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  本文關(guān)鍵詞：316不銹鋼表面等離子滲B、Mo-B共滲及其摩擦磨損性能的研究　出處：《太原理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 316奧氏體不銹鋼 等離子滲金屬技術(shù) 滲硼 鉬硼共滲 摩擦磨損

【摘要】：AISI316奧氏體不銹鋼作為重要的工程材料具有良好的綜合性能。例如，優(yōu)美的外觀、優(yōu)異的耐腐蝕性能、良好的塑性和韌性等，因此在海洋、化工、食品、航空、化工、醫(yī)療、汽車等領(lǐng)域具有廣泛的應(yīng)用和發(fā)展前景。然而AISI316奧氏體不銹鋼存在硬度比較低、耐磨性比較差的缺陷，特別是極易產(chǎn)生粘著磨損，從而阻礙了奧氏體不銹鋼的應(yīng)用。表面合金化技術(shù)成為解決這一問題的首選方法。雙輝等離子表面合金化技術(shù)憑借簡單、滲入效率高、膜基結(jié)合強(qiáng)度高的優(yōu)點，，成為表面改性的熱點。 前期實驗研究結(jié)果表明，通過在奧氏體不銹鋼表面形成硬質(zhì)改性層可以提高其摩擦學(xué)性能。在不銹鋼表面改性方法中，滲硼層憑借其較高的硬度，較高的耐磨性，尤其是良好的耐粘著磨損和磨粒磨損性能受到研究人員的廣泛關(guān)注。本文通過采用雙層輝光等離子表面合金化技術(shù)對316奧氏體不銹鋼進(jìn)行滲B和Mo-B共滲處理，制備表面含硼、鉬硼改性層，分別對滲層的組織結(jié)構(gòu)、成分分布、相結(jié)構(gòu)和顯微硬度等進(jìn)行分析，并重點探討研究干摩擦條件下不同載荷和配副對滲硼及鉬硼改性層摩擦磨損性能的影響及磨損機(jī)理。得出如下結(jié)論： (1)316奧氏體不銹鋼在不同工藝下雙輝等離子表面滲B及Mo-B共滲處理后，在試樣表面均能獲得一定厚度、組織均勻的改性層。改性層的厚度分別約為8μm和23μm；兩種改性層中B元素的含量在表面最高，由表及里在一定深度范圍內(nèi)呈梯度下降趨勢；經(jīng)滲B處理后改性層主要由FeB、Fe2B及Ni3B、CrB和γ組成，而Mo-B共滲處理后同時還形成了FeMo2B2和Mo2B相；滲B及Mo-B共滲兩種改性層的表面硬度分別是基材的4倍和4.5倍。劃痕測試表明，兩種改性層與基材具有良好的結(jié)合性能。 (2)在干摩擦條件下，以GCr15鋼球為摩擦配副，在1N、2N、5N三種載荷下，兩種改性層的摩擦系數(shù)均小于基體，比磨損率也遠(yuǎn)小于基體，其減摩性和耐磨性能在一定程度上得到提高。載荷為1N、2N時，滲B處理試樣的耐磨作用更為顯著明顯。5N載荷下，Mo-B共滲處理后試樣耐磨性更好。 (3)以Al2O3陶瓷球為摩擦配副，經(jīng)Mo-B共滲處理試樣的平均摩擦系數(shù)均大于未處理的不銹鋼基體，Mo-B共滲改性處理對基材沒有減摩作用。但2N、5N載荷下的摩擦學(xué)性能均得到改善。10N載荷下，膜層被磨穿，耐磨性較差。 (4)316奧氏體不銹鋼基體與GCr15及Al2O3對磨時的主要磨損機(jī)制是粘著磨損和磨粒磨損，而經(jīng)滲硼、Mo-B共滲處理后試樣主要是微磨粒磨損為主，含有少量的粘著磨損。
[Abstract]:AISI316 austenitic stainless steel as an important engineering material with good comprehensive properties. For example, beautiful appearance, excellent corrosion resistance, good plasticity and toughness, therefore in marine, chemical, food, aerospace, chemical, medical, and has wide application and development prospect of automotive and other fields. However, existing AISI316 austenitic stainless steel low hardness, wear resistance of the defects are relatively poor, especially prone to adhesive wear, which hinders the application of austenitic stainless steel. The surface alloying technology has become the preferred method to solve this problem. The double glow plasma surface alloying technology with simple, into high efficiency, combined with the advantages of high strength of the film substrate, a surface the modified hot spots.
The experimental results show that the formation of hard modified layer can improve the tribological properties of austenitic stainless steel in the stainless steel surface. The surface modification methods, boronizing layer because of its high hardness, high wear resistance, especially resistance to adhesive wear and abrasive wear properties have attracted much attention by good. Of the 316 austenitic stainless steel B and Mo-B infiltration seepage treatment by double glow plasma surface alloying technique, surface preparation of boron, molybdenum and boron modified layer, the distribution structure of the boride layer respectively, component analysis, phase structure and microhardness, and focuses on the study of dry friction under different load and a pair of molybdenum and boron modified on Boronizing layer friction and wear properties and wear mechanism. The main conclusions are as follows:
(1) 316 austenitic stainless steel under different process of double glow plasma surface infiltration of B and Mo-B infiltration treatment, at the surface of the sample can obtain a certain thickness, uniform microstructure of modified layer. The thickness of the modified layer were approximately 8 m and 23 m; the content of two kinds of modified B element layer on the surface of the high gradient, from the outside to the inside to decline in a certain depth range; the B surface modified layer is mainly composed of FeB, Fe2B and Ni3B, CrB and Mo-B gamma, seepage treatment and formation of FeMo2B2 and Mo2B; B and Mo-B infiltration permeability of two kinds of modified layer the surface hardness of the substrate is respectively 4 times and 4.5 times. Scratch test showed that two kinds of modified layer and the substrate with good performance.
(2) under the condition of dry friction, with GCr15 steel as friction pair, in 1N, 2N, 5N three kinds of loads, two kinds of friction coefficient of the modified layer are smaller than those of the matrix, the specific wear rate is far less than the substrate, the friction and wear properties were improved to a certain extent. Load 1N, 2N, B surface wear-resistant specimen is more significant.5N loads, Mo-B infiltration treated better wear resistance.
(3) to Al2O3 ceramic ball friction pair, the average friction coefficient of Mo-B carbonitriding samples were higher than the untreated stainless steel substrate, Mo-B alloying modification without friction reducing effect on the tribological properties of 2N substrate. But, under the loading of 5N were improved under.10N loading, the film was worn out. Poor wear resistance.
(4) the main wear mechanism of 316 austenitic stainless steel matrix and GCr15 and Al2O3 is abrasive wear and abrasive wear. However, after boronizing and Mo-B CO treatment, the main abrasive wear is mainly abrasive wear and a small amount of adhesive wear.

【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG174.4

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