Abstract—The process of nitriding is commonly used in electronic hardware besides the automotive components. So far, there are still gains no optimum result. The atom diffusivity homogeneity effects on the material surface mechanical characteristics are yet to be done. The effecting factors like the composition of the chemicals elements in the materials are needed to be observed. In this paper the nitriding process on three types of tool steel materials with a different chemical composition was observed. The nitriding temperature and time is 550 0C and 4 hours, respectively. The white layer formed on the surface was indentified connected to their mechanical properties. The result showed that the hardness of materials is strongly affected by the stability or the homogeneity of the white layer in the surface. The homogeneity is strongly influenced by the chemical elements composition in materials. The highest hardness level, 975.5 HV occurs at the AISI P20 which shows the most homogeneous thickness surface due to Chrom composition of 2%. The next hardness level, 751.2 HV takes place in the AISI 4340 steel with 1.4 % Cr composition, and the lowest hardness, 720.8 HV occurs at the AISI 4140 with 1.07% Chrom.
Index Terms—Chemical composition, nitriding, white layer, tool steel.
K. A. Widi and I. N. G. Wardana are with Department of Mechanical Engneering Brawijaya University, East Java Indonesia (e-mail: email@example.com; firstname.lastname@example.org).
W. Sujana is Senior lecturer at the National Istitute of Technology, Malang, East Java, Indonesia (e-mail : email@example.com).
Cite:K. A. Widi, I. N. G. Wardana, and W. Sujana, "The Effect of Chemical Compositions of Tool Steel on the Level of White Layers Homogeneity and the Surface Hardness," International Journal of Materials, Mechanics and Manufacturing vol. 1, no. 2, pp. 114-116, 2013.