J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (11): 1300-1307.DOI: 10.1016/j.jmst.2016.06.026
• Orginal Article • Previous Articles Next Articles
Ou Meiqiong1,2, Ma Yingche1,3,*(), Hao Xianchao1, Wan Baifang3, Liang Tian1, Liu Kui1
Received:
2016-05-03
Revised:
2016-06-07
Accepted:
2016-06-14
Online:
2017-11-20
Published:
2018-01-25
Contact:
Ma Yingche
About author:
1 These two authors contributed equally to this paper.
Ou Meiqiong, Ma Yingche, Hao Xianchao, Wan Baifang, Liang Tian, Liu Kui. Effect of Solution Annealing on Microstructure and Mechanical Properties of a Ni-Cr-W-Fe Alloy[J]. J. Mater. Sci. Technol., 2017, 33(11): 1300-1307.
Fig. 1. (a) Variations of average grain size after different solution treatments; (b) changes of average grain size of SA, AT, and stress-ruptured samples.
Fig. 2. OM images of (a) AT sample; (b) 750 °C, 320 MPa stress-rupture sample; (c) 750 °C tensile sample; and (d) room temperature tensile sample. All samples were heat treated at 1100 °C for 1 h and 760 °C for 16 h.
Fig. 3. Grain size distributions of SA, AT, room temperature tensile, 750 °C tensile and stress-rupture samples. SA sample was heat treated at 1100 °C for 1 h; other samples were heat treated at 1100 °C for 1 h and 760 °C for 16 h.
Fig. 4. (a, b) Carbides were observed by SEM in two different locations of AT sample; (c) morphology and (d) the inset selected area electron diffraction of carbides; (e) TEM image shows γ′ phases in the same AT sample.
Fig. 5. (a) γ′ phase of AT samples subjected to 1100 °C/1h+760 °C/16 h; (b-f) γ′ phase of 750 °C/320 MPa stress-rupture samples, which were prior to solution annealing at (b) 1020 °C, (c) 1050 °C, (d) 1080 °C, (e) 1100 °C, (f) 1150 °C for 1 h plus the same age treatment at 760 °C for 16 h, respectively.
Fig. 8. (a) Yield strengths and ultimate tensile strengths and (b) elongation and reduction of area of RT and 750 °C tensile samples as a function of SA temperature.
Fig. 10. Fracture surfaces of (a) RT tensile, (b) 750 °C tensile and (c) 750 °C/320 MPa stress-rupture samples. All samples were heat treated at 1100 °C for 1 h and 760 °C for 16 h.
Fig. 11. Lamellar M23C6 carbides of (a) 750 °C tensile, (b) RT tensile samples after heat treatment (1100 °C/1 h and 760 °C/16 h); lamellar M23C6 carbides of 750 °C/320 MPa stress-rupture samples after heat treatment at (c) 1020 °C and (d) 1100 °C for 1 h plus 760 °C for 16 h.
Fig. 12. Micro-cracks and precipitate free zones of stress rupture samples at grain boundaries after different heat treatments: (a, b, d) 1100 °C for 1 h and 760 °C for 16 h; (c, e, f) 1150 °C for 1 h and 760 °C for 16 h.
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