Effect of Heat Treatment on Microstructure and Stress Rupture Properties of a Ni-Mo-Cr-Fe Base Corrosion-Resistant Superalloy

doi:10.1007/s40195-018-0837-y

Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (1): 116-126.DOI: 10.1007/s40195-018-0837-y

Special Issue: 2018-2019高温合金专辑； 2019年腐蚀专辑-2；高温合金 2019-2020

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Effect of Heat Treatment on Microstructure and Stress Rupture Properties of a Ni-Mo-Cr-Fe Base Corrosion-Resistant Superalloy

Tao Liu¹, Mei Yang¹, Jun-Song Wang², Jia-Sheng Dong³(), Li Wang³(), Lang-Hong Lou³

1.Jiangsu University of Technology, Changzhou 213001, China
2.Harbin Engineering University, Harbin 150001, China
3.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received:2018-07-09 Revised:2018-09-01 Online:2019-01-20 Published:2019-01-18
Contact: Dong Jia-Sheng,Wang Li
About author:
Author brief introduction:Dao-Kui Xu Professor of IMR, CAS, and “Young Merit Scholar” of Corrosion Center in the Institute of Metal Research (IMR), Chinese Academy of Sciences (CAS). He achieved Ph.D. degree from IMR, CAS, in 2008, during which he obtained “Chinese Academy of Sciences-BHP Billiton” Scholarship award, “Shi Changxu” Scholarship award and “Zhu-LiYueHua” Excellent Doctorate Student Scholarship of Chinese Academy of Sciences. He worked as a Research Fellow in ARC Center of Excellence, Design of Light Metals, Department of Materials Engineering, Monash University, Australia (2008.10-2011.10). He published more than 60 peer-reviewed scientific papers, attended 20 invited lectures and holds seven patents. His papers were cited more than 1200 times. His research interests mainly include: (1) fatigue behavior and fracture toughness of light metals, such as Mg, Al and Ti alloys; (2) effects of alloying, heat treatment and thermomechanical processes on the microstructural evolution and mechanical improvement of light metals; (3) corrosion, stress corrosion cracking and corrosion fatigue behavior of lightweight alloys; and (4) design of new lightweight alloys with a good balance of properties in terms of mechanical property and corrosion resistance.

Abstract

Abstract:

The influences of heat treatment and test condition on the microstructure and stress rupture properties of a Ni-Mo-Cr-Fe base corrosion-resistant superalloy have been investigated in this paper. Optical microscope and scanning electron microscope were employed for the microstructure observation, and X-ray diffraction, electron probe micro-analyzer, and transmission electron microscope were used for phase determination. It was found that the grain size increased and the volume fractions of initial M₆C carbides decreased along with the increase in solution treatment temperature. When tested at 650 °C/320 MPa, the stress rupture lives decreased with the increase in solution treatment temperature, but the stress rupture lives increased slightly at first and then decreased for the samples solution heat treated at 1220 °C when tested at 700 °C/240 MPa. The elongations showed the descendent trends under these two conditions. The stress rupture life and elongation for the aged samples all showed a noticeable improvement at 650 °C/320 MPa, but there was no noticeable improvement at 700 °C/240 MPa. The reasons can be attributed to the grain size, test conditions, and the initial and secondary carbides.

Key words: Corrosion-resistant superalloy, Heat treatment, Stress rupture properties, Secondary carbides

Tao Liu, Mei Yang, Jun-Song Wang, Jia-Sheng Dong, Li Wang, Lang-Hong Lou. Effect of Heat Treatment on Microstructure and Stress Rupture Properties of a Ni-Mo-Cr-Fe Base Corrosion-Resistant Superalloy[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(1): 116-126.

Figures/Tables 13

Table 1 Nominal chemical composition of the experimental alloy (wt%)

Element	Mo	Cr	Fe	C	Si	Mn	Ti?+?Al?+?Ta	Ni
Content (wt%)	16	7	4	0.04	0.45	0.5	<?2	Bal.

Fig. 1 Microstructure of the as-forged GH3535 alloy: a SEM image, b the TEM photographs with SAED pattern of the initial carbides inserted

Fig. 2 Grains of the specimens after different heat treatments: a as-forged, b 1140 °C/1 h, c 1180 °C/1 h, d 1220 °C/1 h, e 1180 °C/1 h?+?900 °C/2 h, f the grain size changes with heat treatment

Fig. 3 Carbide morphology of the alloys under different heat treatment states: a as-forged, b 1140 °C/1 h, c 1180 °C/1 h, d 1220 °C/1 h, e 1180 °C/1 h?+?900 °C/2 h, f volume fractions of primary carbides in the alloys with different heat treatment histories

Fig. 4 X-ray diffraction patterns of a as-forged, b solution heat-treated and c aged samples

Fig. 5 Carbides precipitated along the grain boundaries in the 900 °C aged specimens: the morphology of the carbides and its SAED pattern

Fig. 6 EPMA results of the 900 °C aged specimen: a BEI image and the area distribution of b C, c Si, d Mo, e Cr, f Fe, g Ta, h Mn

Table 2 Quantitative elemental analysis of primary and secondary carbides of aged alloy (at%)

Elements (at%)	C	Si	Mo	Ni	Cr	Fe
Primary carbide	13.05	9.01	36.98	31.04	5.79	2.15
Secondary carbide	7.52	11.73	39.02	37.94	1.75	1.28

Fig. 7 Influence of heat treatment history on a stress rupture life, b elongation at 650 °C/324 MPa and 700 °C/241 MPa

Fig. 8 Fracture morphologies of the samples tested at 650 °C/324 MPa: a, f, k as-forged, b, g, l 1140 °C/1 h, c, h, m 1180 °C/1 h, d, i, n 1220 °C/1 h, e, j, o 1180 °C/1 h?+?900 °C/2 h. a-e Fracture surfaces, f-o morphologies near the fracture surface on the transverse section

Fig. 9 Fracture morphologies of the samples tested at 700 °C/240 MPa: a, f, k As-forged, b, g, l 1140 °C/1 h, c, h, m 1180 °C/1 h, d, i, n 1220 °C/1 h, e, j, o 1180 °C/1 h?+?900 °C/2 h. a-e Fracture surface, f-o morphology near the fracture surface on the transverse section

Fig. 10 Cross section images of the samples with different heat treatment histories after creep tests: a As-forged, b 1140 °C/1 h, c 1180 °C/1 h, d 1220 °C/1 h, e 1180 °C/1 h?+?900 °C/2 h, tested at 650 °C/320 MPa; f As-forged, g 1140 °C/1 h, h 1180 °C/1 h, i 1220 °C/1 h, j 1180 °C/1 h?+?900 °C/2 h, tested at 700 °C/240 MPa

Fig. 11 Distribution of grain size: a As-forged, b 1140 °C/1 h, c 1180 °C/1 h, d 1220 °C/1 h

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Effect of Heat Treatment on Microstructure and Stress Rupture Properties of a Ni-Mo-Cr-Fe Base Corrosion-Resistant Superalloy

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