TREATMENT PROCESS FOR OBTAINING GRADED PERFORMANCE AND MEMBER THEREOF

WIPO Patent Application WO/2017/219427

A1

Provided are a treatment process for obtaining graded performance and a formed member made therefrom. The process comprises the following steps: A. a blank material is prepared, and the blank material is divided into an area to be formed as a hard area and an area to be formed as a soft area; B. the area to be formed as a hard area is heated to 720ºC or higher to convert the microstructure thereof into austenite; C. the whole of the blank material is press-formed and cooled in an arbitrary cooling mode after press-forming; D. the hard area of the member obtained after press-forming is subjected to a carbon partitioning treatment to diffuse the carbon from martensite into the austenite; in step B, the temperature of the area to be formed as a soft area is kept lower than 720ºC at the same time or after step D is added step E, wherein the area to be formed as a soft area is heated to 600ºC to 720ºC for 0.5 to 60 minutes. The treatment process is simple in mould, and is good in process reliability, and the tensile strength of the soft area of 900 to 1500 MPa can be achieved, and the elongation is greater than 15%, superior to the prior art level.

YI HONGLIANG (CN)
DU PENGJU (CN)

PCT/CN2016/090629

December 28, 2017

July 20, 2016

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EASYFORMING STEEL TECH CO LTD (CN)

C21D8/00; C21D8/02

WO2006038868A1

2006-04-13

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CN103409613A	2013-11-27
US20130048160A1	2013-02-28
CN101861265A	2010-10-13
CN103878237A	2014-06-25

See also references of EP 3473735A4

CHINA PATENT AGENT (H.K.) LTD. (CN)

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