Carbide phases in nickel base superalloy: nucleation properties of MC type carbide

Youdelis, W. V.; Kwon, Oh-Jong

doi:10.1179/030634583790420673

Cited by 29 publications

(12 citation statements)

References 3 publications

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“…The solidification rate has a large effect on carbide size and morphology, with higher rates producing finer carbides [7]. High solidification rates and small thermal gradients also result in more faceted nodular carbides, which is a lower energy configuration [16][17][18]. Carbide shapes are related to their formation temperature because this determines their formation position in the mushy zone.…”

Section: Introductionmentioning

confidence: 99%

Effect of minor alloying additions on the solidification of single-crystal Ni-base superalloys

Cutler

Wasson

Fuchs

2009

Journal of Crystal Growth

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Section: Introductionmentioning

confidence: 99%

Effect of minor alloying additions on the solidification of single-crystal Ni-base superalloys

Cutler

Wasson

Fuchs

2009

Journal of Crystal Growth

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“…Figure 2 shows the size distribution and number density of M 23 C 6 and MX with tantalum content. On the one hand, tantalum addition can cause the precipitation of carbides during tempering at 750°C instead of larger M 23 C 6 precipitates, since MX has higher nucleation entropy and nucleation rate as compared with M 23 C 6 [19]. The precipitation of carbonitrides prior to M 23 C 6 during tempering leads to a consumption of carbon concentration in the carbon-supersaturated martensitic matrix and correspondingly decreases the volume fraction and mean size of M 23 C 6 [15].…”

Section: Microstructuresmentioning

confidence: 99%

Improvement of High-Temperature Mechanical Properties of Low-Carbon RAFM Steel by MX Precipitates

Chen

Liu

Xiao

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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To investigate the influence of tantalum content on high-temperature mechanical properties of low-carbon reduced activation ferritic/martensitic (RAFM) steels, RAFM steels containing different tantalum contents (0 and 0.073%) were fabricated, and the tensile tests at room temperature and high temperature were performed, as well as the creep tests were conducted at 550°C with the applied stress of 180 and 220 MPa. It was found that 0.073% tantalum addition results in the increase in amount of stable carbonitrides (MX), and the creep rupture time of the steel under 180 MPa is obviously increased. In addition, the increase in MX caused by tantalum addition also leads to the improvement of high-temperature tensile strength. The improvement of high-temperature mechanical properties of RAFM steels is primarily related to the evolution of precipitates.Acta Metallurgica Sinica (English Letters) (2018) 31:706-712 https://doi.org/10.1007/s40195-018-0703-y( 0123456789().,-volV) (0123456789().,-volV)

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“…The nucleation entropy theory was also used to account for the carbide refinement in the solidification structure of Co-base [25] and Ni-base [26] superalloys containing Ta and Nb. The primary carbides in Co-base alloy (HS21) were determined to be M 23 C 6 type having the approximate stoichiometric formula (Cr 0.77 Co 0.15 Mo 0.08 ) 23 C 6 [26]. Increasing Ta or Nb content in the alloy progressively transformed the carbides to MC type, and for Ta and Nb contents exceeding ~1%, the transformation to fine and numerous TaC or NbC carbides was essentially complete.…”

Section: Applications In Refinement Of Solidification Structurementioning

confidence: 99%

“…The refinement of primary carbide particles in HS-alloys containing Ta and Nb is in agreement with the higher calculated nucleation entropies and rates for MC vs. the M 23 C 6 type carbides. In the Ni-base superalloy (713C), the primary carbides were determined to be MC type having the approximate composition (Nb 0.77 Ti 0.23 )C [26]. The addition of Ta or Nb to the alloy resulted in the incorporation of Ta or Nb into the carbides mostly at the expense of Ti, but the carbide type was not changed.…”

Section: Applications In Refinement Of Solidification Structurementioning

confidence: 99%

Material design and development: From classical thermodynamics to CALPHAD and ICME approaches

Luo

2015

Calphad

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This paper presents an overview and examples of material design and development using 1) classical thermodynamics; 2) CALPHAD (CALculation of PHAse Diagrams) modeling; and 3) Integrated Computational Materials Engineering (ICME) approaches. Although the examples are given in lightweight aluminum and magnesium alloys for structural applications, the fundamental methodology and modeling principles are applicable to all materials and engineering applications. The examples in this paper have demonstrated the effectiveness and limitations of classical thermodynamics in solving specific problems (such as nucleation during solidification and solid-state precipitation in aluminum alloys). Computational thermodynamics and CALPHAD modeling, when combined with critical experimental validation, have been used to guide the selection and design of new magnesium alloys for elevated-temperature applications. The future of material design and development will be based on a holistic ICME approach. However, key challenges exist in many aspects of ICME framework, such as the lack of diffusion/mobility databases for many materials systems, limitation of current microstructural modeling capability and integration tools for simulation codes of different length scales.

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Carbide phases in nickel base superalloy: nucleation properties of MC type carbide

Cited by 29 publications

References 3 publications

Effect of minor alloying additions on the solidification of single-crystal Ni-base superalloys

Effect of minor alloying additions on the solidification of single-crystal Ni-base superalloys

Improvement of High-Temperature Mechanical Properties of Low-Carbon RAFM Steel by MX Precipitates

Material design and development: From classical thermodynamics to CALPHAD and ICME approaches

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