Method of making coated stamped parts and parts made therefrom

A manufacturing method and component technology, applied in the field of hot stamping components, can solve problems such as weak adhesion of stamping components

Active Publication Date: 2011-12-28
安赛乐米塔尔研究发展有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Attempts have been made to increase the productivity of the process by shortening the duration of soaking at the austenitizing temperature, however, limitations of the process have been found because for steel substrate elements, especially iron, with alumin

Method used

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  • Method of making coated stamped parts and parts made therefrom
  • Method of making coated stamped parts and parts made therefrom
  • Method of making coated stamped parts and parts made therefrom

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Embodiment

[0082] Cold-rolled steel sheets of thickness 1 and 2 mm are supplied with a steel composition comprising the following by weight: 0.22% C, 1.2% Mn, 0.2% Si, 0.2% Cr, 0.040% Al, 0.003% B, 0.030 %Ti, 0.0002% S, 0.020% P, and the remainder is iron and impurities inherent in processing. The microstructure consists of ferrite-pearlite. At this stage, the lack of martensite makes it easy to further cut, drill or stamp the sheet.

[0083] These panels have been pre-coated by successive immersion of the panels in an Al-Si liquid bath. A precoat is thus obtained, the thickness of which is 27 micrometers, comprising by weight 9% Si, 3% Fe, the remainder being aluminum and impurities inherent in processing. This pre-coat consists of the following layers:

[0084] - FeAl in direct contact with the steel substrate 3 and Fe 2 Al 5 thin layer (less than 1 micron).

[0085] - On top of this layer, a hexagonal, 5 micron thick intermetallic τ 5 layer;

[0086] - On top of this layer, t...

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Abstract

A manufacturing process of a hot stamped coated part comprising the following successive steps, in this order: providing a hot rolled or cold rolled steel sheet comprising a steel substrate and an aluminium-silicon alloy precoating, the precoating containing more than 50% of free aluminium and having a thickness comprised between 15 and 50 micrometers, then cutting the steel sheet to obtain a precoated steel blank, then heating the blank under non protective atmosphere up to a temperature Ti comprised between Te−10° C. and Te, Te being the eutectic or solidus temperature of the precoating, then heating the blank from the temperature Ti up to a temperature Tm comprised between 840 and 950° C. under non protective atmosphere with a heating rate V comprised between 30° C./s and 90° C./s, V being the heating rate between the temperature Ti and the temperature Tm, in order to obtain a coated heated blank, then soaking the coated heated blank at said temperature Tm for a time tm comprised between 20 s and 90 s, then hot stamping the blank in order to obtain a hot stamped coated part, then cooling said stamped part at a cooling rate in order to form a microstructure in the steel substrate comprising at least one constituent chosen among martensite or bainite.

Description

technical field [0001] The invention relates to a method of manufacturing hot stamped parts prepared from steel sheets precoated with an aluminum-silicon alloy, and to hot stamped coated articles obtained by the method. Background technique [0002] Especially in the automotive industry the hot stamping method of pre-painted sheets has been widely used for the manufacture of components, since it allows the production of components with high mechanical resistance and good shock resistance. Metallic pre-coating avoids oxidation and decarburization of the steel substrate during furnace heating prior to hot stamping. An intermetallic alloy with a high melting temperature is formed in the coating by interdiffusion between the precoat and the steel substrate. The heating temperature is chosen to austenitize the steel so that further hardening of the steel substrate is also achieved by quenching in the forming tool. [0003] European patent specification EP0971044 discloses a met...

Claims

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Application Information

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IPC IPC(8): B32B15/01C21D1/70
CPCC22C38/18C21D1/42C21D1/673B32B15/012C22C21/02C22C38/02C22C38/04C21D1/68C21D1/70C21D7/13C21D2211/008C22C38/32C21D2211/002C21D1/40C21D1/08C21D1/09C23C10/28C22C21/00Y02P10/25B32B15/01B32B37/06
Inventor 伊莎贝拉·蒂里翁托马斯·维托里斯莱莎·格力高瑞娃帕斯卡尔·德黑莱特路德维希·沙勒卡尔·米歇尔·巴德乌韦·帕尔米歇尔·奥斯曼
Owner 安赛乐米塔尔研究发展有限公司
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