本文選題：等離子快速成形 + 高溫合金基復(fù)合材料�。� 參考：《北京交通大學(xué)》2017年碩士論文

【摘要】：等離子快速成形技術(shù)可以直接成形形狀復(fù)雜的金屬原型或零件,可用于金屬或梯度材料的快速成形與零部件的表面修復(fù),是低成本直接快速成形制造金屬結(jié)構(gòu)件的有效途徑。Inconel 718因其在650 ℃以內(nèi)的屈服強(qiáng)度居變形高溫合金的首位,且具有良好的抗疲勞、抗氧化、耐腐蝕和長(zhǎng)期組織穩(wěn)定性而得到廣泛的應(yīng)用。TiC因其熔點(diǎn)高、彈性模量高、硬度高、耐磨性好與高溫穩(wěn)定性好等優(yōu)點(diǎn)而常被用作耐磨復(fù)合材料的增強(qiáng)相。本文分別以純Inconel 718粉末與Inconel 718-23.5Ti-14.5鎳包石墨(wt.%)、Inconel 718-29.5Ti-20.5 鎳包石墨(wt.%)和 Inconel 718-37.5Ti-26.5 鎳包石墨(wt.%)三種混合粉末為原料,利用等離子熔化沉積快速成形技術(shù)制備了 TiC為高溫耐磨增強(qiáng)相、以主要組成相為γγ"-Ni_3Nb和固溶了大量合金元素的過(guò)飽和鎳基固溶體的Inconel 718鎳基高溫合金為基體的高溫耐磨復(fù)合材料。利用XRD、OM、SEM、EDS等手段分析了快速成形Inconel 718試樣與復(fù)合材料的顯微結(jié)構(gòu)與相組成。結(jié)果表明:等離子快速成形Inconel 718試樣組成相為y"-Ni_3Nb和γ-(Ni,Fe)固溶體;三種復(fù)合材料的組成相為TiC、γ"-Ni_3Nb和γ-(Ni,Fe)固溶體。復(fù)合材料組織細(xì)小且致密,γ"-Ni_3Nb依附于TiC初生相析出,并逐漸包覆初生TiC相。熱處理制度對(duì)Inconel 718試樣與復(fù)合材料組織影響有所不同,Inconel 718試樣經(jīng)固溶+時(shí)效處理促進(jìn)了其γ"-Ni_3Nb相的析出,直接時(shí)效處理則不然,而兩種熱處理工藝對(duì)復(fù)合材料中γ"-Ni_3Nb相影響各不相同,但均導(dǎo)致復(fù)合材料發(fā)生組織粗化與析出相聚集連續(xù)的現(xiàn)象。利用顯微硬度儀測(cè)試了復(fù)合材料的顯微硬度,結(jié)果表明復(fù)合材料硬度隨TiC含量的增加而上升。利用銷-盤式常溫磨損試驗(yàn)機(jī)測(cè)試了復(fù)合材料的常溫干滑動(dòng)摩擦磨損性能,結(jié)果表明在常溫干滑動(dòng)磨損條件下,Inconel 718試樣常溫耐磨性能較差,固溶+時(shí)效處理使其常溫耐磨性能有所提高,而復(fù)合材料由TiC起抗磨骨干作用,常溫耐磨性能隨TiC含量的增加而上升,兩種熱處理工藝因?qū)?fù)合材料組織的影響均不利于了復(fù)合材料的常溫耐磨性能。利用球-盤式高溫磨損試驗(yàn)機(jī)測(cè)試了復(fù)合材料的高溫干滑動(dòng)摩擦磨損性能,結(jié)果表明在高溫干滑動(dòng)磨損條件下,Inconel 718試樣磨損表面由于氧化磨損與磨粒磨損的共同作用,氧化膜遭接觸應(yīng)力破壞導(dǎo)致材料內(nèi)部進(jìn)一步發(fā)生氧化,并出現(xiàn)氧化膜剝落與轉(zhuǎn)移的現(xiàn)象,而復(fù)合材料由于TiC耐磨增強(qiáng)相的引入,有效抵抗了接觸應(yīng)力所導(dǎo)致的磨粒磨損狀況,并得以抑制材料內(nèi)部的進(jìn)一步氧化,使復(fù)合材料相較于Inconel 718高溫合金具有較低的摩擦系數(shù)和磨損率,而過(guò)高的TiC含量不利于復(fù)合材料的抗載荷敏感性,因而適當(dāng)?shù)腡iC耐磨增強(qiáng)相與Inconel 718高溫合金基體含量可使復(fù)合材料表現(xiàn)出良好的高溫耐磨性能,其中以Inconel 718-29.5Ti-20.5鎳包石墨(wt.%)成分粉末為原料制備的復(fù)合材料具有最好的高溫耐磨性能,應(yīng)可用于高接觸應(yīng)力條件下的高溫強(qiáng)磨損工況。
[Abstract]:Rapid plasma forming technology can form complex metal prototypes or parts can be used for direct forming, surface repair and rapid prototyping parts or metal gradient materials, is the low cost of direct rapid prototyping.Inconel effective way of manufacturing metal structures because of its 718 at 650 DEG C to yield strength in the first Ju superalloy, and has good anti fatigue, anti-oxidation, corrosion resistance and long-term stability of the organization and is widely used in.TiC because of its high melting point, high elastic modulus, high hardness, good wear resistance and high temperature has the advantages of good stability and is often used as reinforced wear resistant composite material. This paper YISHION Inconel 718 powder and nickel coated graphite (Inconel 718-23.5Ti-14.5 wt.%, Inconel, 718-29.5Ti-20.5) of nickel coated graphite (wt.%) and Inconel 718-37.5Ti-26.5 (wt.%) three nickel coated graphite mixed powder as raw materials, the use of plasma melting TiC prepared for the high temperature wear resistance enhanced deposition rapid prototyping system, which mainly consists of gamma gamma -Ni_3Nb and solid solubility of alloy elements of the supersaturated solid solution of nickel based Inconel 718 nickel based high temperature alloy for high temperature wear-resistant composite matrix. By using XRD, OM, SEM, EDS and other means of analysis the microstructure and phase composition of rapid prototyping Inconel 718 sample and composite materials. The results showed that the plasma rapid prototyping Inconel 718 samples are composed of Y -Ni_3Nb and gamma (Ni, Fe) solid solution; three kinds of composite materials are TiC, -Ni_3Nb and gamma gamma (Ni, Fe) solid solution. The structure of the composites is fine and dense, gamma -Ni_3Nb attached to the TiC primary phase precipitation, and gradually covering the primary TiC phase. The influence of heat treatment on Inconel composite tissue specimen and 718 different Inconel 718 after solution and aging treatment to promote the "gamma -Ni_3Nb precipitates, straight After aging treatment is not, and two kinds of heat treatment process on the composite gamma -Ni_3Nb phase effects vary, but are due to coarse structure and precipitation composite continuous gathered phenomenon. The microhardness of the composite was tested by microhardness tester, the results show that the increase of hardness of the composites with the content of TiC increased. By using the pin on disk wear tester at room temperature of the composite material at room temperature dry sliding friction and wear properties, the results show that in the condition of room temperature dry sliding wear, wear resistance of Inconel 718 samples at room temperature is poor, solution and aging treatment to the normal wear resistance is improved, and the composite material by TiC wear a key role to increase the wear resistance at room temperature, with TiC content increased, two kinds of heat treatment for the effect on the composite tissue are not conducive to the normal wear properties of the composites using ball - disc high. The high temperature test of composite dry sliding friction and wear properties of warm wear tester. The results show that in the condition of high temperature dry sliding wear, wear Inconel 718 surface due to oxidation wear and abrasive wear of the interaction, the contact stress damage caused by the oxide film material further oxidized, and the emergence of exfoliation of oxide films and transfer phenomenon. The composite materials with TiC wear resistant reinforcement is introduced, the effective resistance to abrasion of contact stress, and can inhibit the further oxidation of the composite materials, compared to the Inconel 718 high temperature alloy has low friction coefficient and wear rate, and the high content of TiC is not conducive to the anti load sensitivity of composite the material, thus TiC wear appropriate reinforcement phase and matrix content Inconel 718 superalloy can make the composites exhibit excellent wear resistance to high temperature, which The composites made of Inconel 718-29.5Ti-20.5 nickel coated graphite (wt.%) powder have the best high-temperature wear resistance. They should be applied to high temperature and strong wear conditions under high contact stress conditions.

【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB333

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