A New Criterion for Prediction of Hot Tearing Susceptibility of Cast Alloys

Nasresfahani, Mohamad Reza; Niroumand, Behzad

doi:10.1007/s11661-014-2341-y

Cited by 18 publications

(5 citation statements)

References 14 publications

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“…This suggests that the growth term would be overestimated if (f S ) 1/2 in Eq. (10) were substituted by f S . Fig.…”

Section: Index For Crack Susceptibilitymentioning

confidence: 99%

“…The model, in the form of an empirical formula, assumes cracking can occur if volumetric shrinkage exceeds volumetric feeding. To include tensile deformation, Nasresfahani et al [10] revised Feurer's model into another empirical formula that includes a uniaxial contraction stress measured during casting. The prominent RDG model proposed by Rappaz, Drezet and Gremaud [11] considers both uniaxial tensile deformation and shrinkage feeding.…”

Section: Introductionmentioning

confidence: 99%

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A criterion for cracking during solidification

2015

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“…This suggests that the growth term would be overestimated if (f S ) 1/2 in Eq. (10) were substituted by f S . Fig.…”

Section: Index For Crack Susceptibilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A criterion for cracking during solidification

2015

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“…Istrumen Costrained T-Shaped Casting (ICTC) aparatus, This method was developed to analyse hot tearing, by eliminating the effect of constraints through the mould causing tensile and strain in the specimen [20,70,71]. The mould geometry was also designed to ensure that the cast metal specimen was free from contraction during solidification.…”

Section: Mould Type For Hot Tearing Observationmentioning

confidence: 99%

Archives of Foundry Engineering

2022

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Hot tearing is a casting defect responsible for external and internal cracks on casting products. This irregular undesired formation is often observed during solidification and freezing. The solidification of molten metal also causes thermal contraction and shrinkage, indicating the occurrence of hot tearing when the alloy is restrained by the mould design. The parameters affecting this process include the pouring and mould temperatures, the chemical composition of the alloy, and the mould shape. Also, the factors affecting hot tearing susceptibility include pouring and mould temperatures, the grain refiner, as well as pouring speed. There are many methods of measuring the level of susceptibility to hot tearing, one of which is the thermal contraction evaluation during metal solidification, observed in cast products through several mould types. This paper discusses the hot tearing overview, the effect of pouring temperature, mould temperature, grain refiner, pouring speed on hot tearing, the type of mould, and criterion for hot tear observation.

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“…Several models are available in the literature for predicting the solidification cracking susceptibility of an alloy as a function of composition [21][22][23][24][25][26][27]. In particular, the Kou model [19,28] provides a comprehensive approach for assessing the solidification cracking susceptibility for fusion welds.…”

Section: Introductionmentioning

confidence: 99%

Determination of Location-Specific Solidification Cracking Susceptibility for a Mixed Dissimilar Alloy Processed by Wire-Arc Additive Manufacturing

Sridar

Sargent

Wang

et al. 2022

Metals

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Solidification cracking is a major obstacle when joining dissimilar alloys using additive manufacturing. In this work, location-specific solidification cracking susceptibility has been investigated using an integrated computational materials engineering (ICME) approach for a graded alloy formed by mixing P91 steel and Inconel 740H superalloy. An alloy mixture of 26 wt.% P91 and 74 wt.% Inconel 740H, with high configurational and total entropy, was fabricated using wire arc additive manufacturing. Microstructure characterization revealed intergranular solidification cracks in the FCC matrix, which increased in length along with the enrichment of Nb (~27 to 56 wt.%) and Cu (~87 wt.%) in the middle and top regions. DICTRA simulations to model location-specific solidification cracking susceptibility showed that the top region with the highest cooling rate (270 K/s) has the highest solidification cracking susceptibility in comparison with the middle and bottom regions. This is in good agreement with the experimentally observed varying crack length. From Scheil simulations, it was deduced that enrichment of Nb and Cu affected the solidification range as high as ~77%, in comparison with the matrix composition. The overall solidification cracking susceptibility and freezing range was highest for the 26 wt.% P91 alloy amongst the mixed compositions between P91 steel and 740H superalloy, proving that solidification characteristics play a major role in alloy design for additive manufacturing.

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A New Criterion for Prediction of Hot Tearing Susceptibility of Cast Alloys

Cited by 18 publications

References 14 publications

A criterion for cracking during solidification

A criterion for cracking during solidification

Archives of Foundry Engineering

Determination of Location-Specific Solidification Cracking Susceptibility for a Mixed Dissimilar Alloy Processed by Wire-Arc Additive Manufacturing

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