Influence of Heat Treatment Process on Microstructure and Properties of 65Mn Material
The properties and microstructure of 65Mn materials after vacuum furnace quenching+vertical pit furnace tempering and salt-bath furnace quenching+vertical pit furnace tempering were compared and analyzed by using a Rockwell hardness tester and an optical microscope.The results show that after vacuum furnace quenching and vertical pit furnace tempering,the hardness of material is low,which is HRC30～35,and the microstructure is martensite,bainite,ferrite and carbide.After salt bath furnace quenching and vertical pit furnace tempering,the hardness of material is high,which is HRC50～55,and the microstructure is martensite and a small amount of ferrite and carbide.The reason for the low hardness caused by vacuum furnace tempering and vertical pit furnace tempering is that the quenching transfer time during vacuum furnace quenching is long(about 40s),resulting in insufficient austennitization of the material and low hardness of the parts after quenching.
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