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Acta Metall Sin  2017, Vol. 53 Issue (2): 239-247    DOI: 10.11900/0412.1961.2016.00356
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Effect of Heat Treatment on Microstructure and Mechanical Properties of Consecutive Point-Mode Forging and Laser Rapid Forming GH4169 Alloy
Mingzhe XI(),Wei ZHOU,Junying SHANG,Chao LV,Zhenhao WU,Shiyou GAO
Key Laboratory of Advanced Forging & Stamping Technology and Science, Ministry of Education, Yanshan University, Qinhuangdao 066004, China
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Mingzhe XI,Wei ZHOU,Junying SHANG,Chao LV,Zhenhao WU,Shiyou GAO. Effect of Heat Treatment on Microstructure and Mechanical Properties of Consecutive Point-Mode Forging and Laser Rapid Forming GH4169 Alloy. Acta Metall Sin, 2017, 53(2): 239-247.

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Abstract  

To transform the columnar grain in the as-deposited GH4169 alloy to the exquiaxed grain and get better mechanical properties, a block sample of GH4169 alloy has been formed by using a technology of consecutive point-mode forging and laser rapid forming (CPF-LRF). During the process of CPF-LRF, GH4169 alloy was deposited by laser rapid forming firstly and then the deposited GH4169 alloy was deformed by consecutive point-mode forging. Both consecutive point-mode forging and laser rapid forming were alternately carried out until the completion of the forming of an objective part. The effects of heat treatment on the microstructures and mechanical properties of CPF-LRF GH4169 alloy have been investigated. The result shows that 980STA heat treatment fails to lead to recrystallization of CPF-LRF GH4169 alloy, and the tensile properties of 980STAed CPF-LRF GH4169 alloy can't meet the wrought standards. After the 1020STA heat treatment, the average recrystal grain size of GH4169 alloy is about 12.8 μm, and Laves phase can not be dissolved completely. The tensile properties of the 1020STAed CPF-LRF GH4169 alloy is superior to the wrought standards. Compared to the 1020STAed CPF-LRF GH4169 alloy, the tensile strength of 1050STAed CPF-LRF GH4169 alloy drops and its ductility increases due to complete dissolution of Laves phase and grain size increasing to 25.3 μm. The average grain size of the 1080STAed CPF-LRF GH4169 alloy is about 123.6 μm. Compared to 1020STAed and 1050STAed CPF-LRF GH4169, the tensile properties of 1080STAed CPF-LRF GH4169 has fallen substantially, which just satisfy the wrought standards.
Key words:  consecutive point-mode forging      laser rapid forming      GH4169 alloy      microstructure      tensile property     
Received:  02 August 2016     
Fund: Supported by National Natural Science Foundation of China (Nos.51375426 and 51375245)
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Mingzhe XI
Wei ZHOU
Junying SHANG
Chao LV
Zhenhao WU
Shiyou GAO

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00356     OR     https://www.ams.org.cn/EN/Y2017/V53/I2/239

Powder Fe Cr Ti Al Mo Nb C Ni
GH4169 18.4 19.7 1.04 0.64 3.0 5.17 0.33 Bal.
AMS：5663 16~20 17~21 0.65~1.15 0.1~0.8 2.8~3.3 4.75~5.5 0.08Max Bal.
Table 1  Chemical composition of GH4169 powders (mass fraction / %)
Designation Heat treatment
980STA 980 ℃, 1 h, AC+720 ℃, 8 h →2 h620 ℃, 8 h, AC
1020STA 1020 ℃, 1 h, AC+980 ℃, 1 h, AC+720 ℃, 8 h→2 h620 ℃, 8 h, AC
1050STA 1050 ℃, 1 h, AC+980 ℃, 1 h, AC+720 ℃, 8 h→2 h620 ℃, 8 h, AC
1080STA 1080 ℃, 1 h, AC+980 ℃, 1 h, AC+720 ℃, 8 h→2 h620 ℃, 8 h, AC
Table 2  Heat treatments for CPF-LRF GH4169 alloy
Fig.1  Schematic of technical process of CPF-LRF
Fig.2  Microstructures and EDS analyses of CPF-LRF GH4169 alloy heat treated by 980STA
(a) columnar crystals (b) Laves phase and δ phase
(c) EDS analysis of Laves phase pointed by arrow 1 in Fig.2b
(d) EDS analysis of δ phase pointed by arrow 2 in Fig.2b
Fig.3  Microstructures and EDS analysis of CPF-LRF GH4169 alloy heat treated by 1020STA
(a) equiaxed crystals and annealing twins (b) precipitation of δ phase
(c) Laves phase and δ phase (d) EDS analysis of Laves phase pointed by arrow in Fig.3c
Fig.4  Microstructures of equiaxed crystals (a, c) and precipitation (b, d) of δ phase of CPF-LRF GH4169 alloy heat treated by 1050STA (a, b) and 1080STA (c, d)
Fig.5  Microhardness of CPF-LRF GH4169 alloy after 980STA, 1020STA, 1050STA and 1080STA heat treatments
Heat treatment σs / MPa σb / MPa Elongation / %
980STA 1120.1 1361.3 10.1
1020STA 1301.6 1523.4 16.4
1050STA 1235.4 1447.6 19.8
1080STA 1112.2 1362.1 12.4
Wrought standard (Q/3B 548-1996) 1100.0 1340.0 12.0
Table 3  Tensile properties of GH4169 alloy under different heat treatments
Fig.6  Tensile fracture morphologies of CPF-LRF GH4169 alloy after different heat treatments
(a) 980STA (b) 1020STA (c) 1050STA (d) 1080STA
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