公开(公告)号：EP3074542A4

公开(公告)日：2017-11-29

申请号：EP14863663

申请日：2014-11-24

Applicant: UNITED TECHNOLOGIES CORP

Inventor： CHIN HERBERT A ,  HALUCK DAVID A ,  OGDEN WILLIAM P ,  MOULIN MICHAEL A

IPC: C21D1/06

CPC classification number: C21D9/38 ,  C21D1/06 ,  C21D6/002 ,  C21D7/13 ,  C21D2211/008 ,  C23C8/02 ,  C23C8/22 ,  C23C8/32 ,  F16C33/32 ,  F16C33/34 ,  F16C33/62 ,  F16C2204/72 ,  F16C2223/12 ,  F16C2223/16

Abstract: A method for cost effectively case hardening a component formed from a martensitic stainless steel material with a desired metallurgical condition for high temperature, high rolling contact fatigue, corrosion and spall initiation and propagation resistance bearing performance. The method describes a method to significantly reduce the carburization or carbo-nitriding process times for appreciable reduction in manufacturing cost. The Method includes the steps of: forming the component from a martensitic stainless steel material having an ASTM grain size of 9 or finer; and subjecting the component to one of a carburization and a carbo-nitriding treatment with significantly lower case hardening times for manufacturing cost-effectiveness.

公开(公告)号：EP2888384A4

公开(公告)日：2015-08-26

申请号：EP13831687

申请日：2013-06-28

Applicant: UNITED TECHNOLOGIES CORP

Inventor： DEMICHAEL THOMAS ,  DAS GOPAL ,  MOULIN MICHAEL A

IPC: C22F1/18 ,  C21D1/62 ,  C22C14/00 ,  C22C21/00

CPC classification number: C22F1/183 ,  C21D1/62 ,  C21D2221/00 ,  C22C14/00 ,  C22C21/00 ,  C22F1/18

Abstract: A method for forming a part having a dual property microstructure includes the steps of: forming a blank having a narrow top portion and a wide base portion; heating the blank to an elevated temperature; and forming a dual property microstructure in the blank by cooling different portions of the blank at different cooling rates.