The influence of laser surface hardening on dry sliding wear behaviour of steel ck45

Abstract EN

This paper describes the effect of laser surface treatment on wearesistance of steel Ck45 .A Pulse Nd : YAG laser with wave length 1064 nm and pulse duration 100 ns was used by applying one pulse ,two pulses with different laser energies (500, 750, 1000 mJ).

Pin-on-disc technique was done to define wear rate with different forces 5, 10, 15, 20, 25N) and different sliding speeds (1.319, 2.199, 3.078, 3.958 m / s) for constant time (20 min) and constant rotating disc 720 r.

p.

m with 45HRC .Also defined microhardness which decreases far from the hardened surface , depth of hardening was evaluated through optical microscopy .

The results of this work demonstrated that improvement in wear resistance for 1000 mJ laser energy more than the other energies for one pulse and two pulses, while wear resistance for two pulses more than one pulse for all the energies.

X-ray analysis results show that precipitation of another carbides like iron carbides, chromium carbides, manganese carbides after the treatment by laser.