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Vol.40, No.3, 245 ~ 252, 2002
Title
Research Papers / Transformations : Phase Transformation and Precipitation Behavior of High Nitrogen 13%Cr Martensitic Stainless Steel
이윤용Yun Yong Lee,최점용Jeom Yong Choi
Abstract
The substitution of carbon by nitrogen was employed to prevent center segregation of carbides during continuous casting of 13%Cr martensitic stainless steel. Characteristics of phase transformation and precipitation behavior have been studied. The substitution of carbon by nitrogen in 13%Cr steel increases its solidus, Ac_1, and Ms temperatures. The nose temperature of TTT diagram of high carbon steel was 675-700℃ while the one of high nitrogen steel was about 725℃. Maximum hardness can be obtained by austenitizing treatment at 1050-1100℃ for the high carbon steel and 1000℃ for the nitrogen added steel. The secondary hardening was maximized by tempering at 500℃. It is due to the precipitation of fine carbide and M_2N nitride. The hardness was drastically decreased as tempered at 550℃ by precipitation of M_23C_6 carbide at prior austenite grain boundaries.
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