【摘要】：隨著現(xiàn)代社會和工業(yè)的迅速發(fā)展，不銹鋼的使用量與日俱增。在不銹鋼性能基本不變的條件下，對不銹鋼的成本進(jìn)行控制已經(jīng)成為了目前不銹鋼產(chǎn)業(yè)急需解決的問題之一。在該背景下，200系列不銹鋼應(yīng)運(yùn)而生，200系列不銹鋼是以錳、氮代替部分鎳的奧氏體不銹鋼，其已經(jīng)在各個領(lǐng)域取得廣泛的應(yīng)用。稀土元素在鋼中能夠與其他的合金元素作用來改善其綜合性能，我國作為稀土產(chǎn)量大國，通過向不銹鋼中添加微量稀土元素Ce，研究稀土Ce對其綜合性能的影響對于不銹鋼產(chǎn)業(yè)的發(fā)展具有十分重要的作用。 本研究是在204Cu不銹鋼中加入一定含量的稀土Ce，研究稀土Ce對204Cu不銹鋼組織和性能的影響。通過微觀組織觀察以及夾雜物形狀與成分的分析，研究了稀土元素鈰對204Cu不銹鋼組織與夾雜物的影響；通過周期浸潤實(shí)驗(yàn)、電化學(xué)實(shí)驗(yàn)以及晶間腐蝕實(shí)驗(yàn)等方法研究稀土Ce對204Cu不銹鋼耐腐蝕性能的影響。通過常溫拉伸、沖擊實(shí)驗(yàn)研究了稀土Ce對204Cu不銹鋼力學(xué)性能的影響。 實(shí)驗(yàn)結(jié)果表明：稀土Ce加入到鋼中以后可以使晶粒細(xì)化，且晶粒細(xì)化的程度隨著鋼中稀土Ce含量的提高而逐漸增大。稀土Ce加入到204Cu不銹鋼中以后，對鋼中的夾雜物起到了變質(zhì)作用，改變了夾雜物的形態(tài)及成分。但是當(dāng)鋼中稀土Ce含量超過特定的范圍時，會產(chǎn)生尺寸較大的稀土復(fù)合夾雜物，使204Cu不銹鋼的耐腐蝕性能及力學(xué)性能出現(xiàn)下降。隨著鋼中稀土Ce含量的提高，逐步改善了204Cu不銹鋼的耐腐蝕性能，但是當(dāng)鋼中稀土Ce含量超過0.029%時，實(shí)驗(yàn)鋼的耐腐蝕性能出現(xiàn)了一定程度的降低。添加適量稀土Ce能夠顯著的提高204Cu不銹鋼的力學(xué)性能，當(dāng)鋼中稀土Ce含量為0.029%時，204Cu不銹鋼能夠得到最好的力學(xué)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.
【學(xué)位授予單位】：內(nèi)蒙古科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG142.71

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