EP 3473735 A4 20200219 - TREATMENT PROCESS FOR OBTAINING GRADED PERFORMANCE AND MEMBER THEREOF
Title (en)
TREATMENT PROCESS FOR OBTAINING GRADED PERFORMANCE AND MEMBER THEREOF
Title (de)
BEHANDLUNGSVERFAHREN ZUM ERHALT EINER ABGESTUFTEN LEISTUNG UND ELEMENT DAFÜR
Title (fr)
PROCÉDÉ DE TRAITEMENT PERMETTANT D'OBTENIR DES PERFORMANCES PROGRESSIVES ET ÉLÉMENT ASSOCIÉ
Publication
Application
Priority
- CN 201610440901 A 20160620
- CN 2016090629 W 20160720
Abstract (en)
[origin: EP3473735A1] The present invention relates to a treatment process for obtaining gradient properties, comprising the steps of: A. preparing a blank, dividing the blank into a region to be formed as a hard zone, and a region to be formed as a soft zone; B. heating the region to be formed as a hard zone to 720 °C or more, such that its microstructure is transformed into austenite; C. stamping the entire blank and cooling it by any cooling method after the stamping; D. subjecting the hard zone of a component obtained after the stamping to carbon partitioning treatment to diffuse carbon from martensite to austenite; keeping a temperature of the region to be formed as the soft zone lower than 720 °C in step B, or adding a step E after the step D, wherein the region forming the soft zone is heated to 600 to 720 °C and soaked for 0.5 to 60 minutes. The invention also relates to a formed component made by the above-described treatment process. The treatment process of the invention has a simple die and good process reliability, and can realize a tensile strength of 900-1500 MPa of the soft zone and an elongation of more than 15%, which is far superior to the prior art.
IPC 8 full level
C21D 8/00 (2006.01); B21D 22/02 (2006.01); B21D 37/16 (2006.01); B21D 53/88 (2006.01); C21D 1/19 (2006.01); C21D 1/673 (2006.01); C21D 8/02 (2006.01); C21D 9/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/18 (2006.01); C22C 38/38 (2006.01)
CPC (source: EP)
B21D 22/022 (2013.01); B21D 37/16 (2013.01); B21D 53/88 (2013.01); C21D 1/19 (2013.01); C21D 1/673 (2013.01); C21D 9/0068 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C21D 2211/00 (2013.01); C21D 2211/001 (2013.01); C21D 2211/008 (2013.01); C21D 2221/00 (2013.01); C22C 38/08 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/18 (2013.01); C22C 38/38 (2013.01)
Citation (search report)
- [Y] US 2002104591 A1 20020808 - GEHRINGHOFF LUDGER [DE], et al
- [Y] CN 104726677 A 20150624 - YANCHENG KEAO MECHAICAL CO LTD
- [Y] US 5972134 A 19991026 - BUSCHSIEWEKE OTTO [DE], et al
- [Y] CN 104729278 A 20150624 - YANCHENG KEAO MECHAICAL CO LTD
- [A] US 2012273096 A1 20121101 - MASEK BOHUSLAV [CZ], et al
- [A] CN 103409613 A 20131127 - UNIV SHANGHAI JIAOTONG
- [A] CN 104668326 A 20150603 - SHANDONG DAWANG JINTAI GROUP CO LTD
- [A] EP 2824209 A1 20150114 - KOBE STEEL LTD [JP]
- [A] WO 2016046637 A1 20160331 - MAGNA INT INC [CA]
- See also references of WO 2017219427A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 3473735 A1 20190424; EP 3473735 A4 20200219; EP 3473735 B1 20240110; EP 3473735 C0 20240110
DOCDB simple family (application)
EP 16905967 A 20160720