高铬马氏体耐热钢中δ铁素体形成及影响因素  

Formation and influence factors of δ ferrite in high Cr martensitic heat resistant steel

作　　者：刘正东[1] 程世长[1] 包汉生[1] 谭舒平[1,2] 

机构地区：[1]钢铁研究总院,北京100081 [2]哈尔滨锅炉厂有限责任公司,黑龙江哈尔滨150046

出　　处：《材料热处理学报》2010年第11期61-67,共7页Transactions of Materials and Heat Treatment

基　　金：国家重点基础研究发展计划("973"计划)(2010CB630804)

摘　　要：利用Thermocalc热力学平衡态相计算和试验研究相结合的方法,研究了高Cr马氏体耐热钢T/P122钢中δ铁素体形成原因,结果显示化学成分和热处理对δ铁素体含量影响明显,是影响δ铁素体形成的关键因素,Cr、V等元素明显增加铬当量(Creq),Cu和C、N等元素提高镍当量(Nieq),利用经验公式,控制Creq<14.91%,Nieq>6.0%,同时热处理温度不超过1200℃,低于γ-Fe→γ-Fe+δ-Fe转变温度,能够避免钢中δ铁素体形成。With thermocalc equilibrium phase calculations and experiments,formation of δ-ferrite in T /P122 high Cr martensitic heat resistant steel was investigated.Results show that chemical composition and heat treatment temperature affect δ-ferrite content obviously.Cr and V elements in the steel increase the Cr equivalent（Creq）and Cu,C,N elements increase Ni equivalent（Nieq）remarkably.Using Creq /iNeq equation to control Creq 14.91% and Nieq 6.0%,and the heat treatment temperature not exceeding 1200 ℃,which is lower than γ-Fe→γ-Fe ＋ δ-Fe transformation temperature,δ-ferrite formation in high Cr matensitic heat resistant steel can be avoided.

关 键 词：高铬 马氏体耐热钢 Δ铁素体 成分 热处理 

分 类 号：TG142.73[一般工业技术—材料科学与工程]