本文選題：等離子噴焊 + 合金元素　； 參考：《吉林大學(xué)》2016年碩士論文

【摘要】：在礦山開采、模具鑄造和機械加工等領(lǐng)域,許多零部件所處工作環(huán)境惡劣,表面磨損和腐蝕常常是零部件失效的主要原因。為了提高零部件在使用過程中的耐磨性和耐蝕性,延長零部件的使用壽命,研究人員采用了激光熔覆和等離子噴焊等表面強化技術(shù)。其中等離子噴焊技術(shù)因具有消耗材料少,生產(chǎn)效率高,成品制備容易等優(yōu)點,越來越多地受到業(yè)界重視。本文利用等離子噴焊技術(shù)在H13模具鋼基體表面制備噴焊層,噴焊材料以Ni60A為基本合金粉末,分別在其中添加合金元素Mo和Cu后研究了噴焊層的耐磨與耐蝕性能。并對添加合金元素Mo強化后的噴焊層進行固溶和時效處理,研究了熱處理工藝對噴焊層微觀組織與性能的影響。Ni60A合金粉末加入合金元素Mo之后,所制備的等離子噴焊層顯微組織得到細化,噴焊層中生成了Mo Si2、Mo2C、Mo3C2和Mo C等硬質(zhì)相,硬質(zhì)相彌散分布在噴焊層中。Mo3C2通過共析反應(yīng)轉(zhuǎn)變?yōu)镸o C和Mo2C,相互聚集形成橢圓形碳化物。固溶處理后,初生碳化物幾乎全部溶解在噴焊層中,但仍有一定量的Mo2C和Mo C等未發(fā)生溶解;熔合區(qū)的粗大晶粒帶消失,化學(xué)成分也更加均勻。磨料磨損試驗表明:隨著噴焊層中Mo含量的增加,噴焊層的耐磨性明顯提高,Mo的添加量達到8%時,與Ni60A噴焊層相比,耐磨性提高了約30%。但Mo的加入量過多反而會降低噴焊層的耐磨性。固溶處理后噴焊層的組織與成分更加均勻,殘余應(yīng)力大幅度減小,合金元素Mo強化的噴焊層經(jīng)固溶處理后的耐磨性能較未經(jīng)熱處理和時效處理的更好。電化學(xué)腐蝕試驗表明:添加合金元素Mo的噴焊層的點蝕電位大幅增加,8%Mo/Ni60A噴焊層的耐點蝕性能較好。1%Cu/Ni60A噴焊層的點蝕電位Eb與Ni60A噴焊層相比提高了80m V,噴焊層也具有良好的耐點蝕性能。同時添加合金元素Mo和Cu所制備的噴焊層耐點蝕性能優(yōu)于304不銹鋼,利用噴焊合金粉末10%Mo+1.4%Cu/Ni60A所制備的噴焊層的耐點蝕性能最好。在10%HCl和10%H2SO4溶液中,單獨添加合金元素Mo和Cu以及兩者同時添加均能使得噴焊層的腐蝕電位Ecorr增大,腐蝕電流Icorr減小,抗均勻腐蝕能力提高。固溶處理后的噴焊層在10%HCl溶液中的腐蝕電位Ecorr增加了69.6 m V,耐蝕性能得到了提高。
[Abstract]:In the fields of mining, mold casting and mechanical processing, many parts are in a bad working environment, surface wear and corrosion are often the main reasons for the failure of parts. In order to improve the wear resistance and corrosion resistance of the parts and prolong the service life of the parts, the surface strengthening techniques such as laser cladding and plasma spray welding were adopted. Plasma spray welding technology has attracted more and more attention because of its advantages of low consumption of materials, high production efficiency and easy preparation of finished products. In this paper, plasma spray welding technology was used to prepare spray welding layer on the substrate of H13 die steel. Ni60A was used as the basic alloy powder, and the wear resistance and corrosion resistance of the spray welding layer were studied after the addition of Mo and Cu respectively. The effect of heat treatment on the microstructure and properties of the spray-welding layer was studied. The effect of heat treatment on the microstructure and properties of the spray-welding coating was studied after adding the alloy element Mo to the alloy powder, and the effect of heat treatment on the microstructure and properties of the spray-welding layer was studied. The microstructure of the plasma spray welding layer was refined. The hard phases such as Mo Si 2N Mo 2C C 2 Mo 3C 2 and Mo C 3 C were formed in the spray welding layer. The hard phase dispersed in the spray welding layer and changed to Mo C and Mo 2C by eutectoid reaction, and formed an elliptical carbide. After solution treatment, the primary carbides were almost dissolved in the spray welding layer, but some amounts of Mo2C and MoC were not dissolved, and the coarse grain bands in the fusion zone disappeared, and the chemical composition was more uniform. The abrasive wear test shows that with the increase of Mo content in the spray welding layer, the wear resistance of the spray welding coating is obviously improved when the addition amount of Mo is up to 8%, and the wear resistance of the spray welding layer is increased by about 30% compared with the Ni60A spray welding layer. However, the wear resistance of the spray welding layer will be reduced by the addition of Mo. After solution treatment, the microstructure and composition of the spray welding layer are more uniform, and the residual stress is greatly reduced, and the wear resistance of the spray welding layer strengthened by Mo alloy is better than that without heat treatment and aging treatment. The electrochemical corrosion test showed that the pitting corrosion potential of spray welding coating with Mo addition increased significantly, and the pitting corrosion resistance of spray welding coating with Mo / Ni60A was better than that of Ni60A coating. The pitting corrosion potential of spray welding coating was 80 MV higher than that of Ni60A spray welding coating, and the spray welding coating also had better pitting corrosion resistance than Ni60A spray welding coating. Good pitting resistance. The pitting corrosion resistance of the spray-welding coating prepared by adding alloy elements Mo and Cu is better than that of 304 stainless steel, and the pitting corrosion resistance of the spray-welding coating made of 10Mo 1.4 Cu/ Ni60A alloy powder is the best. In the solution of 10HCl and 10H2SO4, the addition of Mo and Cu alone and both of them can increase the corrosion potential, decrease the corrosion current and improve the uniform corrosion resistance of the spray welding coating. After solution treatment, the corrosion potential of spray welding layer in HCl solution increased by 69.6 MV, and the corrosion resistance was improved.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TG174.4

【相似文獻】

相關(guān)期刊論文 前10條

1 詹祖保;吳子健;阮文軍;蘇芳;;等離子噴焊及應(yīng)用[J];材料保護;1991年04期

2 ;液壓傳動雙槍等離子噴焊及其應(yīng)用[J];礦山機械;1974年04期

3 武漢材料保護研究所犁鏵課題組;犁鏵等離子噴焊工藝與材料的研究[J];材料保護;1978年03期

4 金雪晶;;粉末等離子噴焊熱軋工具的試驗[J];鞍鋼技術(shù);1980年10期

5 黃勝輝;;小型等離子噴焊槍[J];新技術(shù)新工藝;1984年03期

6 佟樹善;丁彰雄;;等離子噴焊工藝對焊層沖淡率的影響[J];武漢水運工程學(xué)院學(xué)報;1985年02期

7 高安林;;等離子噴焊層沖擊韌性試驗[J];機械工程師;1985年03期

8 高安林;等離子噴焊層沖擊韌性試驗[J];化工時刊;1990年03期

9 范志虎;林湛;;微機控制等離子噴焊設(shè)備的研制[J];電焊機;1991年04期

10 楊永良;等離子噴焊技術(shù)的幾點體會[J];焊接;1995年04期

相關(guān)會議論文 前4條

1 尹瑜玲;詹祖保;吳子健;;大型柴油機閥桿與閥座的等離子噴焊工藝[A];第九次全國焊接會議論文集（第1冊）[C];1999年

2 李京龍;白鋼;李振民;;脈動等離子噴焊技術(shù)[A];第十次全國焊接會議論文集（第2冊）[C];2001年

3 盧順;陳健;詹捷;曹宇芳;孫智富;;模具表面等離子噴焊CoWC50合金強化研究[A];2007高技術(shù)新材料產(chǎn)業(yè)發(fā)展研討會暨《材料導(dǎo)報》編委會年會論文集[C];2007年

4 童向陽;;DF4內(nèi)燃機車柴油機氣門等離子噴焊[A];第十一次全國焊接會議論文集（第1冊）[C];2005年

相關(guān)博士學(xué)位論文 前1條

1 王懷志;鋁青銅減摩粉體涂層及摩擦磨損性能[D];蘭州理工大學(xué);2010年

相關(guān)碩士學(xué)位論文 前10條

1 顧鳳麟;SiC，，WC對鈷基合金等離子噴焊層組織和性能的影響[D];安徽工業(yè)大學(xué);2014年

2 陳豐君;離心壓縮機葉片變性層對再制造的影響及去除研究[D];合肥工業(yè)大學(xué);2015年

3 徐紅勇;等離子噴焊硬質(zhì)增強耐磨層組織與性能研究[D];吉林大學(xué);2016年

4 張野;Mo和Cu對Ni60A等離子噴焊層組織及性能的影響[D];吉林大學(xué);2016年

5 杜永鵬;自動等離子噴焊控制系統(tǒng)研究[D];蘭州理工大學(xué);2008年

6 黃詩銘;模具表面缺陷等離子噴焊修復(fù)研究[D];吉林大學(xué);2012年

7 馬保榮;銅合金粉末粒度對等離子噴焊層組織和性能的影響[D];蘭州理工大學(xué);2010年

8 蔣濤;氣門錐面等離子噴焊鈷基系列合金強化層的性能研究[D];廣東工業(yè)大學(xué);2006年

9 王書光;數(shù)字式等離子噴焊電源的研究與設(shè)計[D];山東科技大學(xué);2007年

10 張明華;基于VB自動等離子噴焊控制系統(tǒng)研究[D];蘭州理工大學(xué);2005年

本文編號：2041485