FEATURES OF FORMATION MICRORELIEF AND MICROHARDNESS THERMALLY HARDENED ZONES BY SCANNING LASER BEAM

Дмитро А. Лесик, Віталій В. Джемелінський

Abstract


Features of formation of microrelief and microhardness thermally hardened zones as well as width and depth of the heat affected zone overlapped tracks in the cross section of the surface layer of AISI 1045 steel are presented.

Based on theoretical and experimental studies, calculation scheme of laser heat hardening with overlapping tracks and procedure of experimental studies using of fiber laser with 2D scanner are proposed. It is established that as a result of repeated effect of scanning laser radiation microhardness, width and depth of a hardened zone of AISI 1045 steel specimens vary depending on the overlapping ratio. However, regardless of the overlapping ratio is present softening zone with reduced microhardness almost double. The values of surface microhardness in the overlapping zone with increasing overlapping ratio increases as well as decreases in the depth. The optimum values of the overlapping ratio (25%) for obtaining of uniform widths, depths hardened zone and microrelief of the surface layer are determined. A method of obtaining a uniform distribution of microhardness in the softening zone by repeated laser low temperature tempering is suggested. Parameters of roughness Ra and waviness Wa in overlapping zone of laser tracks decreased almost double in comparison with not hardening overlapping zones. Program of control for automation of the process of surface thermal hardening of large dimensional parts by scanning laser beam are developed.

The procedure and results of experimental studies of determination the optimal parameters of scanning laser beam can be used in the industrial conditions for surface thermal hardening of large dimensional parts are presented.


Keywords


surface layer; laser heat treatment; scanning; hardening; zone overlap; tempering; microhardness; microrelief

References


Grigor'janc A. G. Metody poverhnostnoj lazernoj obrabotki (Methods of surface laser processing) / A. G. Grigor'janc, A. N. Safonov – Moscow: Vysshaja shkola, 1987. – 191 p.

Kovalenko V. S. Uprochnenie i legirovanie detalej mashin luchom lazera (Hardening and alloying of machine parts with a laser beam) / V. S. Kovalenko, L. F. Golovko, V. S. Chernenko. - Kyiv: Tehnika, 1990. – 192 p.

Golovko L. F. Lazerni tehnologii' ta komp’juterne modeljuvannja (Laser technology and computer modeling). Kyev: Vistka, 2009, 296 p.

Reinhart Poprawe. Tailored Light 2. Laser Application Technology. Springer-Verlag Berlin, Heidelberg, 2011. pp. 173-241.

Ritesh L., Yang J., Jana S., Tam S. C., The effects of overlapping runs in the laser transformation hardening of tool-steel specimens, Journal of Materials Processing Technology. 23 (1990) pp. 133-147.

Babic M., Balic J., Milfelner M., Belic I., Kokol P., Zorman M., Panjan P., Robot laser hardening and the problem of overlapping laser beam, Advances in Production Engineering and Management. 8 (2013) pp. 25–32.

Mordike B. L., Surface treatment with high power lasers, Laser in Engineering. 4 (1995) pp. 187-200.

Silvia M., Lamikiz A., Tabernero I, Ukar E., Laser hardening process with 2D scanning optics, Physics Procedia. 39 (2012) pp. 309-317.

Dzhemelins'kyj V. V. Vyznachennja optymal'nyh parametriv lazerno-ul'trazvukovogo zmicnennja ta ozdobljuvannja poverhon' vyrobiv (Determining the optimal parameters of laser-ultrasonic hardening and finishing of the surface products) / V. V. Dzhemelins'kyj, D. A. Lesyk // Visnyk NTUU «KPI». Serija mashynobuduvannja. – 2013. - № 2. – С. 15-18.

Ritesh S. Lakhkar, Yung C. Shin, Matthew John M. Krane, Predictive modeling of multi-track laser hardening of AISI 4140 steel, Physics Procedia 480 (2008) pp. 209–217.

Skvarenina S., Shin Y. C., Predictive modeling and experimental results for laser hardening of AISI 1536 steel with complex geometric features by a high power diode laser, Surface and Coatings Technology. 201 (2006) pp. 2256–2269.

Zhang Z., Delagnes D., Bernhart G., Microstructure evolution of hot-work tool steels during tempering and definition of a kinetic law based on hardness measurements, Materials Science and Engineering A. 380 (2004) pp. 222–230.

Yao C., Xu B., Huang J., Zhang P., Wu Y., Study on the softening in overlapping zone by laser-overlapping scanning surface hardening for carbon and alloyed steel, Optics and Lasers in Engineering. 48 (2010) pp. 20–26.


GOST Style Citations


1. Головко Л. Ф. Лазерні технології та комп’ютерне моделювання / Під ред. Л. Ф. Головка, С. О. Лук’яненка. – К. : Вістка, 2009. – 296 с.

 

2. Коваленко В. С. Упрочнение и легирование деталей машин лучом ла¬зера / В. С. Коваленко, Л. Ф. Головко, В. С. Черненко. - К. : Техника, 1990. – 192 с.

 

3. Григорьянц А. Г., Сафонов А. Н. Методы поверхностной лазерной обработки / Под ред. А. Г. Григорьянц, А. Н. Сафонов – М. : Высшая школа, 1987. – 191 с.

 

4. Reinhart Poprawe. Tailored Light 2. Laser Application Technology. Springer-Verlag Berlin, Heidelberg, 2011. pp. 173-241.

 

5. Ritesh L., Yang J., Jana S., Tam S. C., The effects of overlapping runs in the laser transformation hardening of tool-steel specimens, Journal of Materials Processing Technology. 23 (1990) pp. 133-147.

 

6. Babic M., Balic J., Milfelner M., Belic I., Kokol P., Zorman M., Panjan P., Robot laser hardening and the problem of overlapping laser beam, Advances in Production Engineering and Management. 8 (2013) pp. 25–32.

 

7. Mordike B. L., Surface treatment with high power lasers, Laser in Engineering. 4 (1995) pp. 187-200.

 

8. Silvia M., Lamikiz A., Tabernero I, Ukar E., Laser hardening process with 2D scanning optics, Physics Procedia. 39 (2012) pp. 309-317.

 

9. Джемелінський В. В. Визначення оптимальних параметрів лазерно-ультразвукового зміцнення та оздоблювання поверхонь виробів / В. В. Джемелінський, Д. А. Лесик // Вісник НТУУ «КПІ». Серія машинобудування. – 2013. - № 2. – С. 15-18.

 

10. Ritesh S. Lakhkar, Yung C. Shin, Matthew John M. Krane, Predictive modeling of multi-track laser hardening of AISI 4140 steel, Physics Procedia 480 (2008) pp. 209–217.

 

11. Skvarenina S., Shin Y. C., Predictive modeling and experimental results for laser hardening of AISI 1536 steel with complex geometric features by a high power diode laser, Surface and Coatings Technology. 201 (2006) pp. 2256–2269.

 

12. Zhang Z., Delagnes D., Bernhart G., Microstructure evolution of hot-work tool steels during tempering and definition of a kinetic law based on hardness measurements, Materials Science and Engineering A. 380 (2004) pp. 222–230.

 

13. Yao C., Xu B., Huang J., Zhang P., Wu Y., Study on the softening in overlapping zone by laser-overlapping scanning surface hardening for carbon and alloyed steel, Optics and Lasers in Engineering. 48 (2010) pp. 20–26.





DOI: http://dx.doi.org/10.20535/2305-9001.2015.73.40903

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