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Gas Nitriding Behaviour of 34CrAlNi7 Nitriding Steel

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Altinsoy I., Onder K., Celebi Efe F., Bindal C.

Acta Physica Polonica A

2014

vol. 125

issue 2

414-416

In this study, gas nitriding behavior of 34CrAlNi7-10 steel was investigated. Single stage processes were carried out at 500°C, 520C and 540C for 10, 20, 30 h, respectively. Nitrogen activity on surface was controlled by the nitriding potential K_{N} which is known as thermodynamical control parameter for controlled gas nitriding process. The presence of nitrides formed on surface of test material was determined by X-ray diffraction analysis technique. The morphology of nitrided layer was studied by optical microscope. The microhardness of surface of nitrided sample in HV_1 was observed between 975 and 1132. Choosing the right nitriding potentials for each temperature, which give the same nitrogen concentration and activity on surface by using the Lehrer diagram, showed that all the samples had almost the same surface roughness of R_{a} = 0.28-0.32 μm after gas nitriding cycles. The measurements showed that the white layer thickness varies between 4.38 μm and 28.80 μm and the growth of the layer was strongly affected by process time and temperature. Diffusion depths as Nht (HV) for each experiment were determined and compared.

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1 Acta Physica Polonica A

1 2014

1 Altinsoy I.

1 Bindal C.

1 Celebi Efe F.

1 Onder K.

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Gas Nitriding Behaviour of 34CrAlNi7 Nitriding Steel