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
• Orginal Article • Previous Articles Next Articles
Tao Liu1, Mei Yang1, Jun-Song Wang2, Jia-Sheng Dong3(), Li Wang3(), Lang-Hong Lou3
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.
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.
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Element | Mo | Cr | Fe | C | Si | Mn | Ti?+?Al?+?Ta | Ni |
---|---|---|---|---|---|---|---|---|
Content (wt%) | 16 | 7 | 4 | 0.04 | 0.45 | 0.5 | <?2 | Bal. |
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. 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
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 |
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. 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
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