Soundness of spray formed disc shape tools of hot-work steels

Yunfeng Yang (Corresponding Author), Simo-Pekka Hannula

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

This paper presents metallurgical factors causing porosity in the spray formed die inserts and the corresponding solutions. High quality die inserts can be produced by spray forming if a good control of deposition parameters and the sprayed material is assured. Mechanism of the pore formation is discussed. Deoxidation of the melt at tapping for porosity reduction is found to be very difficult because it causes great variation in viscosity of the melt so that the process is difficult to control. Often the tundish nozzle is also blocked or frozen. Modification of the steel composition is found to be an effective method to improve the soundness of the deposition. Effects of different alloying elements on the soundness of the deposition are discussed. Especially influential on improving the soundness is the increased alloying of high temperature carbide-forming elements such as vanadium. A new series of hot-work steels is developed for spray forming high quality tools, which have not only improved soundness, but also longer lifetimes than the conventional hot-work steels.

Original languageEnglish
Pages (from-to)39-44
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume383
Issue number1
DOIs
Publication statusPublished - 2004
MoE publication typeA1 Journal article-refereed

Fingerprint

disks (shapes)
Steel
sprayers
steels
inserts
porosity
alloying
Porosity
Vanadium
Alloying elements
Alloying
carbides
vanadium
nozzles
Carbides
Nozzles
Viscosity
viscosity
life (durability)
causes

Keywords

  • rapid tooling
  • spray forming
  • near-net shape manufacturing
  • tool steel
  • soundness

Cite this

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title = "Soundness of spray formed disc shape tools of hot-work steels",
abstract = "This paper presents metallurgical factors causing porosity in the spray formed die inserts and the corresponding solutions. High quality die inserts can be produced by spray forming if a good control of deposition parameters and the sprayed material is assured. Mechanism of the pore formation is discussed. Deoxidation of the melt at tapping for porosity reduction is found to be very difficult because it causes great variation in viscosity of the melt so that the process is difficult to control. Often the tundish nozzle is also blocked or frozen. Modification of the steel composition is found to be an effective method to improve the soundness of the deposition. Effects of different alloying elements on the soundness of the deposition are discussed. Especially influential on improving the soundness is the increased alloying of high temperature carbide-forming elements such as vanadium. A new series of hot-work steels is developed for spray forming high quality tools, which have not only improved soundness, but also longer lifetimes than the conventional hot-work steels.",
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Soundness of spray formed disc shape tools of hot-work steels. / Yang, Yunfeng (Corresponding Author); Hannula, Simo-Pekka.

In: Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, Vol. 383, No. 1, 2004, p. 39-44.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Soundness of spray formed disc shape tools of hot-work steels

AU - Yang, Yunfeng

AU - Hannula, Simo-Pekka

PY - 2004

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AB - This paper presents metallurgical factors causing porosity in the spray formed die inserts and the corresponding solutions. High quality die inserts can be produced by spray forming if a good control of deposition parameters and the sprayed material is assured. Mechanism of the pore formation is discussed. Deoxidation of the melt at tapping for porosity reduction is found to be very difficult because it causes great variation in viscosity of the melt so that the process is difficult to control. Often the tundish nozzle is also blocked or frozen. Modification of the steel composition is found to be an effective method to improve the soundness of the deposition. Effects of different alloying elements on the soundness of the deposition are discussed. Especially influential on improving the soundness is the increased alloying of high temperature carbide-forming elements such as vanadium. A new series of hot-work steels is developed for spray forming high quality tools, which have not only improved soundness, but also longer lifetimes than the conventional hot-work steels.

KW - rapid tooling

KW - spray forming

KW - near-net shape manufacturing

KW - tool steel

KW - soundness

U2 - 10.1016/j.msea.2004.02.066

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JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

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SN - 0921-5093

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