發(fā)布時間：2018-03-16 20:36

  本文選題：鋁液　切入點(diǎn)：腐蝕-磨損　出處：《華南理工大學(xué)》2015年博士論文　論文類型：學(xué)位論文

【摘要】：在熔鋁鑄造、熱浸鍍鋁及鋁合金復(fù)合材料制造等行業(yè),鋁液腐蝕-磨損通常會造成坩堝和鑄模等重要零部件失效,因此,研制出優(yōu)異耐鋁液腐蝕-磨損性能的鐵合金新材料具有重要的意義。本文以在鋼基體中生成Fe2B相為設(shè)計目標(biāo),采取以B元素為主,以Cr、Mo等元素為輔的合金化方式,在中頻感應(yīng)電爐中制備出新型Fe-Cr-B鑄鋼,并研究了Cr、B含量對Fe-Cr-B鑄鋼鋁液腐蝕及腐蝕-磨損性能的影響。在此基礎(chǔ)上,對多孔ZrO2陶瓷骨架表面鍍鎳,并利用砂型鑄造制備出三維網(wǎng)絡(luò)結(jié)構(gòu)ZrO2/Fe-Cr-B鑄鋼復(fù)合材料,同時研究了其耐鋁液腐蝕-磨損性能。主要結(jié)論如下:(1)Fe-Cr-B鑄鋼具有優(yōu)異的耐鋁液腐蝕性能,其中Fe-12.3 wt.%Cr-5.88wt.%Mn-3.6 wt.%B-1.89 wt.%Mo(M6)的耐鋁液腐蝕性能比H13提高了5倍。M2B(M=Fe,Cr,Mo)型硼化物對提高Fe-Cr-B鑄鋼的耐鋁液腐蝕性能起到重要作用:在鋁液腐蝕過程中,M2B型硼化物比Fe基體具有更低的的鋁液腐蝕速率,它們明顯提高了鑄鋼的耐鋁液腐蝕性能;其中富Cr的Fe2B型硼化物,與鋁液反應(yīng)生成兩相相間的層片結(jié)構(gòu);而富Mo的Fe2B型硼化物則發(fā)生斷裂;二者失效后都鑲嵌在Cr合金化的Fe-Al金屬間化合物層中,起到“樹根”效應(yīng),能抑制金屬間化合物層的剝落。(2)Fe-Cr-B鑄鋼具有優(yōu)異的耐鋁液腐蝕-磨損性能,其中M6的耐鋁液腐蝕-磨損性能比H13提高了3倍。初生富Cr的Fe2B型硼化物對提高Fe-Cr-B鑄鋼的鋁液腐蝕-磨損性能起到重要作用:在鋁液腐蝕-磨損過程中,初生富Cr的Fe2B型硼化物表現(xiàn)出比基體更慢的鋁液腐蝕-磨損速率,進(jìn)而凸出基體表面并承受主要的載荷,導(dǎo)致摩擦副之間的鋁液膜非常薄,從而使鋁液腐蝕不充分,引起初生富Cr的Fe2B型硼化物中的Fe元素發(fā)生優(yōu)先溶解并形成Cr含量很高的金屬間化合物,其主要組成元素為Cr、Al和B,但這種金屬間化合物最終會發(fā)生斷裂而失效。(3)采用砂型鑄造能夠制備出界面結(jié)合良好的三維網(wǎng)絡(luò)結(jié)構(gòu)ZrO2/Fe-Cr-B鑄鋼復(fù)合材料,這種復(fù)合材料的耐鋁液腐蝕-磨損性能比H13提高了近10倍;ZrO2對提高復(fù)合材料的耐鋁液腐蝕-磨損性能起到重要作用:在鋁液腐蝕-磨損過程中,ZrO2陶瓷承受主要的載荷,金屬基體則主要經(jīng)受動態(tài)鋁液的腐蝕。(4)對于Fe-Cr-B鑄鋼及H13而言,鋁液腐蝕-磨損引起的失重要遠(yuǎn)遠(yuǎn)大于同等實(shí)驗參數(shù)下單一的鋁液腐蝕及干摩擦磨損引起的失重之和,它們在鋁液腐蝕-磨損過程中的交互作用率在0.8以上,表明鋁液腐蝕與磨損之間的交互作用是這兩種材料在鋁液腐蝕-磨損環(huán)境中失效的最主要原因。
[Abstract]:In industries such as molten aluminum casting, hot-dip aluminizing and aluminum alloy composite material manufacturing, corrosion wear of molten aluminum usually results in the failure of important parts such as crucible and mould. It is of great significance to develop a new ferroalloy material with excellent corrosion resistance and wear resistance of molten aluminum. In this paper, the formation of Fe2B phase in steel substrate is taken as the design goal, and the alloying method is adopted, which is based on element B and supplemented by elements such as Cr-Mo and so on. A new type of Fe-Cr-B cast steel was prepared in an intermediate frequency induction furnace. The effect of CrB content on the corrosion and corrosion-wear properties of Fe-Cr-B cast steel was studied. On this basis, nickel plating on the porous ZrO2 ceramic framework was carried out. Three-dimensional network ZrO2/Fe-Cr-B cast steel composites were prepared by sand mold casting, and the corrosion and wear resistance of the composites were studied. The main conclusions are as follows: 1) Fe-Cr-B cast steel has excellent corrosion resistance to molten aluminum. The corrosion resistance of Fe-12.3 wt.%Cr-5.88wt.%Mn-3.6 wt.%B-1.89 wt.MoM6) is 5 times higher than that of H13. The boride type plays an important role in improving the corrosion resistance of Fe-Cr-B cast steel. In the process of molten aluminum corrosion, M2B type boride has a lower corrosion rate than Fe matrix. They obviously improve the corrosion resistance of cast steel, in which Cr rich Fe2B boride reacts with molten aluminum to form a lamellar structure of two phases, while Mo rich Fe2B boride breaks. Both of them are embedded in Cr alloyed Fe-Al intermetallic compound layer after failure, which plays a "tree root" effect and can inhibit the spalling of intermetallic compound layer. Fe-Cr-B cast steel has excellent corrosion and wear resistance to aluminum liquid. The corrosion and wear resistance of M6 is three times higher than that of H13. The primary Cr rich Fe2B boride plays an important role in improving the corrosion and wear properties of Fe-Cr-B cast steel. The primary Cr rich Fe2B boride exhibits a slower corrosion wear rate than the matrix, and then protrudes the substrate surface and bears the main load, which leads to the thin aluminum film between the friction pairs, which makes the molten aluminum corrosion insufficient. The Fe element in the primary Cr rich Fe2B boride dissolves preferentially and forms the intermetallic compound with high Cr content. The main elements are Cr-Al and B, but this intermetallic compound will eventually fracture and fail. 3) Sand mold casting can be used to fabricate 3D network ZrO2/Fe-Cr-B cast steel composites with good interfacial bonding. The corrosion and wear resistance of the composite is 10 times higher than that of H13, which plays an important role in improving the corrosion and wear resistance of the composite: in the process of corrosion and wear of molten aluminum, ZrO2 ceramics bear the main load. For Fe-Cr-B cast steel and H13, the weight loss caused by corrosion wear of molten aluminum is much larger than that caused by corrosion and dry friction wear under the same experimental parameters. The interaction rate of these two materials in the process of corrosion and wear of molten aluminum is more than 0.8, which indicates that the interaction between corrosion and wear of molten aluminum is the main reason for the failure of these two kinds of materials in the corrosion wear environment of molten aluminum.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TG142;TB333

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 蔣淑英;李世春;張磊;;Al-Ti液固界面的組織結(jié)構(gòu)演變(英文)[J];Transactions of Nonferrous Metals Society of China;2013年12期

相關(guān)碩士學(xué)位論文 前1條

1 習(xí)呂鵬;提高Fe-Si金屬間化合物內(nèi)加熱套管抗熱震性的成型工藝研究[D];長安大學(xué);2009年

，

本文編號：1621578