Influence of Density and Sintering Temperature on Fatigue Crack Growth and Fracture Toughness of FL4405 High Strength PM Steel

Stephens, Robert J.; Prucher, T.

doi:10.1179/pom.1998.41.3.205

Cited by 6 publications

(1 citation statement)

References 6 publications

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“…7) However, up to now, most of the related studies have been focused only on its binder system, sintering parameters and alloying technique for the production of near full density materials. [8][9][10][11] For a wide application of the metal injection molding techniques, it is necessary to investigate microstructures and mechanical properties in relation to the above process variables. [12][13][14][15] Therefore, the aim of the present study is to investigate the microstructural changes and corresponding tensile and fatigue properties of metal injection molded 316L stainless steel with the variation of sintering conditions (temperature and time), and to discuss the roles of porosity and grain size on the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Effects of Sintering Conditions on the Mechanical Properties of Metal Injection Molded 316L Stainless Steel.

et al. 2003

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In this work, tensile and fatigue properties of the metal injection molded 316L stainless steel were studied with the variation of sintering conditions. It was found that increasing sintering temperature and time resulted in a decrease in the porosity along with an increase in the grain size. With decreasing porosity, tensile strength and elongation increased, while yield strength maintained constant, which was attributed to the balanced effects of decrease of porosity and grain coarsening. Tensile strength and elongation were found to be largely dependent on the porosity rather than on the grain size since the fracture occurred mainly by microvoid growth and coalescence. A quantitative analysis on the yield strength was tried by considering the classical Hall-Petch equation and mechanistic models for yield strength of porous materials. The fatigue crack growth resistance at low DK level was not largely decreased when the porosity was increased up to 8 %, but was significantly decreased when the porosity was increased to 17 %. It was discussed in relation to the intrinsic nature of pore morphology and the extrinsic nature of crack closure.

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Section: Introductionmentioning

confidence: 99%

Effects of Sintering Conditions on the Mechanical Properties of Metal Injection Molded 316L Stainless Steel.

et al. 2003

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Production of a Powder Metallurgical Hot Work Tool Steel with Harmonic Structure by Mechanical Milling and Spark Plasma Sintering

Deirmina

Pellizzari

Federici

2017

Metall Mater Trans A

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The fracture toughness of a material depends upon the material's composition and microstructure, as well as other material properties operating at the continuum level. The interrelationships between these variables are complex, and thus difficult to interpret, especially in multi-component, multi-phase ductile engineering alloys such as a/b-processed Ti-6Al-4V (nominal composition, wt pct). Neural networks have been used to elucidate how variables such as composition and microstructure influence the fracture toughness directly (i.e., via a crack initiation or propagation mechanism)-and independent of the influence of the same variables influence on the yield strength and plasticity of the material. The variables included in the models and analysis include (i) alloy composition, specifically, Al, V, O, and Fe; (ii) materials microstructure, including phase fractions and average sizes of key microstructural features; (iii) the yield strength and reduction in area obtained from uniaxial tensile tests; and (iv) an assessment of the degree to which plane strain conditions were satisfied by including a factor related to the plane strain thickness. Once trained, virtual experiments have been conducted which permit the determination of each variable's functional dependency on the resulting fracture toughness. Given that the database includes both K 1C and K Q values, as well as the in-plane component of the stress state of the crack tip, it is possible to quantitatively assess the effect of sample thickness on K Q and the degree to which the K Q and K 1C values may vary. These interpretations drawn by comparing multiple neural networks have a significant impact on the general understanding of how the microstructure influences the fracture toughness in ductile materials, as well as an ability to predict the fracture toughness of a/b-processed Ti-6Al-4V.

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Damage evolution in sinter-hardening powder-metallurgy steels during tensile and fatigue loading

2014

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Influence of Density and Sintering Temperature on Fatigue Crack Growth and Fracture Toughness of FL4405 High Strength PM Steel

Cited by 6 publications

References 6 publications

Effects of Sintering Conditions on the Mechanical Properties of Metal Injection Molded 316L Stainless Steel.

Effects of Sintering Conditions on the Mechanical Properties of Metal Injection Molded 316L Stainless Steel.

Production of a Powder Metallurgical Hot Work Tool Steel with Harmonic Structure by Mechanical Milling and Spark Plasma Sintering

Damage evolution in sinter-hardening powder-metallurgy steels during tensile and fatigue loading

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