|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||075/246; 075/232; 075/244|
|§371/§102 date||20060213 (20060213)|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 8 인용 특허 : 4|
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 ...
What we claim is: 1. A super hard and tough austenite steel bulk material with an improved corrosion resistance, comprising an aggregate of austenite nano-crystal grains containing 0.1 to 2.0% (by mass) of nitrogen in solid-solution wherein said austenite nano-crystal grains are obtained by mechanical alloying (MA) using a ball mill or the like, and wherein some amount of a metal oxide or a semi-metal oxide is inevitably formed on the surface of MA powder products during MA processing, acting as a crystal grain growth inhibitor between or in said nanocr...