铌对00Cr12Ni不锈钢组织和性能的影响

来源期刊：钢铁2011年第7期

论文作者：陈旭 郑淮北 叶晓宁 姜传海 江来珠

文章页码：75 - 78

关键词：金属材料； 铁素体不锈钢； 显微组织； 再结晶； 冲击韧性

Key words：metallic material； ferritic stainless steel； microstructure； recrystallization； impact toughness

摘    要：分别冶炼了3种不同铌含量的00Cr12Ni不锈钢,用光学显微镜和透射电镜观察了热轧退火态的显微组织,测量了试验钢的拉伸性能和不同温度的冲击功。试验结果表明:铌的添加显著抑制了退火时铁素体再结晶的发生。未添加稳定化元素铌的钢中析出相为Cr₂₃C₆,w(Nb)为0.28%的试验钢中析出相为Nb(C,N)和Fe₃Nb₃C,w(Nb)为0.49%的试验钢中析出相为Nb(C,N)和Fe₂Nb,而且其析出相总体积分数明显高于其他2种试验钢。铌的添加提高了试验钢的强度,降低了试验钢的塑性和韧性,w(Nb)为0.49%的试验钢冲击功最低,但其韧脆转变温度也最低。

Abstract: There 00Cr12Ni stainless steels were smelt with different niobium contents.Microstructure after hot rolling and annealing was observed with optical microscope and transmission electron microscope.Tensile properties of the tested steels and their impact energies at different temperatures were measured.The results indicate that ferrite recrystallization during annealing is obviously hindered by niobium addition.Precipitated phases in steel without niobium addition are Cr₂₃C₆,but the primary precipitated phases in steel containing niobium of 0.28% are Nb(C,N) and Fe₃Nb₃C.Precipitated phases in steel containing niobium of 0.49% are Nb(C,N) and Fe₂Nb,and the total volume fraction of precipitated phases in these steels are evidently higher than those in the others.The strength was improved with niobium addition,but the plastic and toughness decrease with the increase in niobium content.The impact energies of steel containing niobium of 0.49% is the lowest,but its ductile-brittle transition temperature is also the lowest.