Laser fusion of the surface of cast iron with scanning of the beam
- 21 Downloads
In fusion of the surface of gray iron by a laser beam with scanning the thickness of the fused layer with a constant scanning frequency is proportional to the parameter P/(dv)0.4, where P, d, and v are the power, diameter, and rate of linear movement of the laser beam, respectively. This relationship was obtained in solution of the threedimensional problem of laser heating.
The zone of laser fusion of the iron has a dispersed dendritic structure and the phase composition is an α+γ+Fe3C mixture. With a change in rate of movement of the specimen (v) from 1.7 to 10 mm/sec the quantity of the phases in the remelted layer remains practically constant. With scanning the quantity of the phases does not change in comparison with treatment without scanning. With an increase in rate the carbon content in the austenite increases from 1.2 to 1.5%. The microhardness of the zone of fusion does not depend upon v and is 900–1000 H.
KeywordsIron Austenite Laser Beam Carbon Content Phase Composition
Unable to display preview. Download preview PDF.
- 1.D. N. H. Trafford, I. Bell, J. H. P. C. Megaw, and A. S. Bransden, "Heat treatment using a high-power laser," in: Heat Treatment 81: Proceedings of the International Conference, Birmingham (15–16 Sept. 1981), London (1983), pp. 189–206, Discussion pp. 220–225.Google Scholar
- 2.V. S. Kraposhin, "Heat treatment of steel and alloys with the use of a laser beam and other progressive forms of heating," in: Metallurgy and Heat Treatment: The Results of Science and Technology [in Russian], Vol. 21, Vsesoyuz. Inst. Nauch. i Tekh. Inf. Akad. Nauk SSSR, Moscow (1987), pp. 144–206.Google Scholar
- 3.V. S. Ivanii, O. M. Ivasishin, and N. V. Sviridenko, "Quantitative phase analysis of textured titanium alloys," Zavod. Lab., No. 4, 47–50 (1986).Google Scholar
- 4.E. Vogt and G. Frommyer, "Solidification parameters and microstructurs of rapidly solidified Fe−Si and Fe−C melt spun ribbons," Z. Metallkunde,8, No. 4, 262–267 (1987).Google Scholar
- 5.J. C. Hawkes, W. M. Steen, and D. R. F. West, "Laser surface melt hardening of S. G. irons," in: Proceedings of the First International Conference on Laser Manufacturing (Brighton, 1–3 Nov. 1983), Kempston, Amsterdam, et al. (1983), pp. 97–108.Google Scholar
- 6.S. Kon, D. K. Sun, and Y. P. Le, "A fundamental study of laser transformation hardening," Met. Trans.,14A, 643–653 (1983).Google Scholar
- 7.M. C. Ruhl and M. Cohen, "Split quenching of Fe−C alloys," Trans. Met. Soc. AIME,245, No. 2, 241–251 (1969).Google Scholar
- 8.V. M. Andriyakhin, N. V. Edneral, Kh. A. Mazorra, et al., "Structural and phase changes in the surface layers of gray irons treated by the radiation of a laser," Izv. VUZ. Chern. Met., No. 7, 91–94 (1981).Google Scholar