847.

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Abstract  

The microstructure and precipitates of the creep-ruptured and aged alloy 617B at 750oC were characterized by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM).The polygonal (or strip-type) M23C6 particles with a complex face-centered cubic (fcc) structure locate along grain boundaries and inside grains, and granular γ ′ phase particles with an ordered fcc-structure inside grains were observed during creep and aging. The precipitates grown up with test time. The comparative observation of the aged and creep-ruptured alloy samples revealed that the applied stress did not affect the growth of γ ′ phase obviously, but affect the precipitation of carbides at grain boundaries greatly. The stress leads to the sharp growth and agglomation of M23C6 particles after a long time creep test.
Key words:  metallic materials      alloy 617B      creep      aging      precipitate      stress     
Received:  20 October 2015     
Fund: *Supported by Research and Development Fund of TPRI No.TN-15-TYK05.
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Yan GUO
Caixia WANG
Taijiang LI
Shufang HOU
Bohan WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.478     OR     https://www.cjmr.org/EN/Y2016/V30/I11/841

Element Co Fe Ti Al B Cu N Pb As Sn
A 12.00 0.97 0.41 0.84 0.006 0.02 / 0.0004 0.0008 0.0009
B 11.93 1.04 0.39 0.93 0.004 0.02 0.005 < 0.0005 < 0.01 /
ASME 11.0-13.0 ≤1.5 0.25-0.5 0.8-1.3 0.001-0.005 / / / / /
Element C Si Mn Cr Mo Ni P Bi S Sb
A 0.06 0.15 0.01 21.90 8.90 54.80 0.007 0.0002 0.0008 0.002
B 0.061 0.10 0.01 21.90 8.80 54.72 0.003 < 0.001 0.0012 /
ASME 0.05-0.08 <0.3 <0.3 21.0-23.0 8.80-10.0 balance < 0.012 / < 0.008 /
Table 1  Chemical composition of Alloy 617 B (mass fraction, %)
Fig.1  Fractographs of creep-rupture samples (a-b) 750℃/170 MPa/591 h, (c-d) 750℃/120 MPa/4764 h
Fig.2  Secondary cracks of creep-rupture samples in SEM images (a) 750℃/170 MPa/591 h, (b) 750℃/120 MPa/4764 h
Fig.3  TEM images and SAED patterns of the alloy tested for 591 h at 750oC and a stress of 170 MPa (a) polygonal M23C6, (b) strip-type M23C6
Fig.4  TEM images and SAED patterns of the alloy aged for 300 h at 750℃: (a-b) intragranular M23C6 and γ ′ phase
Fig.5  TEM images and SAED patterns of the alloy tested for 1237 h at 750oC and a stress of 150 MPa (a) strip M23C6 beside grains, (b) granular γ ′ phase
Fig.6  TEM images and SAED patterns of the alloy aged for 1000 h at 750℃ (a) intragranular M23C6 and γ ′ phase, (b) intragranular γ ′ phase, dislocation
Fig.7  TEM images and SAED patterns of the alloy tested for 4764 h at 750oC and a stress of 120 MPa (a-b) γ ′ phase and M23C6 beside grains, (c) intergranular M23C6
Fig.8  TEM images and SAED patterns of the alloy aged for 5000 h at 750℃ (a) intragranular M23C6 and γ ′ phase, (b) intergranular M23C6
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