【摘要】：在連鑄連軋過程中,結(jié)晶器是一個(gè)稱為“心臟”的重要部件。提高結(jié)晶器的使用壽命就可以節(jié)約連鑄連軋的成本。本文先采用單一變量法,研究了工藝參數(shù)對(duì)Ni-Co合金鍍層硬度的影響規(guī)律,優(yōu)化確定了電沉積Ni-Co合金鍍層的最佳工藝條件,并在鉻-鋯-銅上制備出了硬度高、結(jié)合性能良好的Ni-36.97%Co合金鍍層。分析比較退火溫度對(duì)Ni-36.97%Co合金鍍層顯微硬度及結(jié)構(gòu)的影響規(guī)律,發(fā)現(xiàn):隨退火溫度的升高,合金鍍層的硬度呈現(xiàn)先提高后降低,300℃時(shí)最高。退火后鍍層呈現(xiàn)較強(qiáng)的(111)織構(gòu);采用XRD對(duì)退火鍍層進(jìn)行物相分析,結(jié)果表明鍍層中產(chǎn)生了CoO硬質(zhì)相。之后向Ni-36.97%Co合金鍍層的鍍液加入Fe元素來研究工藝參數(shù)、Fe含量、退火溫度對(duì)Ni-Co-Fe合金鍍層的影響,得出最佳的工藝參數(shù)。研究發(fā)現(xiàn),Ni-Co-Fe合金鍍層的顯微硬度隨熱處理溫度升高先提高后降低,350℃時(shí)達(dá)到最高值,存在明顯的退火強(qiáng)化現(xiàn)象。鍍層晶粒尺寸在350℃之前緩慢增加,隨后急劇增大,且達(dá)到微米級(jí)別。衍射峰(111)和(200)隨熱處理溫度的升高不斷銳化,且(111)晶面織構(gòu)擇優(yōu)取向程度越大。采用XRD對(duì)Ni-Co-Fe合金鍍層進(jìn)行物相分析,結(jié)果表明,熱處理后鍍層有析出物產(chǎn)生且衍射圖譜表現(xiàn)出來的主要聚集在(111)與(200)衍射峰間,熱處理后Ni-Co-Fe合金鍍層的強(qiáng)化機(jī)理是由于硬質(zhì)相的析出。鍍態(tài)的Ni-Co-Fe合金鍍層的強(qiáng)化機(jī)理是由于鍍層中存在硬質(zhì)相FeNi3、Co3Fe而使硬度增大。研究發(fā)現(xiàn)電沉積時(shí)間并沒有改變Ni-Co-Fe合金鍍層(111)晶面的擇優(yōu)取向,但隨電沉積時(shí)間的增長(zhǎng),晶粒尺寸有所變小。
[Abstract]:During continuous casting and rolling, the crystallizer is an important component called the heart. Increasing the service life of the mould can save the cost of continuous casting and rolling. In this paper, the influence of process parameters on the hardness of Ni-Co alloy coating was studied by single variable method. The optimum process conditions for electrodeposition of Ni-Co alloy coating were optimized, and high hardness was prepared on Cr-Zr-Cu coating. Ni-36.97%Co alloy coating with good properties. The effect of annealing temperature on the microhardness and structure of Ni-36.97%Co alloy coating is analyzed and compared. It is found that the hardness of Ni-36.97%Co alloy coating increases first and then decreases at 300 鈩，

本文編號(hào)：2189671