發(fā)布時間：2018-04-18 18:13

  本文選題：氣相沉積 + 激光淬火�。� 參考：《西南石油大學(xué)》2016年碩士論文

【摘要】：石油作為一種戰(zhàn)略物資在我國國民經(jīng)濟發(fā)展中具有舉足輕重的作用,但是我國的石油資源十分短缺。為了保障國家能源安全,石油勘探開發(fā)難度不斷增大,深井超深井、大斜度大位移井等復(fù)雜結(jié)構(gòu)井的鉆探數(shù)量成倍增長,鉆具失效事故時有發(fā)生,嚴(yán)重影響了鉆井安全和經(jīng)濟效益。本文在大量調(diào)研鉆具失效分析及預(yù)防相關(guān)文獻(xiàn)的基礎(chǔ)上,結(jié)合鉆井現(xiàn)場鉆具失效的情況,對井下工具中的4145h鋼進(jìn)行了系統(tǒng)的材料性能研究;針對井下工具受力條件復(fù)雜,長期服役在交變應(yīng)力、摩擦磨損、腐蝕環(huán)境等惡劣工況中,探索了三種表面改性處理技術(shù)對井下工具的材料性能的影響。本文進(jìn)行了以下幾個方面的研究:(1)通過大量調(diào)研三種表面改性處理技術(shù)相關(guān)文獻(xiàn),確定了 CVD氣相沉積處理、激光淬火處理及QPQ鹽浴復(fù)合熱處理三種表面改性處理技術(shù)的工藝參數(shù)。選用4145h鋼作為實驗材料,按照國標(biāo)HB5287-96《金屬材料軸向加載疲勞試驗方法》對標(biāo)準(zhǔn)材料進(jìn)行試樣的制取與加工。按照確定的三種處理工藝參數(shù)對原始試樣分別進(jìn)行表面改性處理。(2)對經(jīng)過三種表面處理技術(shù)后的4145h鋼進(jìn)行了常溫常壓下的耐疲勞性研究。對不同表面改性處理的試樣和原始試樣進(jìn)行旋轉(zhuǎn)彎曲疲勞試驗,在中短壽命區(qū)利用成組法進(jìn)行實驗數(shù)據(jù)的統(tǒng)計分析,在長壽命區(qū)采用配對升降法,得到了四種試樣的S-N曲線;對實驗結(jié)果進(jìn)行分析,得到三種不同表面改性處理的試樣與原始試樣的疲勞S-N曲線的差異;利用掃描電子顯微鏡對疲勞試樣的斷口進(jìn)行分析,研究了疲勞斷裂的形成、擴展,得到不同工藝試樣疲勞裂紋源區(qū)、擴展區(qū)和瞬斷區(qū)的差異。(3)對經(jīng)過三種表面處理技術(shù)后的4145h鋼進(jìn)行了常溫常壓下的耐磨性研究。四種試樣分別進(jìn)行耐磨性實驗,得到了三種磨損量與時間的關(guān)系曲線,分析三種表面處理技術(shù)對試樣的耐磨性的影響。實驗發(fā)現(xiàn),在短期磨損過程中CVD處理技術(shù)對試樣耐磨性增強較大。利用顯微硬度儀器對試樣沿徑向方向進(jìn)行測試,得到硬度值與距表面深度的關(guān)系曲線。(4)對經(jīng)過三種表面處理技術(shù)后的4145h鋼進(jìn)行了常溫常壓下的耐腐蝕性研究。四種試樣分別進(jìn)行飽和C02溶液腐蝕實驗,通過公式計算得出在不同浸泡時間下四種試樣的腐蝕速率。將三種表面處理試樣與原始試樣的腐蝕速率與時間關(guān)系曲線做對比,分析三種表面處理技術(shù)對材料的耐腐蝕性的影響。利用掃描電鏡對試樣斷口和腐蝕表面形貌進(jìn)行觀察分析。
[Abstract]:As a strategic material, petroleum plays an important role in the development of our national economy, but the petroleum resources in our country are very short.In order to ensure the national energy security, the difficulty of petroleum exploration and development is becoming more and more difficult. The number of drilling wells with complex structures, such as deep wells, ultra-deep wells, large deviations and large displacement wells, has increased exponentially, and the failure of drilling tools has occurred from time to time.The drilling safety and economic benefits are seriously affected.In this paper, based on a large number of related literature on drilling tool failure analysis and prevention, the material properties of 4145h steel in downhole tools are systematically studied in combination with drilling site failure conditions, and the stress conditions of downhole tools are complex.The effects of three surface modification techniques on the material properties of downhole tools have been explored in the long service under adverse working conditions such as alternating stress, friction and wear, corrosion environment and so on.In this paper, the following aspects of the study: 1) through a large number of research on three kinds of surface modification technology related literature, determine the CVD vapor deposition treatment,The process parameters of laser quenching and QPQ salt-bath composite heat treatment.4145h steel was selected as the experimental material. According to the national standard HB5287-96 < method of axial loading fatigue test of metal materials, the standard materials were made and processed.The fatigue resistance of 4145h steel after three surface treatment techniques was studied under normal temperature and atmospheric pressure.The rotating bending fatigue tests were carried out on different surface modified samples and original samples. The S-N curves of four kinds of specimens were obtained in the long life region by the method of pairing up and down, and the statistical analysis of the experimental data was carried out by using the group method in the middle and short life region.By analyzing the experimental results, the differences of fatigue S-N curves between the three different surface modification samples and the original samples are obtained, and the fracture surface of the fatigue specimen is analyzed by scanning electron microscope (SEM), and the formation and propagation of fatigue fracture are studied.The wear resistance of 4145h steel after three surface treatment techniques was studied at room temperature and atmospheric pressure.The wear resistance of four kinds of specimens was tested, and the relationship curves between three kinds of wear amount and time were obtained, and the effects of three surface treatment techniques on the wear resistance of the samples were analyzed.It was found that the wear resistance of the samples was enhanced by CVD treatment during short-term wear.The corrosion resistance of 4145h steel after three surface treatment techniques was studied by means of microhardness test in radial direction, and the relationship curve between hardness value and depth from surface to surface was obtained. The corrosion resistance of 4145h steel was studied at room temperature and atmospheric pressure.The corrosion rates of the four samples were calculated by the formula under different immersion time.The relationship curves of corrosion rate and time between the three surface treatment samples and the original samples were compared and the effects of the three surface treatment techniques on the corrosion resistance of the materials were analyzed.The fracture and corrosion surface morphology of the specimens were observed and analyzed by scanning electron microscope (SEM).
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TE982;TG142.12

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本文編號：1769490