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Title:
MODIFIED AUSTENITIC STAINLESS STEEL HAVING GOOD HIGH-TEMPERATURE CREEP RESISTANCE PERFORMANCE AND PREPARATION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2020/147490
Kind Code:
A1
Abstract:
A modified austenitic stainless steel having a good high-temperature creep resistance performance and a preparation method therefor. Said modified steel comprises a steel substrate and a percolation layer, the percolation layer comprising, from inside to outside, a 40-80μm of Fe-phase diffusion layer containing Al, a 50-100μm of Fe-Al compound layer, and a 10-20μm of Al 2O 3 thin film. The preparation method comprises: (1) electrolytic polishing; (2) aluminum percolation: performing treatment at 400°C - 600°C and 900°C - 1050°C respectively, furnace cooling; (3) sandblasting: performing at 0.6MPa - 0.9MPa nitrogen; and (4) annealing: annealing at 1000°C - 1100°C, furnace cooling; and (5) laser shock peening: single pulse energy 4-7J, spot diameter 2.6 - 3mm, 1 - 3 times. The modified steel has a good creep resistance performance and corrosion resistance performance under the conditions of molten aluminium-silicon alloy, has a percolation layer without brittle phase, a strong binding force with the matrix, a good anti-strip performance, and a good toughness and strength.

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Inventors:
LI WEI (CN)
CHEN JIAN (CN)
XU DONGLIANG (CN)
LI CHUANCHANG (CN)
QIU WEI (CN)
REN YANJIE (CN)
HE JIANJUN (CN)
CHEN JIANLIN (CN)
PENG ZHUOYIN (CN)
Application Number:
PCT/CN2019/126131
Publication Date:
July 23, 2020
Filing Date:
December 18, 2019
Export Citation:
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Assignee:
UNIV CHANGSHA SCIENCE & TECH (CN)
International Classes:
C23C10/50
Foreign References:
CN108118285A2018-06-05
CN108118285A2018-06-05
CN101698930A2010-04-28
CN109735798A2019-05-10
CN103014725A2013-04-03
CN102220554A2011-10-19
CN103422098A2013-12-04
JPH0718410A1995-01-20
CN108097927A2018-06-01
Attorney, Agent or Firm:
CHANGSHA ZHIDE INTELLECTUAL PROPERTY AGENCY (GENERAL PARTNERSHIP) (CN)
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