Effect of Alloying Elements and Impurity (N) on Bulk and Grain Boundary Cohesion in Cr-Base Alloys

Butrim, Victor Nikolaevich; Razumovskii, Igor M.; Beresnev, A.G.; Kartsev, A.; Razumovskiy, Vsevolod I.; Trushnikova, A.S.

doi:10.4028/www.scientific.net/AMR.1119.569

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HomeAdvanced Materials ResearchKey Engineering Materials VEffect of Alloying Elements and Impurity (N) on...

Effect of Alloying Elements and Impurity (N) on Bulk and Grain Boundary Cohesion in Cr-Base Alloys

Abstract:

Effect of comprehensive alloying system (W, Ta, Nb, Mo, V, Hf, Ti, Zr, Ni) and impurity N on cohesive properties of the bulk and the special high-angle grain boundary (GB) Σ5 (210)[100] in Cr-base alloys, as well as segregation behavior of impurities at the GB and the (210) free surface are studied by first principles calculations. The analysis of the data obtained allows us to single out W, Ta as the best and nitrogen as the worst interatomic bond strengthening elements for both the bulk and GB in Cr-base alloys. To verify these theoretical results by means of experiment, we investigated an influence of W (up to 10 wt. %), and (Ta, Nb, Hf and Zr) on mechanical properties of Cr-base alloy. We observed an increasing of the strength properties due to W addition and increasing of the plasticity as a result of (Ta, Nb, Hf, Zr) adding.

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Periodical:

Advanced Materials Research (Volume 1119)

Main Theme:

Key Engineering Materials V

Edited by:

Prof. Haider F. Abdul Amir, Prof. Alexander M. Korsunsky and Maria Mucha

Pages:

569-574

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1119.569

Citation:

V. N. Butrim et al., "Effect of Alloying Elements and Impurity (N) on Bulk and Grain Boundary Cohesion in Cr-Base Alloys", Advanced Materials Research, Vol. 1119, pp. 569-574, 2015

Online since:

July 2015

Authors:

Victor Nikolaevich Butrim *, Igor M. Razumovskii, A.G. Beresnev, A. Kartsev, Vsevolod I. Razumovskiy, A.S. Trushnikova

Keywords:

Ab Initio Calculation, Chromium Alloys, Cohesive Properties, Grain Boundary

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Paper TitlePages

Effects of Re Alloying on Mechanical Properties of In-Situ Composites with Base Composition of Nb-18Si-2HfC

Authors: Sheng Wu Wang, Tatsuo Tabaru, Hisatoshi Hirai, Hideto Ueno

Abstract: Nb-base in-situ composites with the base composition of Nb-18Si-2HfC were prepared by conventional arc-melting. Their microstructures and mechanical properties, such as high-temperature strength and room temperature fracture toughness, were investigated to elucidate the effects of Re alloying. The in-situ composites predominantly have eutectic microstructures consisting of an Nb solid solution (NbSS) and Nb5Si3. The compressive strength increased with the increasing Re contents at 1470K and not at 1670 K. The strengthening effect observed at 1470 K is higher than that by W and Mo. Re alloying of about 2 % is valuable for improving both the high temperature strength and room temperature fracture toughness of Nb-18Si-2HfC base materials.

941

High Temperature Mechanical Properties of Ni-Al-Cr Based Alloys with Refractory Alloying Elements

Authors: Won Yong Kim, Han Sol Kim, In Dong Yeo, Mok Soon Kim

Abstract: We report on advanced Ni3Al based high temperature structural alloys with refractory alloying elements such as Zr and Mo to be apllied in the fields of die-casting and high temperature press forming as die materials. The duplex microstructure consisting of L12 structured Ni3Al phase and Ni5Zr intermetallic dispersoids was observed to display the microstructural feature for the present alloys investigated. Depending on alloying elements, the volume fraction of 2nd phase was measured to be different, indicating a difference in solid solubility of alloying elements in the matrix γ’ phase. Lattice parameter of matrix phase increased with increasing content of alloying elements. In the higher temperature region more than 973K, the present alloys appeared to show their higher strength compared to those obtained in conventional superalloys. On the basis of experimental results obtained, it is suggested that refractory alloying elements have an effective role to improve the high temperature strength in terms of enhanced thermal stability and solid solution hardening.

358

Ni₃Al-Fe-Cr Alloy Processed by Combined Mechanical Alloying - Reactive Synthesis

Authors: Radu L. Orban, Mariana Lucaci

Abstract: Property modification of Ni3Al with alloying addition of Fe and Cr was investigated through MA and subsequent SHS processes. Fe addition brought about high temperature strengthening effect and formed a Ni-Fe compound in the liquid grainboudary phase of Ni3Al structure and Cr addition showed a retarded homogenization. Homogenized Ni3Al composition with Fe and Cr addition by MA and SHS showed better mechanical resistace and deformability in the compression tests at temperatures up to 800°C than the same composition processed by classical PM routes.

1581

Segregation of C, P and Mn in Rapid Solidified Carbon Steels

Authors: Na Li, Jun Wei Zhang, Lu Lu Zhai

Abstract: The quality and properties of steels may be affected due to the segregation of the alloying elements, even though the properties of steels can be improved by adding appropriate amount of alloying elements. Rapid solidification was regarded to be an effective method to reduce or eliminate the segregation of alloying elements. While the segregation of C, P and Mn was also observed in rapid solidified (in silicone oil) droplet carbon steels in this paper. The microstructures of rapid solidified droplets were rather fine. When the P content was less than about 0.09% (in mass) in low carbon steels, P did not show obvious segregation in rapid solidified droplet samples; when the P content raised up to about 0.5% in the samples, both P and Mn showed center segregation even though the content of Mn kept unchanged. So the alloying elements can segregate and even effect the distribution of other elements in rapid solidified steel samples. When the C content increased, the segregation of C was observed in high-C samples, while the segregation tendency is opposite to that of P in high-P samples. For all the droplet samples, the micro-hardness of high-P samples was also much higher than those samples with less P content.

3857

The Influence of Ni on the Microstructure of Co-Base ODS Alloys

Authors: Lin Zhang, Xin Bo He, Ming Li Qin, Ye Liu, Xuan Hui Qu

Abstract: Co-based ODS alloys strengthened by γ΄ precipitates and nanosized oxides are promising high-temperature structural materials. Single solid solution of Al and W in the matrix can not be achieved after mechanical alloying, resulting in the formation of low volume fraction of γ΄ phase and several kinds of secondary phases. The addition of Ni promotes the precipitation of γ΄ phase and reduces the amount of secondary phases by the enlargement of the solid solution limit of Al and W within the matrix. In comparison with the lower fracture strength and cleavage fracture mode of the alloy without the addition of Ni, Ni-containing Co-base ODS alloys exhibit much higher fracture strength and obvious ductile facture mode.

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