Research on Microstructure and Wear Property of 45 Steel Quenched with Different Laser Power

Abstract:

The surface of 45 steel is quenched by CO₂ laser with scanning speed 1000 mm/min and different laser power 1000W, 1200W, 1400W, 1600W and 1800W. Experiments are carried out to analyze microstructure, friction and wear properties of quenched 45 steel. The results show that the quenching layer thickness increases gradually with the increase of laser power,and the maximum value of quenching layer hardness increases first and then decreases. When the laser power is 1600W, the maximum hardness value is 883HV_0.5. But when the laser power is 1800W, the hardness of quenching layer becomes to decrease. The reason is the surface of 45 steel becomes to melt. The wear volume increases first and then decreases too. When laser power is 1600W, the minimum wear volume is 0.08mm³, which is 6.4% to the wear volume of 45 steel matrix without laser quenching. Therefore, better microstructure and properties of 45 steel can be obtained when laser scanning speed is 1000mm/min and laser power is 1600W.

• Periodical: Key Engineering Materials (Volume 861)
• Pages: 35-40
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.861.35
• Online since: September 2020
• Authors: Yu Liu*, Tian Hao Xu, Ying Liu, Hai Cheng Zhang, Xing Xing Li, Guang Bin Chen
• Keywords: 45 Steel, Laser Quenching, Microstructure Structure, Wear Property

References

[1] Xu Binshi, Ma Shining, Liu Shishen, etc. Remanufacturing Engineering in the 21st Century [J], Chinese Mechanical Engineering, 2000,11 (1 - 2): 36 -39.

[2] Yang Liming, Yang Zhiqin. Selection and Design of Mechanical parts [M], Beijing: National Defense Industry Press, (2007).

[3] Han Xiaoming, Gao Fei, Song Baoyun, etc. Effect of friction velocity on friction and wear properties of copper matrix friction materials [J], Journal of friction, 2009,29 (1): 89 -96.

[4] Li Gang, Xiangjun, Kuang Jun, Jia Mengdong. Microstructure and Properties of GCr15 Steel Surface Laser quenching [J], Journal of material Heat treatment, 2010 (4): 129-132.

[5] Xie Zhiyu. Phase transition Mechanism and Application in Laser Heat treatment [J]. Mechanical Manufacturing and Automation, 2003,25-36.

[6] Chen Y.B, Lu J, Ni X.W et al．Plastic penetration during laser heating of a metal plate[J]．Journal of Materials Processing Technology, 2008, 28(10)：9-15.

[7] Zheng Qiguang. Laser Advanced Manufacturing Technology [M]. Wuhan: Huazhong University of Science and Technology Press, (2002).

[8] Amine T, Newkirk J W, Liou F, et al. Microstructural and hardness investigation of tool steel D2processed by laser surface melting and alloying[J]. International Journal of Advanced ManufacturingTechnology, 2014, 73: 1427-1435.

DOI: 10.1007/s00170-014-5882-8

[9] Chen Y.B, Lu J, Ni X.W et al．Plastic penetration during laser heating of a metal plate[J]．Journal of Materials Processing Technology, 2008, 28(10)：9-15.

[10] Wang Junli, Shi Wen. Friction and Wear Properties of Ti/TiN coating on Cr12MoV Steel Surface by Magnetron sputtering [J]. Journal of friction, 2005,25 (2): 126-130.