Effect of Precipitation on Hot Deformation Behavior and Processing Maps of Nickel-Base UNS N10276 Alloy

doi:10.1007/s40195-017-0635-y

Abstract

Abstract:

The hot deformation characteristics and processing maps of aged nickel-base UNS N10276 alloy were investigated and compared with those of solution-treated UNS N10276 alloy at temperatures of 950-1250 °C and strain rates between 0.01 and 10 s^-1. The dominant precipitated phase in the aged alloy was identified as topologically close-packed (TCP) μ phase enriched in Mo and Ni. The precipitates present in the UNS N10276 alloy could significantly facilitate flow softening after peak stress at temperatures lower than 1150 °C and strain rates higher than 0.01 s^-1. Processing maps at true strains of 0.1-0.9 were developed using the dynamic materials model and experimental flow stress data. Although aging treatment slightly shrank the suitable hot working window of this alloy, the aged alloy showed higher peak efficiencies of power dissipation and smaller unstable regions in comparison with solution-treated alloy. Furthermore, aging treatment eliminated the instability region of processing maps at true strains of 0.2-0.5. The precipitated phase promoted dynamic recrystallization (DRX) by the particle-stimulated nucleation (PSN) mechanism, which resulted in the larger fraction of DRX as well as finer and more uniform grain structure in the aged alloy specimens compared to the solution-treated alloy.

Key words: UNS N10276 alloy, Precipitation, Hot deformation, Processing map

En-Xiang Pu, Wen-Jie Zheng, Zhi-Gang Song, Han Feng, Han Dong. Effect of Precipitation on Hot Deformation Behavior and Processing Maps of Nickel-Base UNS N10276 Alloy[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(11): 1119-1134.

Figures/Tables 15

Fig. 1 Starting microstructures of a the solution-treated (ST), b the aged (STA) UNS N10276 alloys

Fig. 2 Thermodynamic equilibrium stability and mole fraction of phases in UNS N10276 alloy between 500 and 1500 °C a, the higher magnification b

Fig. 3 a SEM image of the aged UNS N10276 alloy, b typical EDS spectra of precipitates

Fig. 4 TEM micrographs and selected area electron diffraction pattern of the precipitates in UNS N10276 alloy aged at 870 °C for 24 h

Fig. 5 EPMA elemental mapping of UNS N10276 alloy aged at 870 °C for 24 h: a SEM image; distribution maps of b Cr element, c Mo element, d W element, e Fe element, f C element

Fig. 6 True stress-true strain curves for the solution-treated (ST) and aged (STA) UNS N10276 alloys under different strain rates

Fig. 7 IQ maps of the solution-treated (ST) UNS N10276 alloy deformed at a 950 °C, 0.01 s-1; b 950 °C, 1 s-1; c 950 °C, 10 s-1; d 1000 °C, 1 s-1; e 1000 °C, 10 s-1; f 1050 °C, 1 s-1

Fig. 8 IQ maps of the aged (STA) UNS N10276 alloy deformed at a 950 °C, 0.01 s-1; b 950 °C, 1 s-1; c 950 °C, 10 s-1; d 1000 °C, 1 s-1; e 1000 °C, 10 s-1; f 1050 °C, 1 s-1

Table 1 DRX fraction (in pct.) of ST and STA alloys deformed at different temperatures and strain rates

Strain rate (s^-1)	Temperature (°C)
Strain rate (s^-1)	950	1000	1050	1100	1150	1200	1250
0.01	30.8/41.9	34.9/49.8	51.3/57.2	75.2/80.2	86.8/85.9	73.9/76.4	71.7/73.3
0.1	12.5/50.7	39.9/58.3	53.2/64.3	73.7/88.8	89.6/90.1	90.3/92.5	90.4/90.7
1	17.3/30.4	32.4/55.4	52.1/62.5	65.1/75.8	75.9/83.5	87.5/89.2	90.5/91.5
10	39.5/55.6	42.9/50.3	56.5/68.7	62.8/70.4	65.7/83.3	84.2/86.1	87.4/88.3

Fig. 9 Contour map of fraction of DRX for a the solution-treated (ST), b aged (STA) UNS N10276 alloys under different deformation conditions. The contour numbers represent fraction of DRX expressed in pct

Fig. 10 Processing maps of the solution-treated (ST) UNS N10276 alloy at true strains of a 0.1, b 0.2, c 0.3, d 0.4, e 0.5, f 0.6, g 0.7, h 0.8, i 0.9

Fig. 11 Processing maps of the aged (STA) UNS N10276 alloy at true strains of a 0.1, b 0.2, c 0.3, d 0.4, e 0.5, f 0.6, g 0.7, h 0.8, i 0.9

Table 2 Different domains in the processing maps of ST and STA alloys

Alloys	Domains	Temperature (°C)	Strain rate (s^-1)	Efficiency (η) %
ST	A _s (stable region)	1000-1220	0.07-2.2	30-49
	B _s (instability region)	1035-1250	0.01-0.06	≤0
	C _s (instability region)	950-1180	5-10	≤0
STA	A _a (stable region)	1025-1220	0.07-2.5	30-58
	B _a (instability region)	1050-1195	0.01-0.058	≤0
	C _a (instability region)	950-1183	5.6-10	≤0

Fig. 12 IQ maps of the solution-treated (ST) UNS N10276 alloy deformed at a 1100 °C, 0.1 s-1; b 1150 °C, 0.1 s-1; c 1150 °C, 1 s-1; d 1150 °C, 10 s-1; e 1200 °C, 0.01 s-1; f 1200 °C, 0.1 s-1; g 1200 °C, 1 s-1; h 1250 °C, 0.01 s-1; i 1250 °C, 1 s-1

Fig. 13 IQ maps of the aged (STA) UNS N10276 alloy deformed at a 1100 °C, 0.1 s-1; b 1150 °C, 0.1 s-1; c 1150 °C, 1 s-1; d 1150 °C, 10 s-1; e 1200 °C, 0.1 s-1; f 1200 °C, 1 s-1; g 1250 °C, 0.01 s-1; h 1250 °C, 0.1 s-1; i 1250 °C, 1 s-1

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