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Chinese Journal of Materials Research  2016, Vol. 30 Issue (11): 819-824    DOI: 10.11901/1005.3093.2015.624
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Effect of Aging Process on Strength and Toughness of AerMet100 Steel
Xin WANG,Hongbo DONG(),Daqing YUAN,Zongbo ZOU,Mingzhu WANG
Nanchang Hangkong University, Nanchang 330063, China
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Xin WANG, Hongbo DONG, Daqing YUAN, Zongbo ZOU, Mingzhu WANG. Effect of Aging Process on Strength and Toughness of AerMet100 Steel. Chinese Journal of Materials Research, 2016, 30(11): 819-824.

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Abstract  

The effect of aging processes on the tempered microstructure and mechanical properties of the forged AerMet100 steel was investigated, while the named processes include normal aging, pre-aging + normal aging and double aging etc. The results show that high tensile strength (1978 MPa) with low impact toughness (AK=74 J) can be obtained by the normal aging process; higher impact toughness (impact energy 102 J) can be obtained by double aging process, but tensile strength is lower (1662 MPa); however, excellent strength and toughness (σb=1946 MPa; AK=104 J) can be obtained by pre aging + normal aging (510℃×30 min, OQ+482℃×5 h, AC) process. The improvment of strength and toughness can be attribute to that the 510℃ pre aging could promote the C atom diffusion, therewith increased the amount and the stability of the flim-like reversed austenite; besides enable the M2C precipitate to maintain a good lattice relationship with the matrix induced by the short time (≤30 min) pre aging, therefore the precipitation strengthening effect was enhanced.
Key words:  metallic materials      secondary hardening steel      pre aging      mechanical property      reversed austenite      precipitation strengthening     
Received:  03 December 2015     
Fund: *Supported by the National Natural Science Foundation of China No. 51164029, Aeronautical Science Foundation of China No.2015ZE56011, Science Project of Jiangxi Province No.20151BBE50042.
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Xin WANG
Hongbo DONG
Daqing YUAN
Zongbo ZOU
Mingzhu WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.624     OR     https://www.cjmr.org/EN/Y2016/V30/I11/819

C Ni Cr Mo Co Ti Al Mn S P O N Si Fe
0.23 11.73 3.13 1.25 13.85 0.01 0.01 <0.01 0.001 0.006 0.001 0.001 0.0002 Bal.
Table 1  Composition of AerMet100 steel (mass fraction, %)
Aging techniques Cryogenic and aging process
No.1 Normal aging -73℃×1 h, AC+482℃×5 h, AC
No.2 Pre aging + Normal aging 510℃×10 min, OQ+ -73℃×1 h, AC+482℃×5 h, AC
No.3 510℃×30 min, OQ+ -73℃×1 h, AC+482℃×5 h, AC
No.4 -73℃×1 h, AC+510℃×10 min, OQ+482℃×5 h, AC
No.5 -73℃×1 h, AC+510℃×30 min, OQ+482℃×5 h, AC
No.6 Double aging -73℃×1 h, AC+510℃×5 h, OQ+300℃×5 h, AC
Table 2  Heat treatment scheme of AerMet100 steel (OQ, oil quenching; AC, air cooling)
σb/MPa σ0.2/MPa δ / % φ/ % Ak/J
No.1 1978 1810 13.4 65 74
No.2 1975 1910 12.4 65 84
No.3 1922 1856 11.7 67 90
No.4 1941 1872 12.3 65 77
No.5 1946 1885 11.9 66 104
No.6 1662 1550 10.7 70 102
Table 3  Mechanical properties of AerMet100 steel after different aging process
Fig.1  Impact fracture of Aermet100 steel treated with different aging techniques (a)(d) Normal aging No.1; (b)(e) Pre aging No.5; (c)(f) Double aging No.6; (g) Pre aging No.2; (h) Pre aging No.3
Fig.2  XRD pattern of Aermet100 steel with different aging techniques
Fig.3  The equilibrium phases of AerMet100 steel isothermal at 200~600℃ calculated by thermodynamic software (a) volume fraction of phase vs temperature, (b) element of Austenite vs temperature
Fig.4  Bright-field image of reverted austenite after aging process (a) Normal aging No.1 (b) Pre aging+ Normal aging No.5
Fig.5  Bright-field image of precipitate M2C after Pre aging + Normal aging
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