低合金钢中合金元素高温氧化行为研究

Research on alloy elements high temperature oxidation character of low alloy steel

对低合金钢进行了900～1 200℃高温氧化实验,对钢中Si、Mn、Cu、Cr和Ni等合金元素的高温氧化行为进行了研究。结果表明：高温下Si元素与Cu元素存在明显的富集,Si元素会氧化生成Fe2SiO4,阻碍铁离子在氧化铁皮中的扩散,使钢具有一定的抗氧化性;Cu元素可以改善钢的强度、韧性与耐腐蚀性,但是高温氧化后极易形成＂富铜液相＂,导致出现＂铜脆＂现象;在1 200℃下,Cr元素和Ni元素也会发生富集,Cr在高温下会在氧化铁皮和基体钢之间形成FeCr2O4,同样具有一定的抗氧化性;Mn的氧化物与Fe的氧化物很相似,两者相应氧化物有很高的互溶度;Ni元素对氧化过程没有较大的影响。

The high temperature oxidation character of Si、Mn、Cu、Cr and Ni etc.alloy elements of low alloy steel is researched by experiments.The research results show that at high temperature,Si and Cu elements exist obvious enrichment,Si element will be oxidized to Fe2SiO4.It can hinder the diffusion of iron ions from oxidation,and make steel with a certain oxidation resistance.Cu element can improve the strength,toughness and corrosion resistance of steel,but it easy to form ＂rich copper liquid＂ after the high temperature oxidation,resulting in ＂copper brittle＂ phenomenon.Under 1 200℃,the enrichment of Cr and Ni elements will also occur,Cr in the high temperature will form FeCr2O4 between oxidation scale and steel matrix,also has certain oxidation resistance.The oxidation of Mn element is similar to Fe element,the two corresponding oxidations have high mutual solubility.Ni element is not great influence for oxidation process.