【摘要】：由于常規(guī)QPQ技術(shù)處理的工件化合物層只有15μm左右,不能滿足工件耐磨性和抗腐蝕性能方面的更高要求,而深層QPQ技術(shù)處理的化合物層厚度達(dá)到30μm以上,所以能夠用來處理更高要求的零件；45鋼作為應(yīng)用廣泛的中碳鋼,因此研究其深層QPQ處理工藝對該技術(shù)的進(jìn)一步應(yīng)用推廣有著重要的意義。本文對45鋼的深層QPQ處理工藝進(jìn)行了工藝試驗(yàn),研究了氰酸根、溫度、氮化時(shí)間對滲層的影響；并用光學(xué)顯微鏡、掃描電鏡、X射線衍射儀分析了滲層組織以及形貌；討論了不同QPQ處理工藝的45鋼在力學(xué)性能、磨損性能、抗腐蝕性能等方面的差異。結(jié)果表明：45鋼深層QPQ工藝處理后的滲層組織由外及里是氧化膜、疏松層、化合物層、中間層和擴(kuò)散層；化合物層深度達(dá)到35gm以上,疏松層小于10μm,表面硬度HV0.1≥600；氮元素分布在整個(gè)化合物層比較平緩,最高氮濃度并不在滲層的最表面;滲層中的白兩層主要由Fe3O4、ε相、Fe4N相組成,中間層由Fe4N和α組成,不同冷卻方式獲得的中間層的相不同;相比常規(guī)QPQ處理,深層QPQ處理能提高沖擊韌性、延伸率和斷面收縮率,但同時(shí)又使屈服強(qiáng)度、抗拉強(qiáng)度降低；與常規(guī)QPQ處理的45鋼相比經(jīng)深層QPQ處理后,45鋼的滾動(dòng)磨損性能提高2.8倍,滑動(dòng)磨損性能提高4倍；45鋼抗腐蝕失重性為常規(guī)QPQ處理的13.3倍；45鋼深層QPQ處理試樣鹽霧試驗(yàn)的生銹時(shí)間是常規(guī)QPQ處理的1.78倍；深層QPQ處理+密封劑試樣鹽霧試驗(yàn)的生銹時(shí)間是常規(guī)QPQ處理的5.1倍,且45鋼試樣經(jīng)深層QPQ處理+密封劑處理后,抗中性鹽霧腐蝕能力都大于300h。
[Abstract]:Because the compound layer of workpiece treated by conventional QPQ technology is only about 15 渭 m, it can not meet the higher requirements of wearability and corrosion resistance of workpiece, while the thickness of compound layer treated by deep QPQ technology is more than 30 渭 m. So can be used to handle higher requirements of the parts; 45 steel is widely used as medium carbon steel, so it is of great significance to study the deep QPQ treatment process for the further application of the technology. In this paper, the effects of cyanate, temperature and nitriding time on the surface layer of 45 steel were studied by QPQ treatment, and the microstructure and morphology of the layer were analyzed by means of optical microscope, scanning electron microscope, X-ray diffractometer, scanning electron microscope (SEM), X-ray diffractometer (XRD), X-ray diffraction (XRD) and scanning electron microscope (SEM). The differences in mechanical properties, wear properties and corrosion resistance of 45 steel treated with QPQ were discussed. The results show that the microstructure of the deep layer of 45 steel treated by QPQ process is oxide film, loose layer, compound layer, intermediate layer and diffusion layer, the depth of compound layer is more than 35gm, the loose layer is less than 10 渭 m, and the surface hardness HV0.1 is 鈮，

本文編號：2300890