Date of Publication:2022-10-10
Journal:中国激光
Affiliation of Author(s):机械工程学院
Volume:41
Issue:7
Page Number:0703012
ISSN No.:0258-7025
Abstract:Thermal stress caused by oversized temperature gradient in the process
of laser cladding ceramic coating on metal substrate usually makes the
coating cracked.Reducing the temperature gradient of the laser cladding
process can reduce the thermal stress to a certain degree to suppress
the generation of cracks.Through numerical simulation of temperature
distribution during laser cladding Al_2O_3 coating on Ti6Al4V
substrate,a method of providing preheating and slow-cooling using top
hat laser beam is proposed.Temperature distribution and temperature
gradient of the coating with preheating and slow-cooling are discussed
by changing the spot size and power density of the top hat assistant
laser beam.The results show that there is a significant feature of
preheating and slow-cooling during the cladding process,the top hat
assistant laser beam can reduce the temperature gradient effectively.The
temperature gradient of the plastic point(1533 K)of Al_2O_3reduces while
the preheating and slow-cooling temperature raises.But the temperature
gradient of the plastic point will rebound when the preheating and
slow-cooling temperature is near the plastic point.Higher preheating and
slow-cooling temperature make the cladding process better,but
temperature around the plastic point should be avoided.
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Associate Professor
Supervisor of Doctorate Candidates
Supervisor of Master's Candidates
Gender:Male
Alma Mater:大连理工大学
Degree:Doctoral Degree
School/Department:机械工程学院
Discipline:Mechanical Manufacture and Automation
Business Address:机械工程学院新大楼5031
Contact Information:15104053320
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