Open AccessEffects of deep cryogenic treatment on the microstructure and friction performance of M35 high-speed steel
Author(s) -
Jingwen Liao,
Liejun Li,
Jihua Peng,
Jixiang Gao
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1676/1/012098
Subject(s) - cryogenic treatment , microstructure , materials science , high speed steel , rockwell scale , carbide , metallurgy , wear resistance , precipitation , indentation hardness , ball (mathematics) , composite material , mathematics , mathematical analysis , physics , meteorology
The tempered M35 samples were deep-cryogenically treated (DCT) at temperature - 240°C for a long time. The microstructure and hardness were characterized by SEM, and Rockwell together with Vicker’s indenter respectively. The wear resistance was tested by a ball-on-disc friction and wear testing against Si3N4 balls. Comparing to high-speed steel without further treatment, the size of grains was reduced to 9.94 μm and promoted the formation of carbides after DCT. However, it was found that the hardness of the samples before and after DCT kept almost the same. Under high load, the wear resistance was slightly improved. This was probably responsible for carbides precipitation and Co precipitated from the α-Fe matrix during DCT.