取向硅钢氧化膜结构对渗氮层深度的影响  

Effect of oxide film structure of grain-oriented silicon steel on depth of nitriding layer

作　　者：许光 朱业超 王自荣[1] 杨秀枝[1] 熊智威 蔡苗 XU Guang;ZHU Yechao;WANG Zirong;YANG Xiuzhi;XIONG Zhiwei;CAI Miao(Technology Center of Hunan Valin Lianyuan Iron and Steel Co.,Ltd.,Loudi 417009,Hunan,China)

机构地区：[1]湖南华菱涟源钢铁有限公司技术中心,湖南娄底417009

出　　处：《钢铁研究学报》2022年第7期694-700,共7页Journal of Iron and Steel Research

摘　　要：低温板坯加热技术生产取向硅钢,其关键点之一在于脱碳退火后要进行渗氮处理。通过控制脱碳气氛,获得不同的氧化膜结构;并进一步分析在近似渗氮量条件下,氧化膜结构对渗氮层深度的影响。结果表明:氧化膜分为外层颗粒状氧化膜和内层层片状氧化膜两部分。随着脱碳气氛露点增加,脱碳板O含量增加,氧化膜厚度增厚、层片状氧化膜占氧化膜总厚度的比例下降,渗氮层深度增加。当层片状氧化膜厚度占比较高时,[N]原子积聚在试样的极表层,形成氮沿厚度方向的单峰分布,渗层较浅。当层片状氧化膜厚度占比较低时,[N]原子会越过该层,而在次表层再次发生积聚;从而除了极表层的氮峰外,在次表层形成一个或多个氮峰,渗层较深。Nitriding treatment after decarburization annealing is one of the key technologies to produce low temperature high permeability silicon steel.By controlling decarburization atmosphere,different oxide film structures were obtained;and then,the effect of oxide film structure on depth of nitriding layer with approximate nitrogen content was studied.The results show that oxide film is divided into two parts:the outer granular oxide film and the inner layered oxide film.As the dew point of decarburization atmosphere increases,the oxygen content of the decarburization plate increases,the thickness of the oxide film increases,the thickness ratio of layered oxide decreases,and the depth of nitriding layer increases.When the thickness ratio of layered oxide film is relatively high,[N] accumulates on the extreme surface of the sample,forms a unimodal distribution of [N] along the thickness direction,and the nitriding layer is relatively thin.When the layered oxide film ratio is relatively low,[N] crosses this layer and accumulates again in the subsurface;thus,in addition to the [N] peak on the extreme surface,one or more [N] peaks form in the subsurface,and the nitriding layer is relatively thick.

关 键 词：取向硅钢 渗氮 氧化膜 脱碳 O含量 N含量 渗氮层 

分 类 号：TG156.1[金属学及工艺—热处理]