Tensile Properties of Cast Alloy IN625 in Relation to d Phase Precipitation

doi:10.1007/s40195-018-0772-y

Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (4): 535-540.DOI: 10.1007/s40195-018-0772-y

• Orginal Article • Previous Articles

Tensile Properties of Cast Alloy IN625 in Relation to d Phase Precipitation

Yi-Qiang Mu^1,², Chang-Shuai Wang¹, Wen-Long Zhou², Lan-Zhang Zhou¹()

1 Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, China
2 School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China

Received:2018-03-26 Revised:2018-04-22 Online:2019-04-10 Published:2019-04-19
Contact: Zhou Lan-Zhang
About author:
Dr. Kun-Kun Deng was born in 1983 and was awarded Ph. D in Harbin University of Technology in 2011. After graduation, he worked in the College of Materials Science and Engineering, Taiyuan University of Technology. At the same time, he continued his research work on the design, fabrication and processing of advanced Mg-based material in. Now, he is the vice chairman of Youth Committee in Magnesium Alloy Branch of Chinese Materials Research Society. He was denoted as young academic pacemaker of Shanxi Province in 2018. He has held two projects of National Nature Science Foundation of China, one project of Specialized Research Fund for the Doctoral Program of Higher Education, one Project of International Cooperation in Shanxi and two projects of Natural Science Foundation of Shanxi. He has published more than 60 articles. The time cited is more than 840 (without selfcitations), and the H-index is 22. In addition, he has published one academic monograph and acquired eight Chinese patents.

Abstract

Abstract:

The relationship between the tensile properties and δ (delta) phase precipitation in cast alloy IN625 was investigated in this paper. Although the influences of δ phase on the mechanical properties have been pointed out in our previous work, the relationship is still not directly determined due to the coexistence of γ″ (gamma double prime) and δ precipitates. In order to exclude the effect from γ″ phase, various fractions of δ precipitates with few γ″ precipitates were obtained by a set of experimental alloys aging at 750 °C, and tensile tests were conducted in parallel. The results showed that both yield strength and ultimate tensile strength increased nearly in linear with increasing δ phase fraction, while the elongation was relatively and limitedly affected by δ precipitation when the area fraction of δ phase was above 10%.

Key words: δ Phase;, Cast alloy IN625, Tensile properties, Advanced ultra-supercritical (AUSC)

Yi-Qiang Mu, Chang-Shuai Wang, Wen-Long Zhou, Lan-Zhang Zhou. Tensile Properties of Cast Alloy IN625 in Relation to d Phase Precipitation[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(4): 535-540.

Figures/Tables 8

Table 1 Nominal compositions of the experimental alloys (wt%) [23]

Alloy	Nb	Mo	Cr	C	Ni
3.15Nb	3.15	9	21.5	0.05	Bal.
3.8Nb	3.8	9	21.5	0.05	Bal.
4.5Nb	4.5	9	21.5	0.05	Bal.

Fig. 1 SEM micrographs of δ phases in the Nb series of alloys after aging at 750 °C for 1000, 5000 and 17,000 h

Fig. 2 TEM image of the δ phases and corresponding selected-area electron diffraction pattern (inset)

Fig. 3 δ Phase area fraction evolution as a function of aging time and Nb content after aging at 750 °C

Fig. 4 Relationship between ln[-ln(1-Aδ/As)] and lnt

Table 2 Parameters for precipitation kinetics of δ phase

Alloy	α	N
3.15Nb	4.47?×?10^-7	0.876
3.8Nb	3.51?×?10^-6	0.792
4.5Nb	2.57?×?10^-5	0.710

Fig. 5 Tensile properties at 700 °C of the Nb series of alloys aged at 750 °C for 0 h (as-solution-treated), 1000, 3000 and 5000 h

Fig. 6 a YS, b UTS, c EL variations plotted as a function of the δ phase area fraction, d the dislocation substructure around δ phase in the aged experimental alloys after tensile tests

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Tensile Properties of Cast Alloy IN625 in Relation to d Phase Precipitation

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