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SELECTIVE CASE HARDENING FOR METAL ARTICLES
SELECTIVE CASE HARDENING FOR METAL ARTICLES
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机译：金属制品的选择性案例硬化
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摘要
A selectively case hardened steel article by low temperature carburization includes a body made of a chromium bearing nickel or ferrous based alloy, for example stainless steel, a first portion of the body having a first hardness characteristic, and a second portion of the body having a second hardness characteristic; the second portion being less than the entire body and substantially free of carbides. One method for selective case hardening by low temperature carburization includes the steps of applying a carbon blocking mask over surface areas of the article that are not going to be carburized; activating those surface areas that are to be carburized; diffusing carbon into the activated surface areas at a temperature below which carbides form; and removing the carbon blocking mask.
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