公开(公告)号：US20180223411A1

公开(公告)日：2018-08-09

申请号：US15947893

申请日：2018-04-09

Applicant: Caterpillar Inc.

Inventor： Zachary S. Birky ,  Michael A. Pershing ,  Thomas E. Clements

IPC: C23C8/26 ,  C23C8/38 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/24 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50 ,  C22C38/56 ,  C22C38/22 ,  C22C38/42

CPC classification number: C23C8/26 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50 ,  C22C38/56 ,  C23C8/38

Abstract: A disclosure is directed to a method for rapidly nitriding steel, the method including: placing the steel in a furnace having an atmosphere comprising partially dissociated ammonia gas; heating the steel to a highest temperature in a range of 400 to 600° C. while holding a nitriding potential below 15 atm−1/2 during heat-up from 400° C. up to the highest temperature; and holding the steel at the highest temperature while continuing to maintain the nitriding potential below 15 atm−1/2, where a total time taken for the heating and holding the steel in the range of 400 to 600° C. during the nitriding is 15 hours or less, and where a composition of the steel comprises at least one of the group consisting of Al, Cr, Mo, V, and Ti.

公开(公告)号：US20160130692A1

公开(公告)日：2016-05-12

申请号：US14934569

申请日：2015-11-06

Applicant: Caterpillar Inc.

Inventor： Zachary S. Birky ,  Michael A. Pershing ,  Thomas E. Clements

IPC: C23C8/26 ,  C22C38/56 ,  C22C38/50 ,  C22C38/46 ,  C22C38/02 ,  C22C38/42 ,  C22C38/24 ,  C22C38/06 ,  C22C38/04 ,  C22C38/22 ,  C22C38/44

CPC classification number: C23C8/26 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50 ,  C22C38/56 ,  C23C8/38

Abstract: A disclosure is directed to a method for rapidly nitriding steel, the method including: placing the steel in a furnace having an atmosphere comprising partially dissociated ammonia gas; heating the steel to a highest temperature in a range of 400 to 600° C. while holding a nitriding potential below 15 atm−1/2 during heat-up from 400° C. up to the highest temperature; and holding the steel at the highest temperature while continuing to maintain the nitriding potential below 15 atm−1/2, where a total time taken for the heating and holding the steel in the range of 400 to 600° C. during the nitriding is 15 hours or less, and where a composition of the steel comprises at least one of the group consisting of Al, Cr, Mo, V, and Ti.

Abstract translation: 本发明涉及一种用于快速氮化氮化的方法，该方法包括：将钢放置在具有包含部分解离的氨气的气氛的炉中; 在400〜600℃的范围内将钢加热至最高温度，同时在400℃升温至最高温度的同时保持氮化电位低于15atm-1/2; 并将钢保持在最高温度，同时继续保持渗氮电位低于15atm-1/2，其中在氮化期间加热和保持钢在400至600℃范围内的总时间为15 小时以下，钢的成分含有Al，Cr，Mo，V，Ti中的至少一种。