Analysis of ductile cast iron tensile tests to relate ductility variation to casting defects and material microstructure

Karl-Fredrik, Nilsson; Vokál, Vratko

doi:10.1016/j.msea.2008.09.082

Cited by 47 publications

(36 citation statements)

References 13 publications

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“…The vast majority of studies have been conducted on aluminum and magnesium alloys ( . Two exceptions are the investigations by Mattek on cast 410 stainless steel and the work by Nilsson and Vokal on cast iron ( Ref 25,26). No prior studies were found on 17-4PH or other precipitation hardened stainless steels.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Casting Porosity on the Tensile Behavior of Investment Cast 17-4PH Stainless Steel

Susan

Crenshaw

Gearhart

2015

J. of Materi Eng and Perform

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The effect of casting porosity on the mechanical behavior of investment cast 17-4PH stainless steel was studied as well as the effect of heat treatment on the alloyÕs sensitivity to casting defects. Interdendritic porosity, formed during solidification and shrinkage of the alloy, reduces the yield strength and ultimate tensile strength roughly in proportion to the reduction in load bearing cross-section. The effects of casting porosity on ductility (% strain, % reduction in area) are more severe, in agreement with research on other alloy systems. In this study, 10% porosity reduced the ductility of 17-4PH stainless steel by almost 80% for the high-strength H925 condition. Tensile testing at -10°C (263 K) further reduces the alloy ductility with and without pores present. In the lower strength H1100 condition, the ductility is higher than the H925 condition, as expected, and somewhat less sensitive to porosity. By measuring the area % porosity on the fracture surface of tensile specimens, the trend in failure strain versus area % porosity was obtained and analyzed using two methods: an empirical approach to determine an index of defect susceptibility with a logarithmic fit and an analytical approach based on the constitutive stress-strain behavior and critical strain concentration in the vicinity of the casting voids. The applicability of the second method depends on the amount of non-uniform strain (necking) and, as such, the softer H1100 material did not correlate well to the model. The behavior of 17-4PH was compared to previous work on cast Al alloys, Mg alloys, and other cast materials.

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Section: Introductionmentioning

confidence: 99%

The Effects of Casting Porosity on the Tensile Behavior of Investment Cast 17-4PH Stainless Steel

Susan

Crenshaw

Gearhart

2015

J. of Materi Eng and Perform

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“…With higher content of pearlite, and/or stronger deviations of the shape of the graphite particles from the spherical one, and/or higher contents of silicon the material becomes more brittle and thus the strain at failure decreases. Empirical relations for the effect were derived by Nilsson et al [90,91]. Especially under low stress triaxialities the graphite plays an important role, which was, however, only investigated in a few studies yet [27,79].…”

Section: Monotonic Loadingmentioning

confidence: 99%

Micromechanisms of fracture in nodular cast iron: From experimental findings towards modeling strategies – A review

Hütter

Zybell

Kuna

2015

Engineering Fracture Mechanics

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“…The J-integral needs to be computed for a set of given crack configurations, Jðp; a i ðT; /ÞÞ, and where cracks need to be described by some distribution function. Such an approach has been used to study how the ductility of ductile cast iron is affected by casting defects [44].…”

Section: Discussionmentioning

confidence: 99%

An elasto-plastic fracture mechanics based model for assessment of hydride embrittlement in zircaloy cladding tubes

Karl-Fredrik

Jakšić

Vokál

2010

Journal of Nuclear Materials

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Analysis of ductile cast iron tensile tests to relate ductility variation to casting defects and material microstructure

Cited by 47 publications

References 13 publications

The Effects of Casting Porosity on the Tensile Behavior of Investment Cast 17-4PH Stainless Steel

The Effects of Casting Porosity on the Tensile Behavior of Investment Cast 17-4PH Stainless Steel

Micromechanisms of fracture in nodular cast iron: From experimental findings towards modeling strategies – A review

An elasto-plastic fracture mechanics based model for assessment of hydride embrittlement in zircaloy cladding tubes

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