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The effects of chemical compositions,especially silicon and chromium contents,on the complete decarburization behaviors of steels in atmosphere of 2 vol.% O_2 and 98vol.%N_2 were investigated by using a simultaneous thermal analyzer.Complete decarburization was observed at both 750 and 800 ℃ for 60Si2 Mn A steel,while 750 ℃ only for 92 A steel.For GCr15 steel,no decarburization was found at 750 or 800 ℃,and only partial decarburization was observed at 850 ℃.It indicates that silicon promotes while chromium prevents the complete decarburization of steels in atmosphere with 2 vol.%O_2.The main reason is that silicon increases while chromium reduces the equilibrium concentration of ferrite at the interface of ferrite and austenite,which results in the complete decarburization.
The effects of chemical compositions, especially silicon and chromium contents, on the complete decarburization behaviors of steels in atmosphere of 2 vol.% O_2 and 98 vol.% N_2 were investigated by using a simultaneous thermal analyzer. Complete decarburization was observed at both 750 and 800 ℃ for 60Si2 Mn A steel, while 750 ℃ only for 92 A steel.For GCr15 steel, no decarburization was found at 750 or 800 ℃, and only partial decarburization was observed at 850 ℃ .It indicates that silicon promotes while chromium prevents the complete decarburization of steels in atmosphere with 2 vol.% O 2. The main reason is that silicon growing while chromium reduces the equilibrium concentration of ferrite at the interface of ferrite and austenite, which results in the complete decarburization.