Active wear and failure mechanisms of TiN-Coated high speed steel and tin-coated cemented carbide tools when machining powder metallurgically made stainless steels |
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Authors: | Laizhu Jiang Hannu HÄnninen Jukka Paro Veijo Kauppinen |
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Affiliation: | (1) AB Sandvik Steel, 81811 Sandviken, Sweden;(2) Laboratory of Engineering Materials, Helsinki University of Technology, 02150 Espoo, Finland;(3) Laboratory of Workshop Technology, Helsinki University of Technology, 02150 Espoo, Finland |
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Abstract: | In this study, active wear and failure mechanisms of both TiN-coated high speed steel and TiN-coated cemented carbide tools
when machining stainless steels made by powder metallurgy in low and high cutting speed ranges, respectively, have been investigated.
Abrasive wear mechanisms, fatigue-induced failure, and adhesive and diffusion wear mechanisms mainly affected the tool life
of TiN-coated high speed steel tools at cutting speeds below 35 m/min, between 35 and 45 m/min, and over 45 m/min, respectively.
Additionally, fatigue-induced failure was active at cutting speeds over 45 m/min in the low cutting speed range when machining
powder metallurgically made duplex stainless steel 2205 and austenitic stainless steel 316L. In the high cutting speed range,
from 100 to 250 m/min, fatigue-induced failure together with diffusion wear mechanism, affected the tool life of TiN-coated
cemented carbide tools when machining both 316L and 2205 stainless steels. It was noticed that the tool life of TiN-coated
high speed steel tools used in the low cutting speed range when machining 2205 steel was longer than that when machining 316L
steel, whereas the tool life of TiN-coated cemented carbide tools used in the high cutting speed range when machining 316L
steel was longer than that when machining 2205 steel.
formerly with the Laboratory of Engineering Materials, Helsinki University of Technology |
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