JPS57164917A - Soft nitriding and austempering method - Google Patents

Soft nitriding and austempering method

Info

Publication number
JPS57164917A
JPS57164917A JP4728581A JP4728581A JPS57164917A JP S57164917 A JPS57164917 A JP S57164917A JP 4728581 A JP4728581 A JP 4728581A JP 4728581 A JP4728581 A JP 4728581A JP S57164917 A JPS57164917 A JP S57164917A
Authority
JP
Japan
Prior art keywords
soft nitriding
parts
treatment
austempering
temp
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP4728581A
Other languages
Japanese (ja)
Inventor
Kyoichi Kaneko
Masayoshi Yokoi
Tadaoki Arakawa
Shinji Shibata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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 Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP4728581A priority Critical patent/JPS57164917A/en
Publication of JPS57164917A publication Critical patent/JPS57164917A/en
Pending legal-status Critical Current

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
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

PURPOSE:To obtain mechanical parts such as gears having deep surface hardened layers, hard core parts and small strains by heating steel to perfect austenitization temp., subjecting the same to a soft nitriding austempering treatment in a salt bath of high temp., then cooling the same. CONSTITUTION:Steel parts such as gears are heated to perfect austenitization temp. higher by about 30-50 deg.C than the A3 transformation point. These are immersed into a salt bath for soft nitriding treatment of about 500-650 deg.C whereby they are subjected to austempering and soft nitriding simultaneously, thence they are cooled. By this treatment, the nitrided and hardened layers of about 0.15-0.25 depths are formed, and the mechanical parts of the stable isothermal transformation structure in the core parts and about >=250Hv hardness are obtained.
JP4728581A 1981-04-01 1981-04-01 Soft nitriding and austempering method Pending JPS57164917A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4728581A JPS57164917A (en) 1981-04-01 1981-04-01 Soft nitriding and austempering method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4728581A JPS57164917A (en) 1981-04-01 1981-04-01 Soft nitriding and austempering method

Publications (1)

Publication Number Publication Date
JPS57164917A true JPS57164917A (en) 1982-10-09

Family

ID=12771013

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4728581A Pending JPS57164917A (en) 1981-04-01 1981-04-01 Soft nitriding and austempering method

Country Status (1)

Country Link
JP (1) JPS57164917A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4470854A (en) * 1981-10-01 1984-09-11 Kabushiki Kaisha Komatsu Seisakusho Surface hardening thermal treatment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4470854A (en) * 1981-10-01 1984-09-11 Kabushiki Kaisha Komatsu Seisakusho Surface hardening thermal treatment

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