Study on the Plasma Beam Surface Remelting Modification of Nodular Cast Iron

Li Yang; Gang Li

doi:10.4028/www.scientific.net/AMR.152-153.1751

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 152-153Study on the Plasma Beam Surface Remelting...

Study on the Plasma Beam Surface Remelting Modification of Nodular Cast Iron

Abstract:

To improve the wear resistance of ductile cast iron, plasma beam remelt-solidified hardening on the surface is adopted. Scanning electron microscope and micro-hardness tester is used to analyze the microstructure and performance for plasma beam remelt-solidified layer of nodular cast iron. The results show that micromelted-solidified hardening of the nodular cast iron surface can be obtained when the operating current is up to 50A. Along with the operating current increases, the width and depth of remelt-solidified layer and hardened layer increase, but the hardness goes down. After the hardening, graphite phase in remelt-solidified region is vanishing. The microstructure of remelt-solidified region is tiny ledeburite and remained austenite and of transformation hardening region is acicular martensite, remained austenite，spheroid graphite and ferrite .In transition region, martensite shell around nodular graphite appears, which is advantageous to enhance the wear resistance. From the surface to inner, the microhardness declines first and then increases, after achieving the maximum value the hardness slowly drops. The highest microhardness appears at the second-surface layer which has a certain distance to the surface.

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Periodical:

Advanced Materials Research (Volumes 152-153)

Pages:

1751-1754

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.152-153.1751

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Online since:

October 2010

Authors:

Li Yang, Gang Li

Keywords:

Nodular Cast Iron, Plasma Beam, Remelt-Solidified Hardening

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