表面纳米化对1Cr17不锈钢耐氧化性的影响  

The effect of surface nanocrystallization on oxidation resistance of 1Cr17 stainless steel

作　　者：任瑞铭[1] 陈春焕[1] 栾卫志[1] 杨德新[1] 

机构地区：[1]大连交通大学材料科学与工程学院,辽宁大连116028

出　　处：《材料热处理学报》2007年第B08期188-192,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(50171017);大连市基金国家(2005J22JH014)

摘　　要：用热重仪(TGA)、X-射线衍射(XRD)、扫描电镜(SEM)及其能谱(EDX),研究了表面纳米化对1Cr17不锈钢在700℃水蒸气中耐氧化性的影响。氧化动力学表明,在氧化开始阶段,表面纳米化后氧化速度高于原始样品,与传统喷丸处理后的耐氧化性能相当,但在氧化2小时时就很快达到钝化,氧化速度明显低于原始样品和经传统喷丸的样品。无论是否纳米化处理和经过传统喷丸处理,高温氧化时都在表面都形成了(FeCr)_2O_3型氧化物。但表面纳米化后由于表层高密度的晶界为Cr原子的扩散提供了快速通道,使得(FeCr)_2O_3型氧化物中Cr的浓度迅速提高,形成了致密的Cr_2O_3层,使得耐氧化性能提高。The effect of surface nanocrystallization on oxidation resistance of 1Cr1 7 stainless steel was investigated by TGA, XRD, SEM with EDX. The oxidation dynamics showed that at the initial oxidation stage the oxidation rate of the nanocrystallized surface is higher than that of the untreated surface, and almost the same as that of the traditional shot-peened surface. But after about 2 hours later the passivation occurs, and the oxidation rate is much lower than that of the untreated and the traditional shot peened. The （FeCr）203 formed on the surface of all samples in the oxidation process, but the boundaries high in density in the surface nanocrystallization samples provide fast diffusion paths for Cr atoms, which promoted the Cr content in （FeCr）2O3 increased quickly. Therefore the dense Cr2O3 layer formed, and the oxidation resistance increase.

关 键 词：高温氧化 表面纳米化 选择性氧化 1Cr17不锈钢 

分 类 号：TG174[金属学及工艺—金属表面处理]