Influence of Mould Design on the Solidification and Soundness of Heavy Forging Ingots

Tashiro, Koichi; Watanabe, Shirô; Kitagawa, Ikujiro; Tamura, Itaru

doi:10.2355/tetsutohagane1955.67.1_103

Cited by 11 publications

(5 citation statements)

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“…It is well known that the as-cast microstructure, depending on the temperature gradient, is composed of three zones: chill, columnar, and equiaxed [12], with the high cooling rate occurring in the columnar zone. Such high cooling rates are at the origin of important thermal stresses as reported by many researchers [9,10].Therefore, the combination of weakened grain boundaries and a fast cooling rate could be at the origin of crack initiation. In addition to the above factors, the contribution from austenite to ferrite transformation in the development of tensile stresses and therefore crack initiation has to be considered [1].…”

Section: Discussionmentioning

confidence: 87%

Determination of the Root Causes for Cracking in a Large-Size Cast Ingot of AISI 4317 Steel Using Microstructural Analysis

Loucif

Bitterlin

Jahazi

et al. 2018

Metallogr. Microstruct. Anal.

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The objective of the present work is to study the root causes for the cracking and material detachment from the external surface of a 10 metric tons high-strength low-alloy steel ingot after solidification and annealing processes. Failure analysis investigations were conducted on different samples from the cracked areas as well as from non-cracked ones. A combination of optical and electron microscopies, x-ray diffraction, and microhardness techniques were used to study and analyze the nature, morphology, and composition of the different microstructural components in the cracked regions. Thermodynamic software, Thermo-Calc Ò was used to corroborate and interpret the experimental findings with the existing theories. The results indicated a strong intergranular character of the cracks accompanied by the presence of second-phase particles at prior austenite grain boundaries. Segregation of chromium and manganese was demonstrated through local chemical analysis of the grain boundaries. It was concluded that a rapid cooling rate combined with the weakening of grain boundaries was at the origin of crack initiation.

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Section: Discussionmentioning

confidence: 87%

Determination of the Root Causes for Cracking in a Large-Size Cast Ingot of AISI 4317 Steel Using Microstructural Analysis

Loucif

Bitterlin

Jahazi

et al. 2018

Metallogr. Microstruct. Anal.

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show abstract

“…Therefore, there has been several attempts to predict the segregation by the solidification profile in the large-scale ingot. 5,6) It is also known that the macrosegregation formation is affected by alloying elements and molten metal properties. 7) The macrosegregation tends to be more pronounced in 8Cr steel due to its wide solid-liquid coexistence temperature range than basic carbon steels.…”

Section: Macrosegregation Behavior Of 8cr Tool Steel With Induced Bri...mentioning

confidence: 99%

Macrosegregation Behavior of 8Cr Tool Steel with Induced Bridging of Solidification in Laboratory-scale Ingot

Sumi¹,

Narita²,

Yamashita

2023

ISIJ Int.

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“…Generally, such macrosegregation and flaw formation are highly affected by the dimension of the ingot case and design of feeder head. Therefore, there has been several attempts to predict the defect formation from the solidification profile in the large scale ingot [2,3]. These are very useful in practical way, however it needs huge efforts to handle large scale samples, it is beneficial to use small scale mock ingot for more basic research purpose.…”

Section: Introductionmentioning

confidence: 99%

The macrosegregation behaviour of Fe-C-Cr-Mo type steel in laboratory scale model ingot.

Sumi

Narita

Yamashita

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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In ingot casting, it is important to predict and control segregation and casting defects that occur during the solidification process, because they have a significant effect on the quality of the steel ingot. In some special steels, in typical Fe-C-Cr-Mo type high carbon tool steels, macro-segregation tends to be more pronounced due to their wide solid-liquid coexistence temperature range and molten steel properties such as relatively higher liquid viscosity than basic carbon steels. In order to investigate segregation and defect formation phenomena during solidification, many experiments have been conducted using specially designed laboratory scale model ingots that can induce partial difference of solidification to cause macrosegregation phenomena. However, these kind of experimental approaches for special steels are less conducted and influence of alloy types on the macrosegregation behaviour is still not well understood. In this study, a model ingot which have a steel chill ring in the middle region of a mullite mold was prepared, then Fe-0.45C(mass%) carbon steel, Fe-1C-1.8Cr(mass%) bearing steel and Fe-1C-8Cr-2Mo(mass%) high carbon tool steel were cast into 30kg ingots and the macrosegregation behaviour was investigated.

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Influence of Mould Design on the Solidification and Soundness of Heavy Forging Ingots

Cited by 11 publications

References 0 publications

Determination of the Root Causes for Cracking in a Large-Size Cast Ingot of AISI 4317 Steel Using Microstructural Analysis

Determination of the Root Causes for Cracking in a Large-Size Cast Ingot of AISI 4317 Steel Using Microstructural Analysis

Macrosegregation Behavior of 8Cr Tool Steel with Induced Bridging of Solidification in Laboratory-scale Ingot

The macrosegregation behaviour of Fe-C-Cr-Mo type steel in laboratory scale model ingot.

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