JPS5445618A - Microcrystalization of steel structure - Google Patents

Microcrystalization of steel structure

Info

Publication number
JPS5445618A
JPS5445618A JP11207877A JP11207877A JPS5445618A JP S5445618 A JPS5445618 A JP S5445618A JP 11207877 A JP11207877 A JP 11207877A JP 11207877 A JP11207877 A JP 11207877A JP S5445618 A JPS5445618 A JP S5445618A
Authority
JP
Japan
Prior art keywords
cooling
ductility
toughness
mechanical properties
room temperature
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
JP11207877A
Other languages
Japanese (ja)
Inventor
Koji Hosomi
Yoshio Ashida
Katsuhiro Itayama
Nobuisa Shikita
Kumiko Sai
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel 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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP11207877A priority Critical patent/JPS5445618A/en
Publication of JPS5445618A publication Critical patent/JPS5445618A/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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working

Landscapes

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

Abstract

PURPOSE:In a process of heating steel material just above the point of Ac3 wherein a phase modification proceeds from alpha to beta, a predetermined stress is added to effect plastic deformation giving rise to a superfine structure, whereby mechanical properties such as toughness and ductility are significantly improve. CONSTITUTION:A steel material is heated at a constant rate from room temperature through the point Ac1 to Ac3 and cooled to room temperature by forced air cooling, mist spray, water cooling and oil cooling. During the whole heating process from Ac1 to Ac3, the steel is continuously loaded with at least 7.5kg/mm.<2> which value is higher than yield strength of austenite phase at a temperature of Ac3 or just above Ac3 to cause 5% plastic deformation. No load is applied during the cooling process. One or two applications of this treatment provides superfine crystal grains with average diameters of 0.5 to 5 microns, which greatly contributes improved mechanical properties such as toughness and ductility.
JP11207877A 1977-09-16 1977-09-16 Microcrystalization of steel structure Pending JPS5445618A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11207877A JPS5445618A (en) 1977-09-16 1977-09-16 Microcrystalization of steel structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11207877A JPS5445618A (en) 1977-09-16 1977-09-16 Microcrystalization of steel structure

Publications (1)

Publication Number Publication Date
JPS5445618A true JPS5445618A (en) 1979-04-11

Family

ID=14577516

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11207877A Pending JPS5445618A (en) 1977-09-16 1977-09-16 Microcrystalization of steel structure

Country Status (1)

Country Link
JP (1) JPS5445618A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03240921A (en) * 1990-02-15 1991-10-28 Sumitomo Metal Ind Ltd Production of seamless steel tube having superfine structure
JPH03267316A (en) * 1990-03-19 1991-11-28 Sumitomo Metal Ind Ltd Production of seamless steel tube having superfine structure
JPH04143219A (en) * 1990-10-03 1992-05-18 Sumitomo Metal Ind Ltd Production of bar steel having superfine structure
CN104694711A (en) * 2015-03-16 2015-06-10 上海交通大学 Control method of heat treatment distortion based on phase transformation plasticity

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03240921A (en) * 1990-02-15 1991-10-28 Sumitomo Metal Ind Ltd Production of seamless steel tube having superfine structure
JPH03267316A (en) * 1990-03-19 1991-11-28 Sumitomo Metal Ind Ltd Production of seamless steel tube having superfine structure
JPH04143219A (en) * 1990-10-03 1992-05-18 Sumitomo Metal Ind Ltd Production of bar steel having superfine structure
CN104694711A (en) * 2015-03-16 2015-06-10 上海交通大学 Control method of heat treatment distortion based on phase transformation plasticity

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