Critical Conditions for the Formation of A-segregation in 9Cr1Mo Steels

Ishida, Hideyuki; Sakamoto, Koichi; Nohara, Masami; Oki, Hirokazu; Ohsasa, Kenichi

doi:10.2355/tetsutohagane.95.26

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…Kazuhiko IWAI 1) * and Ginga KUSUNOKI 2) 1) Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo, 060-8628 Japan.…”

Section: Magnetic Field Effect On a Liquid Metal Flowing In A Packed Bedmentioning

confidence: 99%

Magnetic Field Effect on a Liquid Metal Flowing in a Packed Bed

Iwai,

Kusunoki

2023

ISIJ Int.

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“…Kazuhiko IWAI 1) * and Ginga KUSUNOKI 2) 1) Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo, 060-8628 Japan.…”

Section: Magnetic Field Effect On a Liquid Metal Flowing In A Packed Bedmentioning

confidence: 99%

Magnetic Field Effect on a Liquid Metal Flowing in a Packed Bed

Iwai,

Kusunoki

2023

ISIJ Int.

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“…Anther method, a horizontal directional solidification (H-DS) experiment, was also carried out to compare the test results. The H-DS experiment is a proven method and has been used in steel industries [6][7][8] .…”

Section: Figure 1 Schematic Of V-ds Apparatusmentioning

confidence: 99%

Assessment of Test Methods for Freckle Formation in Ni‐base Superalloy Ingot

Kawasaki¹,

Tanaka²,

Suzuki³

et al. 2010

Superalloy 718 and Derivatives

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Ni-base superalloys are well-known as freckle prone materials. Various researchers have reported on several types of test methods for investigating the freckle formation conditions in Nibase superalloy ingots. Although varieties of test methods have been studied, there seem to be few articles comparing the test methods. In order to reveal the characteristics of the test methods, some of the test methods were compared. This study shows which test method could be more suitable for the freckling condition in a large ingot. Also, the incompleteness of some of the freckle formation theories is discussed. Using a selected test method, the candidate Ni-base superalloys for an advanced ultra-supercritical (A-USC) steam turbine that would be operated in 700-760ºC steam conditions were tested. The experiment revealed the freckling tendency of A-USC candidate alloys.

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“…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. It is also known that the macrosegregation formation is affected by alloying element and molten metal properties [4]. In some special steels, for instance Fe-C-Cr-Mo type high carbon tool steels, macrosegregation 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.…”

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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Critical Conditions for the Formation of A-segregation in 9Cr1Mo Steels

Cited by 6 publications

References 15 publications

Magnetic Field Effect on a Liquid Metal Flowing in a Packed Bed

Magnetic Field Effect on a Liquid Metal Flowing in a Packed Bed

Assessment of Test Methods for Freckle Formation in Ni‐base Superalloy Ingot

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

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