Microscopic Examination of Primary Shear Zone in High Speed Machining of Hardened High Strength Steel

Chun Zheng Duan; Min Jie Wang; Tao Dou

doi:10.4028/www.scientific.net/AMR.97-101.1887

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 97-101Microscopic Examination of Primary Shear Zone in...

Microscopic Examination of Primary Shear Zone in High Speed Machining of Hardened High Strength Steel

Abstract:

The microstructure observation and microhardness measurement were performed on the adiabatic shear bands in primary shear zone in the serrated chips formed during high speed machining of two tempering hardness of hardened high strength steel under different cutting speeds by optical microscope, SEM, TEM and microhardness tester. The investigation results show that two types of adiabatic shear bands are formed as cutting speed increases. One is deformed band with heavy elongated microstructures generated under lower cutting speed, another is transformed band with fine grains under higher cutting speed. The increase of the cutting speed little influences on the microhardness in the transformed bands, and the microhardness in deformed band results from strain hardening, whereas transformation hardening leads to very high microhardness in transformed band.

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Periodical:

Advanced Materials Research (Volumes 97-101)

Pages:

1887-1890

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.97-101.1887

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Online since:

March 2010

Authors:

Chun Zheng Duan, Min Jie Wang, Tao Dou

Keywords:

Adiabatic Shear Band (ASB), High Speed Machining (HSM), Microhardness, Microstructure, Primary Shear Zone

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