稀土元素铈对204Cu不锈钢组织与性能的影响
发布时间：2018-12-27 10:01
【摘要】：随着现代社会和工业的迅速发展，不锈钢的使用量与日俱增。在不锈钢性能基本不变的条件下，对不锈钢的成本进行控制已经成为了目前不锈钢产业急需解决的问题之一。在该背景下，200系列不锈钢应运而生，200系列不锈钢是以锰、氮代替部分镍的奥氏体不锈钢，其已经在各个领域取得广泛的应用。稀土元素在钢中能够与其他的合金元素作用来改善其综合性能，我国作为稀土产量大国，通过向不锈钢中添加微量稀土元素Ce，研究稀土Ce对其综合性能的影响对于不锈钢产业的发展具有十分重要的作用。 本研究是在204Cu不锈钢中加入一定含量的稀土Ce，研究稀土Ce对204Cu不锈钢组织和性能的影响。通过微观组织观察以及夹杂物形状与成分的分析，研究了稀土元素铈对204Cu不锈钢组织与夹杂物的影响；通过周期浸润实验、电化学实验以及晶间腐蚀实验等方法研究稀土Ce对204Cu不锈钢耐腐蚀性能的影响。通过常温拉伸、冲击实验研究了稀土Ce对204Cu不锈钢力学性能的影响。 实验结果表明：稀土Ce加入到钢中以后可以使晶粒细化，且晶粒细化的程度随着钢中稀土Ce含量的提高而逐渐增大。稀土Ce加入到204Cu不锈钢中以后，对钢中的夹杂物起到了变质作用，改变了夹杂物的形态及成分。但是当钢中稀土Ce含量超过特定的范围时，会产生尺寸较大的稀土复合夹杂物，使204Cu不锈钢的耐腐蚀性能及力学性能出现下降。随着钢中稀土Ce含量的提高，逐步改善了204Cu不锈钢的耐腐蚀性能，但是当钢中稀土Ce含量超过0.029%时，实验钢的耐腐蚀性能出现了一定程度的降低。添加适量稀土Ce能够显著的提高204Cu不锈钢的力学性能，当钢中稀土Ce含量为0.029%时，204Cu不锈钢能够得到最好的力学性能。
[Abstract]:With the rapid development of modern society and industry, the use of stainless steel is increasing. The cost control of stainless steel has become one of the most urgent problems in stainless steel industry. Under this background, 200 series stainless steel emerges as the times require. 200 series stainless steel is austenitic stainless steel with manganese and nitrogen instead of some nickel. It has been widely used in various fields. Rare earth elements can interact with other alloying elements in steel to improve their comprehensive properties. As a large rare earth producing country, China adds trace rare earth element Ce, to stainless steel. It is very important for the development of stainless steel industry to study the influence of rare earth Ce on its comprehensive properties. The effect of rare earth Ce on the microstructure and properties of 204Cu stainless steel was studied by adding a certain amount of rare earth Ce, to 204Cu stainless steel. The effect of rare earth element cerium on the microstructure and inclusions of 204Cu stainless steel was studied by means of microstructure observation and analysis of the shape and composition of inclusions. The effect of rare earth Ce on the corrosion resistance of 204Cu stainless steel was studied by means of periodic soakage experiment, electrochemical test and intergranular corrosion test. The effect of rare earth Ce on mechanical properties of 204Cu stainless steel was studied by tensile and impact tests at room temperature. The experimental results show that the addition of rare earth Ce to the steel can refine the grain size, and the degree of grain refinement increases with the increase of the content of rare earth Ce in the steel. After the addition of rare earth Ce into 204Cu stainless steel, the inclusions in the steel were modified, and the shape and composition of the inclusions were changed. However, when the content of rare earth Ce in the steel exceeds a specific range, the large size rare earth composite inclusions will be produced, which will decrease the corrosion resistance and mechanical properties of 204Cu stainless steel. With the increase of rare earth Ce content in steel, the corrosion resistance of 204Cu stainless steel was improved gradually, but when the content of rare earth Ce in steel exceeded 0.029, the corrosion resistance of experimental steel decreased to a certain extent. The mechanical properties of 204Cu stainless steel can be significantly improved by adding a proper amount of rare earth Ce. When the content of rare earth Ce in the steel is 0.029, the best mechanical properties of 204Cu stainless steel can be obtained.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG142.71
本文编号：2392897
[Abstract]:With the rapid development of modern society and industry, the use of stainless steel is increasing. The cost control of stainless steel has become one of the most urgent problems in stainless steel industry. Under this background, 200 series stainless steel emerges as the times require. 200 series stainless steel is austenitic stainless steel with manganese and nitrogen instead of some nickel. It has been widely used in various fields. Rare earth elements can interact with other alloying elements in steel to improve their comprehensive properties. As a large rare earth producing country, China adds trace rare earth element Ce, to stainless steel. It is very important for the development of stainless steel industry to study the influence of rare earth Ce on its comprehensive properties. The effect of rare earth Ce on the microstructure and properties of 204Cu stainless steel was studied by adding a certain amount of rare earth Ce, to 204Cu stainless steel. The effect of rare earth element cerium on the microstructure and inclusions of 204Cu stainless steel was studied by means of microstructure observation and analysis of the shape and composition of inclusions. The effect of rare earth Ce on the corrosion resistance of 204Cu stainless steel was studied by means of periodic soakage experiment, electrochemical test and intergranular corrosion test. The effect of rare earth Ce on mechanical properties of 204Cu stainless steel was studied by tensile and impact tests at room temperature. The experimental results show that the addition of rare earth Ce to the steel can refine the grain size, and the degree of grain refinement increases with the increase of the content of rare earth Ce in the steel. After the addition of rare earth Ce into 204Cu stainless steel, the inclusions in the steel were modified, and the shape and composition of the inclusions were changed. However, when the content of rare earth Ce in the steel exceeds a specific range, the large size rare earth composite inclusions will be produced, which will decrease the corrosion resistance and mechanical properties of 204Cu stainless steel. With the increase of rare earth Ce content in steel, the corrosion resistance of 204Cu stainless steel was improved gradually, but when the content of rare earth Ce in steel exceeded 0.029, the corrosion resistance of experimental steel decreased to a certain extent. The mechanical properties of 204Cu stainless steel can be significantly improved by adding a proper amount of rare earth Ce. When the content of rare earth Ce in the steel is 0.029, the best mechanical properties of 204Cu stainless steel can be obtained.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG142.71
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