A method for heat treatment on uppermost surface of spheriodal graphite castiron and heat treated spheriodal graphite castiron thereby
A ductile iron, top surface technology, applied in solid-state diffusion coating, coating, metal material coating technology and other directions, can solve problems such as unfavorable and inability to show surface treatment effects
Inactive Publication Date: 2020-07-14
HYUNDAI MOTOR CO LTD +1
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Problems solved by technology
Specifically, although the pearlite portion has high toughness and tensile strength, when the oxynitridation heat treatment is performed on the ductile iron, a compound layer is unfavorably formed due to the pearlite on the surface of the ductile iron, so that due to the thickness of the compound layer formed It is at 1 / 2 to 1 / 3 level compared with conventional carbon steel, but cannot show surface treatment effect
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[0042] Hereinafter, the present invention will be described in detail. However, the present invention is not limited or limited to the exemplary embodiments, the objects and effects of the present invention will be naturally understood or will become apparent from the following descriptions, and are not limited to only the following descriptions. Also, in the description of the present invention, when it is determined that the detailed description of known technologies related to the present invention will unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.
[0043] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular form "a, an, the" is also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprising", "comprising", and "having" used in the s...
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Abstract
Disclosed are a method for heat-treating a surface of a spheroidal graphite cast iron, particularly, heat-treating an uppermost surface of spheroidal graphite cast iron, and spheroidal graphite cast iron heat-treated by the same. The method may include first heat treating for forming ferrite and second heat treating for oxy-nitriding. The spheroidal graphite cast iron heat-treated includes an oxidation layer and a compound layer having a thickness of about 15 to 30 [mu]m, which may be uniform. The method of the heat-treating may decrease the pearlite fraction in the uppermost surface of spheroidal graphite cast iron and increase the ferrite fraction by forming ferrite, thereby forming a compound layer having a thickness of about 15 to 30 [mu]m during an oxy-nitriding heat treatment.
Description
[0001] Cross References to Related Applications [0002] This application claims priority under 35 U.S.C. §119 to Korean Patent Application No. 10-2019-0001485 filed with the Korean Intellectual Property Office on January 7, 2019, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a method of heat-treating the surface of ductile iron, such as the uppermost surface of ductile iron, and ductile iron heat-treated thereby. Specifically, the method may include oxynitridation heat treatment (second heat treatment) of the uppermost surface of the ductile iron. Background technique [0004] In order to ensure wear resistance and strength, various surface treatments such as high frequency, oxynitride and phosphate coating have been applied to steel materials used in various parts of automobiles. [0005] For example, oxynitridation heat treatment improves wear and corrosion resistance by introducing...
Claims
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IPC IPC(8): C21D1/78C21D5/00C23C8/32C23C8/18C22C37/04C22C37/10
CPCC21D1/78C21D5/00C23C8/32C23C8/18C22C37/04C22C37/10C23C8/02C23C8/10C23C8/28C23C8/80C23C8/30C21D8/0257C21D2211/005
Inventor 权恩秀李衡国沈容辅
Owner HYUNDAI MOTOR CO LTD