Title:
LOW DENSITY ZINC-COATED TRIP-ASSISTED STEEL AND FABRICATION METHOD
Document Type and Number:
WIPO Patent Application WO/2017/185319
Kind Code:
A1
Abstract:
Methods are provided for forming low density zinc-coated TRIP-assisted steel having a multiphase bainitic microstructure produced by austenitization, quenching, and zinc coating. A conventional step of isothermal bainitic holding is eliminated and the zinc coated steel alloy may have an elongation of ≥ about 30% to ≤ 45%. The zinc coated steel alloy may have a multiphase microstructure of ≥ about 40 to ≤ about 60% ferrite; ≥ about 15 to ≤ about 30% metastable retained austenite; and ≥ about 10 to ≤ about 45% bainite. The zinc coated steel alloy preferably comprises carbon at ≥ about 0.35 to ≤ about 0.45 wt. %; silicon at ≤ about 0.5 wt. %; manganese at ≥ about 0.2 to ≤ about 1 wt. %; aluminum at ≥ about 3 to ≤ about 5 wt. %; chromium at ≤ about 0.5 wt. %; and a balance of iron and impurities.
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Inventors:
XIONG XIAOCHUAN (CN)
YI HONGLIANG (CN)
WANG JIANFENG (CN)
YI HONGLIANG (CN)
WANG JIANFENG (CN)
Application Number:
PCT/CN2016/080625
Publication Date:
November 02, 2017
Filing Date:
April 29, 2016
Export Citation:
Assignee:
GM GLOBAL TECH OPERATIONS LLC (US)
UNIV NORTHEASTERN (CN)
UNIV NORTHEASTERN (CN)
International Classes:
C22C38/16; C21D8/02; C23C2/06
Domestic Patent References:
| WO2015115112A1 | 2015-08-06 |
Foreign References:
| CN101353761A | 2009-01-28 | |||
| CN103361547A | 2013-10-23 |
Attorney, Agent or Firm:
CHINA PATENT AGENT (H.K.) LTD. (CN)
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