A Descriptive Study of the Hardness and Microstructure Profiles of SKD61 Steel Plunger Tip (Local Material) after Plasma Nitriding

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A Descriptive Study of the Hardness and Microstructure Profiles of SKD61 Steel Plunger Tip (Local Material) after Plasma Nitriding

July 2, 2021 Engineering 0

After Plasma Nitriding, the hardness and microstructure profiles of SKD61 Steel Plunger Tip (local material) were investigated. A plunger tip can be hardened through surface treatment using a plasma/ion nitriding technique to improve SKD61 quality for high temperature use. The nitriding temperature was varied from 350oC to 550oC with 50oC steps for the nitriding process completed for 10 hours to test the success of the surface treatment. The results show that the optimum surface hardness was obtained when the nitriding temperature was 500oC and the Vickers hardness (HV) was 955.29 HV with a depth of up to 100 m from the specimen’s surface. At such a nitriding temperature, the hardness increased 1.79 times when compared to the hardness after hardening alone, and it increased 2.076 times when compared to the initial hardness. According to the study’s findings, plasma nitriding temperature influences the amount of nitrogen concentration diffused into the substrate material. SEM-EDS metallographic observations show that the nitriding temperature affects the concentration and depth of nitrogen diffusion in the SKD61 material. The nitride layer that formed could have been composed of Fe N, Cr2N, VN, Fe, and Fe.

Author(s) Details

Prof. Dr. Rer Nat. Usman Sudjadi
Center for Nuclear Fuel Technology, National Nuclear Energy Agency, Indonesia.

R. V. Sinaga
Center for Nuclear Fuel Technology, National Nuclear Energy Agency, Indonesia.

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