JPS55158214A - Sub-zero treatment - Google Patents

Sub-zero treatment

Info

Publication number
JPS55158214A
JPS55158214A JP6711879A JP6711879A JPS55158214A JP S55158214 A JPS55158214 A JP S55158214A JP 6711879 A JP6711879 A JP 6711879A JP 6711879 A JP6711879 A JP 6711879A JP S55158214 A JPS55158214 A JP S55158214A
Authority
JP
Japan
Prior art keywords
held
sub
austenite
zero treatment
iron
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.)
Granted
Application number
JP6711879A
Other languages
Japanese (ja)
Other versions
JPS6112971B2 (en
Inventor
Ryoji Takahashi
Kenji Ito
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.)
Proterial Ltd
Original Assignee
Hitachi Metals Ltd
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 Hitachi Metals Ltd filed Critical Hitachi Metals Ltd
Priority to JP6711879A priority Critical patent/JPS55158214A/en
Publication of JPS55158214A publication Critical patent/JPS55158214A/en
Publication of JPS6112971B2 publication Critical patent/JPS6112971B2/ja
Granted 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
    • C21D5/00—Heat treatments of cast-iron

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)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

PURPOSE:To improve the fatigue strength of iron and steel material by applying sub-zero treatment of a short time to the austenite contained iron or steel material having undergone austempering to transform part or the whole of the austenite of the surface layer to martensite. CONSTITUTION:Spheroidal graphite cast iron is heated to 900 deg.C and is held at that temperature for 2hrs to perfectly austenitize the structure, after which it is hardened in the salt bath which is held at 235 deg.C. After it has been held in that state for 2hrs, it is taken out from the salt bath and is air cooled down to room temperature, thence it is dipped for 10 seconds in the mixed solution of liquid nitrogen and isopentane which is held at -100 deg.C, whereby the sub-zero treatment is done. This marthensitizes part or the whole of the austenite structure in the surface layer and improves fatigue strength.
JP6711879A 1979-05-30 1979-05-30 Sub-zero treatment Granted JPS55158214A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6711879A JPS55158214A (en) 1979-05-30 1979-05-30 Sub-zero treatment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6711879A JPS55158214A (en) 1979-05-30 1979-05-30 Sub-zero treatment

Publications (2)

Publication Number Publication Date
JPS55158214A true JPS55158214A (en) 1980-12-09
JPS6112971B2 JPS6112971B2 (en) 1986-04-11

Family

ID=13335651

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6711879A Granted JPS55158214A (en) 1979-05-30 1979-05-30 Sub-zero treatment

Country Status (1)

Country Link
JP (1) JPS55158214A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1911854A1 (en) * 2006-10-12 2008-04-16 Georg Fischer Automotive AG Removal of lids in surface spherical particles of grey cast workpiece by cryogenic treatment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107881295A (en) * 2017-11-18 2018-04-06 蚌埠中梁机械科技有限公司 A kind of surface treatment method of cast iron die

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1911854A1 (en) * 2006-10-12 2008-04-16 Georg Fischer Automotive AG Removal of lids in surface spherical particles of grey cast workpiece by cryogenic treatment

Also Published As

Publication number Publication date
JPS6112971B2 (en) 1986-04-11

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