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Zinc-coated hot formed high strength steel part with through-thickness gradient microstructure

A high-strength steel, hot forming technology, applied in the field of hot-formed press-hardened high-strength steel parts, can solve the problem of not having high strength or hardness level

Active Publication Date: 2017-11-10
GM GLOBAL TECH OPERATIONS LLC
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the alternative hot-formed press-hardened structure formed from such select TRIP steels typically has a microstructure with retained austenite, so it may not be comparable to a comparable PHS structure with a fully martensitic microstructure. Higher strength or hardness levels than

Method used

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  • Zinc-coated hot formed high strength steel part with through-thickness gradient microstructure
  • Zinc-coated hot formed high strength steel part with through-thickness gradient microstructure
  • Zinc-coated hot formed high strength steel part with through-thickness gradient microstructure

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Embodiment Construction

[0042]Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth (eg, examples of specific compositions, components, devices, and methods) in order to provide a thorough understanding of embodiments of the invention. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms, and that neither should be construed to limit the scope of the invention. In some example embodiments, well-known processes, known device structures, and known technologies are not described in detail.

[0043] The terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms unless the context clearly dictates otherwise...

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Abstract

Methods of strengthening surface regions of high-strength transformation induced plasticity (TRIP) steel are provided. The method may comprise shot peening at least one region of an exposed surface of a hot-formed press-hardened component comprising a high-strength steel. Prior to shot peening, the component has a microstructure comprising >=about 5% by volume retained austenite in a matrix of martensite. The shot peening is conducted at a temperature of <about 150DEG. and forms at least one hardened surface region comprising <=about 2% by volume austenite. The TRIP steel may be zinc-coated and having a surface coating comprising zinc and substantially free of liquid metal embrittlement (LME). Zinc-coated hot-formed press-hardened components, including automotive components, formed from such methods are also provided.

Description

technical field [0001] The present invention relates to a thermoformed press-hardened high strength steel part having a through-thickness gradient microstructure and a method of selectively surface hardening to form a thermoformed press-hardened high strength steel part. Background technique [0002] This section provides background information related to the present disclosure which is not necessarily prior art. [0003] Press-hardened steel (PHS), also known as "hot stamping steel" or "boron steel" (e.g., 22MnB5 alloy), is one of the strongest steels used in automotive body structural applications, with tensile strength properties typically around 1400 megapascal (MPa) or higher. This steel alloy has a lower manganese level and no aluminum, and it has various desirable properties including a higher strength to weight ratio. Components formed from PHS have become increasingly common in a variety of industries and applications including general manufacturing, construction ...

Claims

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Application Information

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IPC IPC(8): C21D7/06C22C38/04C22C38/14C22C38/38C22C38/28C22C38/02C22C38/06C22C38/60
CPCC21D7/06C22C38/02C22C38/04C22C38/06C22C38/14C22C38/28C22C38/38C22C38/60C21D2211/008C21D2211/001C21D7/02C21D7/04C21D7/00B24C1/10B32B15/013C21D6/002C21D6/005C21D6/008C21D8/005C21D9/0068C22C38/002C23C2/06C23C2/34
Inventor 王建锋
Owner GM GLOBAL TECH OPERATIONS LLC
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