WO2023162614A1 - Comprimé estampé à chaud - Google Patents

Comprimé estampé à chaud Download PDF

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Publication number
WO2023162614A1
WO2023162614A1 PCT/JP2023/003401 JP2023003401W WO2023162614A1 WO 2023162614 A1 WO2023162614 A1 WO 2023162614A1 JP 2023003401 W JP2023003401 W JP 2023003401W WO 2023162614 A1 WO2023162614 A1 WO 2023162614A1
Authority
WO
WIPO (PCT)
Prior art keywords
less
hot
content
grain size
stamped
Prior art date
Application number
PCT/JP2023/003401
Other languages
English (en)
Japanese (ja)
Inventor
ひとみ 西畑
真吾 藤中
由梨 戸田
Original Assignee
日本製鉄株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本製鉄株式会社 filed Critical 日本製鉄株式会社
Publication of WO2023162614A1 publication Critical patent/WO2023162614A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

Definitions

  • C is an element that improves the strength of the hot stamped compact. If the C content is less than 0.40%, the desired strength cannot be obtained in the hot-stamped product. Therefore, the C content is made 0.40% or more.
  • the C content is preferably more than 0.40%, 0.42% or more, 0.44% or more, or 0.45% or more.
  • the C content is made 0.70% or less.
  • the C content is 0.68% or less, 0.67% or less, 0.65% or less or 0.60% or less.
  • Co is an element that improves the strength of hot-stamped products by solid-solution strengthening.
  • the Co content may be 0.001% or more, the Co content is preferably 0.01% or more or 0.05% or more in order to reliably obtain this effect.
  • the Co content is preferably 4.00% or less.
  • the Co content may be 3.00% or less, 2.00% or less, 1.00% or less, 0.80% or less, or 0.60% or less.
  • the metal structure of the hot-stamped article according to the embodiment of the present invention contains 90% or more of martensite in volume fraction.
  • the residual structure is not particularly limited, it may consist of at least one of bainite, ferrite, retained austenite and pearlite in an amount of 10% or less.
  • Martensite is a very hard structure, so by including 90% or more by volume of martensite in a hot stamped product, high tensile strength and yield strength, specifically a tensile strength of 2200 MPa or more and a yield strength of 1800 MPa or more can be achieved.
  • the effect obtained by reducing the variation in prior austenite grain size does not exactly match the effect obtained by reducing the variation in hardness.
  • the reduction of the variation in the prior austenite grain size is due to the increase in the strength of the hot stamped compact and the increase in the grain boundary area in combination with the prior austenite grain size. While it contributes to the improvement of hydrogen embrittlement resistance, the reduction in hardness variation suppresses the local increase in hardness in the hot stamped product and suppresses the microscopic stress concentration. and thereby improve the hydrogen embrittlement resistance of the hot stamped compact.
  • prior austenite grain boundaries can serve as austenite nucleation sites. It is known that their boundaries (interfaces) can also serve as austenite nucleation sites. For this reason, the martensite structure has many austenite nucleation sites compared to structures such as ferrite and pearlite, for example.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

L'invention concerne un comprimé estampé à chaud qui a une composition chimique prescrite, et a une structure métallique contenant au moins 90 % en volume de martensite, le diamètre de grain moyen des grains d'austénite antérieurs étant de 3,0 µm ou moins, l'écart-type dans la distribution de diamètre de grain des grains d'austénite antérieurs étant de 1,5 µm ou moins, et la différence entre les valeurs minimale et maximale de la distribution de dureté Vickers dans la direction d'épaisseur de plaque étant de 35 % ou moins de la valeur moyenne de la distribution de dureté Vickers.
PCT/JP2023/003401 2022-02-25 2023-02-02 Comprimé estampé à chaud WO2023162614A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-028526 2022-02-25
JP2022028526 2022-02-25

Publications (1)

Publication Number Publication Date
WO2023162614A1 true WO2023162614A1 (fr) 2023-08-31

Family

ID=87765644

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/003401 WO2023162614A1 (fr) 2022-02-25 2023-02-02 Comprimé estampé à chaud

Country Status (1)

Country Link
WO (1) WO2023162614A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020158285A1 (fr) * 2019-01-31 2020-08-06 Ｊｆｅスチール株式会社 Élément pressé à chaud, feuille d'acier laminée à froid pour élément pressé à chaud, et procédés respectifs pour fabriquer ces produits
WO2021162084A1 (fr) * 2020-02-13 2021-08-19 日本製鉄株式会社 Article moulé estampé à chaud

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020158285A1 (fr) * 2019-01-31 2020-08-06 Ｊｆｅスチール株式会社 Élément pressé à chaud, feuille d'acier laminée à froid pour élément pressé à chaud, et procédés respectifs pour fabriquer ces produits
WO2021162084A1 (fr) * 2020-02-13 2021-08-19 日本製鉄株式会社 Article moulé estampé à chaud

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