低温助渗剂Zn对N80套管钢低温渗铝层组织的影响  

Effect of Zn in Pack Powder on Microstructure of Aluminized Layer on N80 Casing Steel at Low Temperature

作　　者：叶晶[1] 王宇[1] 黄敏[1] 

机构地区：[1]西安石油大学材料与科学工程学院,陕西西安710065

出　　处：《热加工工艺》2013年第8期131-134,共4页Hot Working Technology

基　　金：陕西省自然科学基金资助项目(2011JQ6003);陕西省材料加工重点学科(YS30230203);西安石油大学青年科技创新基金资助项目(2011BS005)

摘　　要：选用不同Zn含量配比的包埋渗剂,采用低温粉末包埋法对N80套管钢进行表面渗铝处理,依次对不同渗剂配方下所得到渗层的微观形貌、元素组成和显微硬度进行测试,分析了低温助渗剂Zn对所得渗铝层的影响。结果表明:与渗剂中添加Zn所得渗铝层相比,未添加Zn所得渗铝层均匀、致密,显微硬度较高;渗铝层厚度随Zn含量的改变呈现非线性的变化,当Zn∶Al=40∶60(质量比)时,所得渗铝层的厚度可以达到80μm;不同渗剂配比下所得渗铝层主要由Al元素和Fe元素组成,渗层组织从表面向基体方向Al含量呈梯度减少,当渗剂中加入助渗剂Zn后易生成富含低铝相渗层。Aluminized N80 oil casing steel was packed by different Zn content of pack powder at low temperature. The morphology, element distribution, micmhardness of aluminized N80 casting steel were analyzed using SEM and microhardness equipment. The aluminizing layer obtained without the addition of Zn shows denser, uniformer, and higher microhardness than that obtained by the addition of Zn. The thickness of aluminizing layer shows a non-linear relationship with the change of the addition amount of Zn, as the ratio of Zn and A1 is 40 ： 60, the thickness of aluminizing layer can reach 80 μm. All the aluminizing layers are composed of AI and Fe. From the surface to the matrix, the AI content decreases gradiently in the aluminized layer microstructure. The poor-aluminum phase are obtained with the increase of Zn content in pack powder.

关 键 词：N80套管钢 低温包埋渗铝 Zn含量 渗铝层 

分 类 号：TG156.86[金属学及工艺—热处理]