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公开(公告)号：US09783879B2
公开(公告)日：2017-10-10
申请号：US14394423
申请日：2013-04-17
发明人： Yuichiro Shimizu , Atsushi Kobayashi , Susumu Maeda , Masao Kanayama , Hideki Imataka , Masato Yuya , Yuya Gyotoku , Kiyotaka Akimoto
IPC分类号： C23C8/26 , C21D1/76 , C21D9/32 , C21D1/06 , C22C38/24 , C21D6/02 , C21D9/28 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , F16H55/06
CPC分类号： C23C8/26 , C21D1/06 , C21D1/76 , C21D6/02 , C21D9/28 , C21D9/32 , C21D2201/05 , C21D2211/004 , C21D2221/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/24 , F16H55/06
摘要： A nitrided steel member including an iron nitride compound layer formed on a surface of a steel member having predetermined components, wherein: in X-ray diffraction peak intensity IFe4N (111) of a (111) crystal plane of Fe4N and X-ray diffraction peak intensity IFe3N (111) of a (111) crystal plane of Fe3N, which are measured on a surface of the nitrided steel member by X-ray diffraction, an intensity ratio expressed by IFe4N (111)/{IFe4N (111)+IFe3N (111)} is 0.5 or more; Vickers hardness of the iron nitride compound layer is 900 or less, Vickers hardness of a base metal immediately under the iron nitride compound layer is 700 or more, and a difference between the Vickers hardness of the iron nitride compound layer and the Vickers hardness of the base metal is 150 or less; and a thickness of the iron nitride compound layer is 2 to 17 μm.
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公开(公告)号：US20160244869A1
公开(公告)日：2016-08-25
申请号：US15026158
申请日：2014-09-30
CPC分类号： C23C8/26 , C21D1/06 , C21D9/0056 , C21D9/32 , C23C8/80
摘要： A first nitriding process step is performed in which a steel member is subjected to a nitriding process in a nitriding gas atmosphere having a nitriding potential with which a nitride compound layer having a γ′ phase or an e phase is generated, and thereafter a second nitriding process step is performed in which the steel member is subjected to a nitriding process in a nitriding gas atmosphere having a nitriding potential lower than the nitriding potential in the first nitriding process step, to thereby precipitate the γ′ phase in the nitride compound layer. It is possible to generate the nitride compound layer having a desired phase mode uniformly all over a component to be treated and to manufacture a nitrided steel member high in pitting resistance and bending fatigue strength.
摘要翻译： 进行第一氮化处理步骤，其中钢构件在具有氮化电位的氮化气体气氛中进行氮化处理，氮化物层产生具有γ'相或e相的氮化物层，然后进行第二氮化 进行处理步骤，其中钢构件在氮化气体气氛中在氮化电位低于第一氮化处理步骤中的氮化电位的氮化气体气氛中进行氮化处理，从而在氮化物层中析出γ'相。 可以在整个待处理的部件上均匀地生成具有所需相模的氮化物化合物层，并且制造耐点腐蚀性和弯曲疲劳强度高的氮化钢构件。
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公开(公告)号：US20150053311A1
公开(公告)日：2015-02-26
申请号：US14394423
申请日：2013-04-17
发明人： Yuichiro Shimizu , Atsushi Kobayashi , Susumu Maeda , Masao Kanayama , Hideki Imataka , Masato Yuya , Yuya Gyotoku , Kiyotaka Akimoto
IPC分类号： C23C8/26 , C22C38/22 , C22C38/06 , C21D9/32 , C22C38/02 , C22C38/00 , C21D1/06 , C22C38/24 , C22C38/04
CPC分类号： C23C8/26 , C21D1/06 , C21D1/76 , C21D6/02 , C21D9/28 , C21D9/32 , C21D2201/05 , C21D2211/004 , C21D2221/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/24 , F16H55/06
摘要： A nitrided steel member including an iron nitride compound layer formed on a surface of a steel member having predetermined components, wherein: in X-ray diffraction peak intensity IFe4N (111) of a (111) crystal plane of Fe4N and X-ray diffraction peak intensity IFe3N (111) of a (111) crystal plane of Fe3N, which are measured on a surface of the nitrided steel member by X-ray diffraction, an intensity ratio expressed by IFe4N (111)/{IFe4N (111)+IFe3N (111)} is 0.5 or more; Vickers hardness of the iron nitride compound layer is 900 or less, Vickers hardness of a base metal immediately under the iron nitride compound layer is 700 or more, and a difference between the Vickers hardness of the iron nitride compound layer and the Vickers hardness of the base metal is 150 or less; and a thickness of the iron nitride compound layer is 2 to 17 μm.
摘要翻译： 一种氮化钢构件，其包括在具有预定成分的钢构件的表面上形成的氮化铁化合物层，其中：在Fe4N的（111）晶面的X射线衍射峰强度IFe4N（111）和X射线衍射峰 通过X射线衍射在氮化钢构件的表面上测量的Fe 3 N（111）晶面的强度IFe3N（111）强度比由IFe4N（111）/ {IFe4N（111）+ IFe3N 111）}为0.5以上; 氮化铁层的维氏硬度为900以下，紧接在氮化铁层下面的贱金属的维氏硬度为700以上，氮化铁层的维氏硬度与维氏硬度 贱金属为150以下; 氮化铁层的厚度为2〜17μm。
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公开(公告)号：US20170152591A1
公开(公告)日：2017-06-01
申请号：US15429819
申请日：2017-02-10
CPC分类号： C23C8/26 , C21D1/06 , C21D1/74 , C21D1/76 , C21D9/32 , C21D2201/05 , C21D2221/00 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/44
摘要： A manufacturing method of a nitrided steel member and the nitrided steel member include: performing a nitriding treatment on a steel member made of a carbon steel or an alloy steel in an atmosphere of a nitriding treatment gas in which when the total pressure is set to 1, a partial pressure ratio of NH3 gas is set to 0.08 to 0.34, a partial pressure ratio of H2 gas is set to 0.54 to 0.82, and a partial pressure ratio of N2 gas is set to 0.09 to 0.18, at a flow speed of the nitriding treatment gas set to 1 m/s or more, at 500 to 620° C.; and thereby, forming an iron nitride compound layer having a thickness of 2 to 17 μm on a surface of the steel member.
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公开(公告)号：US10385439B2
公开(公告)日：2019-08-20
申请号：US15026158
申请日：2014-09-30
摘要： A first nitriding process step is performed in which a steel member is subjected to a nitriding process in a nitriding gas atmosphere having a nitriding potential with which a nitride compound layer having a γ′ phase or an ε phase is generated, and thereafter a second nitriding process step is performed in which the steel member is subjected to a nitriding process in a nitriding gas atmosphere having a nitriding potential lower than the nitriding potential in the first nitriding process step, to thereby precipitate the γ′ phase in the nitride compound layer. It is possible to generate the nitride compound layer having a desired phase mode uniformly all over a component to be treated and to manufacture a nitrided steel member high in pitting resistance and bending fatigue strength.
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公开(公告)号：US09988704B2
公开(公告)日：2018-06-05
申请号：US15429819
申请日：2017-02-10
IPC分类号： C23C8/48 , C23C8/26 , C21D1/06 , C21D1/74 , C21D1/76 , C21D9/32 , C22C38/22 , C22C38/44 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06
CPC分类号： C23C8/26 , C21D1/06 , C21D1/74 , C21D1/76 , C21D9/32 , C21D2201/05 , C21D2221/00 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/44
摘要： A manufacturing method of a nitrided steel member and the nitrided steel member include: performing a nitriding treatment on a steel member made of a carbon steel or an alloy steel in an atmosphere of a nitriding treatment gas in which when the total pressure is set to 1, a partial pressure ratio of NH3 gas is set to 0.08 to 0.34, a partial pressure ratio of H2 gas is set to 0.54 to 0.82, and a partial pressure ratio of N2 gas is set to 0.09 to 0.18, at a flow speed of the nitriding treatment gas set to 1 m/s or more, at 500 to 620° C.; and thereby, forming an iron nitride compound layer having a thickness of 2 to 17 μm on a surface of the steel member.
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公开(公告)号：US11359271B2
公开(公告)日：2022-06-14
申请号：US15561286
申请日：2016-03-31
IPC分类号： C23C8/26 , C23C8/80 , C21D1/06 , C22C38/04 , C22C38/24 , C22C38/02 , C22C38/22 , C22C38/18 , C22C38/06 , C21D9/32
摘要： A nitriding treatment method of a steel member, in which a nitriding treatment step is performed in which the steel member is subjected to a nitriding treatment in a nitriding gas atmosphere having a nitriding potential with which a γ′ phase or ε phase iron nitride compound layer is generated on a surface of the steel member, and then, a passing step is performed in which the steel member is made to pass through an atmosphere at 425° C. to 600° C. where the iron nitride compound layer does not grow over five minutes or more, the iron nitride compound layer has the γ′ phase uppermost surface layer, and the γ′ phase is made to precipitate in the iron nitride compound layer by the proportion of 40% or more.
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