Improved creep strength of nickel-base superalloys by optimized γ/γ′ partitioning behavior of solid solution strengthening elements

Pröbstle, M.; Neumeier, Steffen; Feldner, Patrick; Rettig, Ralf; Helmer, Harald; Singer, Robert F.; Göken, Mathias

doi:10.1016/j.msea.2016.08.121

Cited by 61 publications

(27 citation statements)

References 64 publications

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“…[22] Moreover, the SX version MAR-M200+Hf is a first-generation Ni-based SX superalloy without rhenium (Re, see Table II) which is an element known to improve creep properties by retarding c¢ rafting and strengthening the matrix. [58,59] Creep damage in the fracture surfaces of VHCF specimens is characterized by the occurrence of mode I cracks that have initiated and propagated from pores for all materials tested. For DS200+Hf alloy, mode I cracks have also initiated from internal clusters of carbides [see Figure 8(b)] and at the sub-surface of the specimens.…”

Section: Impact Of Creep Damage At R = 08mentioning

confidence: 99%

Very High Cycle Fatigue of Ni-Based Single-Crystal Superalloys at High Temperature

Cervellon

Cormier

Mauget

et al. 2018

Metall Mater Trans A

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Section: Impact Of Creep Damage At R = 08mentioning

confidence: 99%

Very High Cycle Fatigue of Ni-Based Single-Crystal Superalloys at High Temperature

Cervellon

Cormier

Mauget

et al. 2018

Metall Mater Trans A

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“…Therefore, when these components are designed, the mechanical properties at elevated temperatures, especially the creep properties, should be carefully considered. It is well know that the creep behaviors of nickel‐based superalloys are quite complex . Normally, the creep behaviors involve the time dependent plastic deformation of alloys at constant or varying stresses, leading to the perpetual deformation of components .…”

Section: Introductionmentioning

confidence: 99%

Effects of Initial δ Phase on Creep Behaviors and Fracture Characteristics of a Nickel‐Based Superalloy

et al. 2017

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Uniaxial creep tensile experiments are performed to study the influences of initial δ phase (Ni 3 Nb) on the creep features and fracture behaviors of a nickel-based superalloy. Experimental results show that the creep features and fracture behaviors of the researched superalloy are closely relevant to the volume fraction of initial δ phase. The minimum creep rate increases with the increased volume fraction of initial δ phase. The appropriate volume fraction of initial δ phase can improve the creep resistance and plasticity. So, the rupture time and the elongation to fracture initially increase, when the volume fraction of initial δ phase is relatively low, and then decrease with the increase of volume fraction of initial δ phase. Additionally, with the increased initial δ phase, the failure mode changes from a typical intergranular fracture to the mixed fracture pattern of ductile intergranular and cleavage fracture.

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“…We noticed that certain ''control elements'' like titanium and tantalum can be used to change the c/c 0 partitioning behavior. [36][37][38][39] This means by addition of the control elements, the solid solution strengtheners can be pushed from the c 0 -precipitates, where they are less efficient, into the matrix, where they are wanted. With this strategy, alloys with the minimum amount of refractory metals are obtained.…”

Section: Alloy Development Revisited Using Multopt++mentioning

confidence: 99%

Development of Single-Crystal Ni-Base Superalloys Based on Multi-criteria Numerical Optimization and Efficient Use of Refractory Elements

Markl

Müller

Ritter

et al. 2018

Metall Mater Trans A

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The development of new Ni-base superalloys with a complex composition consisting of eight or more alloying elements is a challenging task. The experimental state-of-the-art development cycle is based on the adaption of already existing compositions. Although new alloy compositions with potentially improved material properties are expected to be similar to already known superalloys, this procedure impedes efficiently finding these compositions in the large multi-dimensional design-space of all alloying elements. Modern alloy development combines numerical optimization methods with experimental validation to guide the development towards promising compositions. In this work, an improved numerical multi-criteria optimization tool using CALPHAD calculations and semi-empirical models for alloy development is presented. The model improvements to its predecessor are described and the successful application for the development of rhenium-free single-crystal Ni-base superalloys ERBO/13 and ERBO/15 is revisited. The optimization tool is described and the designed alloys are discussed regarding phase stability. Finally, a possible phase stability model extending the optimization tool and improving the alloy composition predictions is presented.

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Improved creep strength of nickel-base superalloys by optimized γ/γ′ partitioning behavior of solid solution strengthening elements

Cited by 61 publications

References 64 publications

Very High Cycle Fatigue of Ni-Based Single-Crystal Superalloys at High Temperature

Very High Cycle Fatigue of Ni-Based Single-Crystal Superalloys at High Temperature

Effects of Initial δ Phase on Creep Behaviors and Fracture Characteristics of a Nickel‐Based Superalloy

Development of Single-Crystal Ni-Base Superalloys Based on Multi-criteria Numerical Optimization and Efficient Use of Refractory Elements

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