中錳奧氏體鋼礦井水工況的摩擦及腐蝕行為研究
發(fā)布時(shí)間：2018-09-09 13:35
【摘要】：腐蝕是造成煤礦綜采設(shè)備失效的主要原因之一。由于煤炭開采環(huán)境陰暗、潮濕,井下空氣相對濕度常年在90%以上,在交變應(yīng)力和腐蝕介質(zhì)的共同作用下,金屬的實(shí)際腐蝕過程變得十分復(fù)雜,影響腐蝕的因素較多。本文選用中錳奧氏體與馬氏體耐磨鋼為對象,研究了礦井水工況的均勻腐蝕和電化學(xué)腐蝕行為,并對滑動和沖擊摩擦腐蝕性能進(jìn)行了探討,論文取得的主要結(jié)論如下:中性水工況下兩種鋼的腐蝕速率較低,整個(gè)均勻腐蝕過程中的腐蝕產(chǎn)物主要為Fe_2O_3、FeSO_4和Fe(HCO_3)_3。對比馬氏體鋼,奧氏體中錳鋼更適用于堿性礦井水的工況環(huán)境。奧氏體中錳鋼和馬氏體耐磨鋼均勻腐蝕腐蝕特征由早期的非均勻腐蝕向全面的均勻腐蝕逐漸過渡。非均勻腐蝕特征主要表現(xiàn)為局部(晶界和晶內(nèi))的點(diǎn)蝕和晶內(nèi)組織腐蝕,均勻腐蝕特征則主要表現(xiàn)為較深的點(diǎn)蝕和坑蝕、晶界和晶內(nèi)的深度的腐蝕溝槽及大量的腐蝕產(chǎn)物等。酸性水工況下兩種耐磨鋼的開路電位最負(fù),工作電極較參比電極比起來更容易失去電子,腐蝕更易發(fā)生。堿性水工況奧氏體中錳鋼的開路電位高于馬氏體鋼,腐蝕趨勢低于馬氏體鋼。三種模擬工況下奧氏體鋼都有明顯鈍化區(qū),酸性工況鈍化區(qū)較窄,中性和堿性工況鈍化區(qū)較寬。酸性和堿性工況腐蝕電位負(fù)移,腐蝕電流密度增大,腐蝕更易發(fā)生。兩種耐磨鋼的電化學(xué)等效電路圖可用模擬工況溶液電阻(Rs)和電阻-電容并聯(lián)(RpCp)的電路串聯(lián)擬合,且電極中都只發(fā)生了一個(gè)電極反應(yīng)。奧氏體鋼的阻抗模值在酸性工況下減小較多,容抗弧較小,表面腐蝕較為嚴(yán)重。馬氏體鋼在酸性工況下的容抗弧最小,腐蝕也最為嚴(yán)重。三種礦井水條件下,奧氏體中錳鋼的沖擊摩擦腐蝕和滑動摩擦腐蝕磨損率均低于馬氏體耐磨鋼,耐腐蝕磨損性能好于馬氏體耐磨鋼。三種礦井水的腐蝕磨損均處于以摩擦為主導(dǎo)的摩擦腐蝕體系,由于磨損實(shí)驗(yàn)時(shí)間較短,摩擦對腐蝕的加速作用不明顯。基體奧氏體鋼的腐蝕磨損層的硬度得到明顯提高,三種礦井水工況下奧氏體鋼的亞表層50μm處的顯微硬度達(dá)到510 HV,平均提高了2.1倍,明顯高于馬氏體耐磨鋼的硬度,磨損硬化層深度接近500μm。三種礦井水條件下,兩種耐磨鋼有著相同的磨損機(jī)理,都表現(xiàn)為犁溝磨損和疲勞剝落磨損。對比三種礦井水之間的沖擊摩擦腐蝕磨損率,酸性礦井水略高于中性和堿性工況。沖擊腐蝕磨損層奧氏體鋼的硬度得到明顯提高,三種礦井水工況下奧氏體鋼的亞表層50μm處的顯微硬度達(dá)到520 HV,平均提高了2.2倍,明顯高于馬氏體耐磨鋼的硬度,奧氏體中錳鋼表現(xiàn)出良好的沖擊加工硬化性能。三種礦井水工況的沖擊腐蝕磨損層均出現(xiàn)了形變誘發(fā)馬氏體相變,為板條位錯(cuò)型馬氏體組織。中錳鋼強(qiáng)化機(jī)理分析表明,形變誘發(fā)馬氏體相變強(qiáng)化、位錯(cuò)和孿晶強(qiáng)化是其加工硬化主要機(jī)制,屬于復(fù)合強(qiáng)化機(jī)理。三種礦井水工況的沖擊腐蝕摩擦均屬于以摩擦為主導(dǎo)的摩擦腐蝕體系,鑿削磨損和犁溝切削磨損是兩種鋼沖擊腐蝕磨損的主要磨損機(jī)制。
[Abstract]:Corrosion is one of the main reasons for failure of fully mechanized mining equipment in coal mines.Because of the dark and humid coal mining environment,the relative humidity of the underground air is above 90% all the year round.Under the combined action of alternating stress and corrosive medium,the actual corrosion process of metals becomes very complicated and there are many factors affecting corrosion.Medium manganese austenite and horse are selected in this paper. The uniform corrosion and electrochemical corrosion behavior of the wear-resistant steel in mine water were studied, and the sliding and impact friction corrosion properties were discussed. The main conclusions of the paper are as follows: the corrosion rate of the two steels in neutral water is low, and the corrosion products in the whole uniform corrosion process are mainly Fe_2O_3, FeSO_4 and Fe (H). CO_3)_3. Compared with martensitic steels, austenitic medium manganese steels are more suitable for working conditions of alkaline mine water. The uniform corrosion characteristics of Austenitic Medium Manganese Steels and martensitic wear-resistant steels gradually transit from early inhomogeneous corrosion to full-scale homogeneous corrosion. Corrosion and uniform corrosion are characterized by deep pitting and pitting corrosion, deep corrosion grooves at grain boundaries and in grains, and a large number of corrosion products. The open-circuit potential of steel is higher than that of martensitic steel, and the corrosion trend is lower than that of martensitic steel. The passivation zone of austenitic steel is narrow in acidic condition, wider in neutral and alkaline condition. The corrosion potential shifts negatively in acidic and alkaline condition, the corrosion current density increases, and the corrosion is easy to occur. The equivalent circuit diagram can be fitted in series with the solution resistance (Rs) and the resistance-capacitance parallel connection (RpCp) under the simulated working condition, and only one electrode reaction takes place in the electrode. The wear rate of impact friction corrosion and sliding friction corrosion corrosion of Austenitic Medium Manganese Steel is lower than that of martensitic wear-resistant steel under three kinds of mine water conditions, and its corrosion resistance is better than that of martensitic wear-resistant steel. The hardness of the corrosive wear layer of the base austenitic steel has been obviously improved. The microhardness of the 50 micron sub-surface layer of the austenitic steel under three mine water conditions is 510 HV, which is 2.1 times higher than that of the martensitic wear-resistant steel. The depth of the wear hardening layer is close to 500 micron. The wear mechanisms of the two kinds of wear-resistant steels are the same, both of which are plough wear and fatigue spalling wear. Compared with the impact friction corrosion corrosion wear rate of the three kinds of mine water, the acid mine water is slightly higher than the neutral and alkaline conditions. The hardness of the impact corrosion wear layer of the austenitic steel is obviously improved, and the austenitic steel under the three kinds of mine water conditions. The microhardness at 50 micron of the subsurface layer is 520 HV, which is 2.2 times higher than that of the martensitic wear resistant steel. The Austenitic Medium Manganese Steel exhibits good impact working hardening property. Deformation-induced martensitic transformation occurs in the impact corrosive wear layer of the three kinds of mine water, and it is lath dislocation martensite structure. The analysis of strengthening mechanism shows that deformation-induced martensitic transformation strengthening, dislocation and twin strengthening are the main mechanisms of work hardening and belong to compound strengthening mechanism. Wear mechanism.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD407
本文編號：2232533
[Abstract]:Corrosion is one of the main reasons for failure of fully mechanized mining equipment in coal mines.Because of the dark and humid coal mining environment,the relative humidity of the underground air is above 90% all the year round.Under the combined action of alternating stress and corrosive medium,the actual corrosion process of metals becomes very complicated and there are many factors affecting corrosion.Medium manganese austenite and horse are selected in this paper. The uniform corrosion and electrochemical corrosion behavior of the wear-resistant steel in mine water were studied, and the sliding and impact friction corrosion properties were discussed. The main conclusions of the paper are as follows: the corrosion rate of the two steels in neutral water is low, and the corrosion products in the whole uniform corrosion process are mainly Fe_2O_3, FeSO_4 and Fe (H). CO_3)_3. Compared with martensitic steels, austenitic medium manganese steels are more suitable for working conditions of alkaline mine water. The uniform corrosion characteristics of Austenitic Medium Manganese Steels and martensitic wear-resistant steels gradually transit from early inhomogeneous corrosion to full-scale homogeneous corrosion. Corrosion and uniform corrosion are characterized by deep pitting and pitting corrosion, deep corrosion grooves at grain boundaries and in grains, and a large number of corrosion products. The open-circuit potential of steel is higher than that of martensitic steel, and the corrosion trend is lower than that of martensitic steel. The passivation zone of austenitic steel is narrow in acidic condition, wider in neutral and alkaline condition. The corrosion potential shifts negatively in acidic and alkaline condition, the corrosion current density increases, and the corrosion is easy to occur. The equivalent circuit diagram can be fitted in series with the solution resistance (Rs) and the resistance-capacitance parallel connection (RpCp) under the simulated working condition, and only one electrode reaction takes place in the electrode. The wear rate of impact friction corrosion and sliding friction corrosion corrosion of Austenitic Medium Manganese Steel is lower than that of martensitic wear-resistant steel under three kinds of mine water conditions, and its corrosion resistance is better than that of martensitic wear-resistant steel. The hardness of the corrosive wear layer of the base austenitic steel has been obviously improved. The microhardness of the 50 micron sub-surface layer of the austenitic steel under three mine water conditions is 510 HV, which is 2.1 times higher than that of the martensitic wear-resistant steel. The depth of the wear hardening layer is close to 500 micron. The wear mechanisms of the two kinds of wear-resistant steels are the same, both of which are plough wear and fatigue spalling wear. Compared with the impact friction corrosion corrosion wear rate of the three kinds of mine water, the acid mine water is slightly higher than the neutral and alkaline conditions. The hardness of the impact corrosion wear layer of the austenitic steel is obviously improved, and the austenitic steel under the three kinds of mine water conditions. The microhardness at 50 micron of the subsurface layer is 520 HV, which is 2.2 times higher than that of the martensitic wear resistant steel. The Austenitic Medium Manganese Steel exhibits good impact working hardening property. Deformation-induced martensitic transformation occurs in the impact corrosive wear layer of the three kinds of mine water, and it is lath dislocation martensite structure. The analysis of strengthening mechanism shows that deformation-induced martensitic transformation strengthening, dislocation and twin strengthening are the main mechanisms of work hardening and belong to compound strengthening mechanism. Wear mechanism.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD407
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