>
Fa   |   Ar   |   En
   The Structure-Property Relationship in A Desulfurised and Degassing Hot Work W500 Tool Steel  
   
نویسنده Kalantar .M ,Ghasemi .S.S ,Saadati .M.H
منبع International Journal Of Iron And Steel Society Of Iran - 2011 - دوره : 8 - شماره : 1 - صفحه:19 -25
چکیده    The effect of secondary steelmaking processes such as desulphurization, removal of inclusions and vacuumdegassing followed by hot forging and hardening heat treatment on the microstructure and mechanical propertiesof a hot-work w500 tool steel have been studied in details. in order to follow the progress of secondary steelmaking, the content of impurity elements such as s, p, o, h and n were measured. these elements influence themechanical testing and the microstructure of the steel. the results show that desulfurization treatment can beaccelerated at higher temperature of 1680 °c and 15 minutes holding time for silicon and aluminum with contentsof 0.33% and 0.056% in the molten steel, respectively. in this condition, the removal percentage of sulfur hasbeen reached to about 90% relative to the initial sulfur content. for the degassing sample a, the strength and thehardness, after hot working and quenching – tempering, have been increased from 976 to 2020 mpa and 29 to 52rc, respectively. whereas for the normal sample b, the associated strength and the hardness have been changedfrom 870 to 1845 mpa and 21 to 55 rc, respectively. the difference between mechanical properties of sample aand sample b cab be related to the presence of al2o3 clusters, silicate inclusions, and a longer filamentary inclusionin the microstructure of sample b after hot-forging. microstructural observations show that the morphology ofpearlite in the forged sample a is more uniform and carbide particles are also much finer than these particles in thenon-degassing forged sample b.
کلیدواژه Secondary Steel Making ,Hot Work W500 Tool Steel ,Heat Treatment ,Mechanical Properties ,Microstructure
آدرس دانشگاه یزد, Department Of Materials Engineering, Faculty Of Mining And Metallurgy, Yazd University, Yazd, Iran, ایران, دانشگاه یزد, Department Of Materials Engineering, Faculty Of Mining And Metallurgy, Yazd University, Yazd, Iran, ایران, دانشگاه یزد, Department Of Materials Engineering, Faculty Of Mining And Metallurgy, Yazd University, Yazd, Iran, ایران
 
     
   
Authors
  
 
 

Copyright 2023
Islamic World Science Citation Center
All Rights Reserved