CH572983A5 - Sub-zero treatment for altering microstructure of materials - esp for metals polyurethane and nylon involves controlled cooling to avoid cracking, maintaining at the low temp, then warming to r.t - Google Patents

Sub-zero treatment for altering microstructure of materials - esp for metals polyurethane and nylon involves controlled cooling to avoid cracking, maintaining at the low temp, then warming to r.t

Info

Publication number
CH572983A5
CH572983A5 CH560175A CH560175A CH572983A5 CH 572983 A5 CH572983 A5 CH 572983A5 CH 560175 A CH560175 A CH 560175A CH 560175 A CH560175 A CH 560175A CH 572983 A5 CH572983 A5 CH 572983A5
Authority
CH
Switzerland
Prior art keywords
esp
temp
matl
low temp
microstructure
Prior art date
Application number
CH560175A
Original Assignee
Lance James W
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 Lance James W filed Critical Lance James W
Priority to CH560175A priority Critical patent/CH572983A5/en
Publication of CH572983A5 publication Critical patent/CH572983A5/en

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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/04—Hardening by cooling below 0 degrees Celsius
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/08—Heat treatment

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

The microstructure of a non-textile matl. is altered by a cold-treatment, the matl. being cooled from normal temp. to a very low temp. using a speed which is not so drastic that fissures or cracks occur, held for a prescribed time at the low temp. and then restored to room temp. The matl. is pref. held 18-30 hrs. at the low temp., esp. at-196 degrees C, and it may be cooled in 2 or 3 stages to a temp. above or below the threshold temp. or the 2 threshold temps. at which cracks form. A pref. cooling velocity is 1.56-2.22 degrees C/minute to 5.94-8.33 degrees C/minute. The matl. is pref. metal, nylon, or polyurethane. Esp. for metals, for the conversion of iron alloys from an austenitic structure to a martensitic structure, e.g. to improve wear-resistance. A pref. method of cooling consists of the gradual immersion of the matl. in a cold liq., esp. liq nitrogen.
CH560175A 1975-05-01 1975-05-01 Sub-zero treatment for altering microstructure of materials - esp for metals polyurethane and nylon involves controlled cooling to avoid cracking, maintaining at the low temp, then warming to r.t CH572983A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CH560175A CH572983A5 (en) 1975-05-01 1975-05-01 Sub-zero treatment for altering microstructure of materials - esp for metals polyurethane and nylon involves controlled cooling to avoid cracking, maintaining at the low temp, then warming to r.t

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH560175A CH572983A5 (en) 1975-05-01 1975-05-01 Sub-zero treatment for altering microstructure of materials - esp for metals polyurethane and nylon involves controlled cooling to avoid cracking, maintaining at the low temp, then warming to r.t

Publications (1)

Publication Number Publication Date
CH572983A5 true CH572983A5 (en) 1976-02-27

Family

ID=4296337

Family Applications (1)

Application Number Title Priority Date Filing Date
CH560175A CH572983A5 (en) 1975-05-01 1975-05-01 Sub-zero treatment for altering microstructure of materials - esp for metals polyurethane and nylon involves controlled cooling to avoid cracking, maintaining at the low temp, then warming to r.t

Country Status (1)

Country Link
CH (1) CH572983A5 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1167551A1 (en) * 2000-06-21 2002-01-02 Iwatani International Corp. Sub-zero heat treatment method of steel
EP3434795A1 (en) * 2017-07-25 2019-01-30 Messer Group GmbH Method for cold treatment of metallic workpieces

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1167551A1 (en) * 2000-06-21 2002-01-02 Iwatani International Corp. Sub-zero heat treatment method of steel
US6506270B2 (en) 2000-06-21 2003-01-14 Iwatani International Corporation Heat treatment method of steel
EP3434795A1 (en) * 2017-07-25 2019-01-30 Messer Group GmbH Method for cold treatment of metallic workpieces

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Legal Events

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