Title:
鉄鋼材の製造方法
Document Type and Number:
Japanese Patent JP5900922
Kind Code:
B2
Abstract:
A base material of a ferrous material is heated to an AC1 point, which is a temperature to cause austenite appearance, or higher, and austenite appears in the base material 1a and 1b (S101). An amount of a strain assuming that an Mf point, which is a temperature where the base material becomes martensite completely, is decreased to be less than room temperature is introduced into the base material (S102). The all ferrous material becoming martensite on the occasion of cooling the ferrous material to room temperature is prevented. The base material is cooled to room temperature at a cooling rate where a line extrapolated a cooling curve of the base material intersects with a region where martensite is produced on the CCT diagram (S103). Austenite remains in the manufactured ferrous material at room temperature.
Inventors:
Hidetoshi Fujii
Yoshiaki Morisada
Yoshiaki Morisada
Application Number:
JP2012057986A
Publication Date:
April 06, 2016
Filing Date:
March 14, 2012
Export Citation:
Assignee:
National University Corporation Osaka University
International Classes:
C21D8/00; B23K20/12
Domestic Patent References:
| JP2008073694A | ||||
| JP2012040584A |
Foreign References:
| WO2010059201A2 |
Attorney, Agent or Firm:
Yoshiki Hasegawa
Yoshiki Kuroki
Ohno Arata
Yoshiki Kuroki
Ohno Arata