Laser quenching and ion sulphidizing complex surface treat technology for diesel engine cylinder

Abstract

In order to solve the problem of wear-out-failure of diesel engine cylinder, the laser-quenching and low temperature ion sulfurizing complex surface treatment technology was operated on the surface of 42MnCr52 steel. And the tribological properties of the complex layer were investigated. The experimental results indicated that the complex layer was composed of soft surface sulphide layer and sub-surface laserquenching harden layer, and showed excellent friction-reduction and wear-resistance performance at high temperature. The synergistic effect of the complex layer resulted in 20% increase in hardness, 10% reduction in friction coefficient and 50% reduction in wear weight loss, respectively, compared with those of the standard samples. The bench-test further demonstrated that this technology can improve the lubricating condition between cylinder and piston ring, and reduce both abnormity wear when the lubricating oil is deficiency at the time of start-up and sticking wear at high temperature during the operating period, and then prolong the service life of engine.

Keywords

cylinder / laser quenching / ion sulphidizing / friction and wear

References

[1] Tang P., Song R., Chai G., . Optimization of Laser Ablation Technology for PDPhSM Matrix Nanocomposite Thin Film by Artificial Neural Networks-particle Swarm Algorithm[J]. Journal of Wuhan University of Technology-Mater. Sci. Ed., 2010, 25(2): 188-193.

[2] Li X., Shining M.A., Hu C., Qiu J., . Research of the Plasma Sulfide Layer Formed on the Nitrocarburizing Layer[J]. Transactions of Materials and Heat Treatment, 2004, 25(5): 428-430.

[3] Lei S., Liu Q., Yuping M.A., . Wear Performance of Laser Surface Hardened GCr15 steel[J]. Journal of Wuhan University of Technology-Mater. Sci. Ed., 2010, 25(1): 84-88.

[4] Guan Y.H., Chen T.L., Wang H.G., . The Prediction of the Mechanical Properties of Metal during Laser Quenching[J]. Journal of Materials Processing Technology, 1997, 63: 614-617.

[5] Bensalah A., Ito M., Guyot Y., Goutaudier C., . Spectroscopic Properties and Quenching Processes of Yb³⁺ in Fluoride Single Crystals for Laser Applications[J]. Journal of Luminescence, 2007, 122–123: 444-446.

[6] Yang B., Chen G., Zhang K., . A Mechanical Model for the Quantification of the Effect of Laser Quenching on CTOD in Steels[J]. Journal of Materials Processing Technology, 2009, 209: 2 180-2 185.

[7] Zhao J., Zhang P., Han Wenzheng. The Application of Ion Sulphidizing Process to Armored Vehicle[J]. Journal of Armored Force Engineering Institute, 2003, 17(1): 10-14.

[8] Qiao Y., Zhao Y., Liu X., . Effect of Sulfurizing Layer on Tribological Properties of Netted Laser-quenching Surface[J]. Journal of Armored Force Engineering Institute, 2010, 24(5): 73-76.