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NANO-CRYSTAL AUSTENITIC STEEL BULK MATERIAL HAVING ULTRA-HARDNESS AND TOUGHNESS AND EXCELLENT CORROSION RESISTANCE, AND METHOD FOR PRODUCTION THEREOF
NANO-CRYSTAL AUSTENITIC STEEL BULK MATERIAL HAVING ULTRA-HARDNESS AND TOUGHNESS AND EXCELLENT CORROSION RESISTANCE, AND METHOD FOR PRODUCTION THEREOF
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机译:具有超硬度和韧性和优异的耐蚀性的纳米晶奥氏体钢块体材料及其生产方法
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摘要
The invention provides a super hard and tough, nano-crystal austenite steel bulk material having an improved corrosion resistance, and its preparation process.;The austenite steel bulk material comprises an aggregate of austenite nano-crystal grains containing 0.1 to 2.0% (by mass) of a solid solution type nitrogen, wherein an oxide, nitride, carbide or the like of a metal or semimetal exists as a crystal grain growth inhibitor between and/or in said nano-crystal grains.;For preparation, fine powders of austenite steel-forming components, i.e., iron and chromium, nickel, manganese, carbon or the like are mixed with a substance that becomes a nitrogen source. Mechanical alloying (MA) is applied to the mixture, thereby preparing nano-crystal austenite steel powders having a high nitrogen concentration. Finally, the austenite steel powders are consolidated by sintering by means of spark plasma sintering, rolling or the like.
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