本文選題：齒輪鋼　切入點：淬透性　出處：《鋼鐵研究總院》2017年博士論文　論文類型：學位論文

【摘要】：淬透性在齒輪鋼的生產和應用中具有重要的作用,窄淬透性帶寬是高品質齒輪鋼的重要特點之一。目前,國內齒輪鋼淬透性帶寬只能穩(wěn)定控制在8 HRC以內,與4 HRC國外先進水平有明顯差距。因此,開展齒輪鋼淬透性及其對組織和性能影響的研究,具有重要的工程價值。本論文選擇四種具有不同淬透性的滲碳齒輪鋼作為研究對象,對比研究了四種齒輪鋼的端淬曲線變化規(guī)律及影響因素,優(yōu)化了硬度分布函數淬透性預測模型,并通過500 ℃臨界冷速完善了組織預測模型,同時研究了淬透性對滲碳熱處理變形的影響規(guī)律,探討了滲碳齒輪鋼的旋轉彎曲疲勞和接觸疲勞性能的影響因素�；诙酄t次端淬試驗結果,在評價20CrMoH和20CrNiMoH齒輪鋼的淬透性預測模型適用性的基礎上,對淬透性預測模型進行了修正,修正后的硬度分布函數模型在J5、J9和J15點硬度預測標準誤差均小于2 HRC。研究發(fā)現,當晶粒度超過7級后,晶粒度對淬透性的影響明顯,若將J9處淬透性帶寬控制在≤4 HRC,晶粒度級別波動應≤1級。利用ABAQUS有限元軟件建立了齒輪鋼末端淬火試樣溫度場模型,結合Maynier組織預測模型對端淬試樣J5、J9和J15處的組織和硬度進行預測,利用500 ℃的瞬時冷速預測組織和硬度值與試驗值吻合較好。利用以上模型對20CrNiMoH鋼J9處組織和硬度預測結果表明,若J9處淬透性帶寬控制在≤4 HRC,馬氏體含量的波動不應超過16.7%。C型缺口試樣試驗結果表明,滲碳熱處理變形隨著齒輪鋼淬透性的提高而增加,熱處理變形量大小主要與心部馬氏體組織含量有關。當20CrNiMoH鋼J9處硬度低于32 HRC時,心部組織以貝氏體為主,熱處理變形量隨淬透性的提高緩慢增加;當J9處硬度超過32 HRC時,心部組織以馬氏體為主,馬氏體含量和熱處理變形量隨淬透性的提高顯著增加。不同齒輪鋼的熱處理變形率也與J9處硬度值呈正相關。齒輪鋼旋轉彎曲疲勞強度主要與滲碳層硬度、夾雜物的大小及分布、以及晶粒尺寸有關,滲碳齒輪鋼裂紋起裂主要源于滲碳層內夾雜物。20CrNiMoH鋼接觸疲勞試樣剝落坑深度在赫茲理論最大切應力附近,并且與夾雜物的分布有關。提高潔凈度、細化滲碳層晶粒尺寸,能改善齒輪鋼的疲勞性能。
[Abstract]:Hardenability plays an important role in the production and application of gear steel, narrow hardenability band is one of the important characteristics of high quality gear steel. At present, the bandwidth is only stable within 8 HRC through domestic gear steel quenching, there is difference between the 4 and HRC foreign advanced level. Therefore, the research development of gear steel hardenability and its effects on Microstructure and mechanical properties, which has important engineering value. This paper selects four different hardenability of carburized gear steel as the research object, a comparative study of the factor of the Jominy curve and the influence of the four kinds of gear steel, optimize the hardness distribution function of hardenability prediction model, and by 500 degrees the critical cooling rate improve the organization prediction model, also studied the influence of hardenability of carburizing heat treatment deformation, discusses the influence factors of carburized gear steel rotary bending fatigue and contact fatigue performance. Based on multi The furnace end quenching test results in the evaluation of 20CrMoH and 20CrNiMoH gear steel hardenability prediction based on the applicability of the model, the hardenability prediction model is modified, the modified hardness distribution function model in J5, J9 and J15 hardness standard error of prediction was less than 2 HRC. study found that when the grain size more than 7, the effects of grain size on the hardenability of the obvious, if the J9 hardenability bandwidth control in less than 4 HRC, the grain size level fluctuation should be less than or equal to 1. Established the model of temperature field of steel end quenching gears using ABAQUS finite element software, combined with the Maynier organization prediction model of Jominy J5 the organization, and the hardness of J9 and J15 at 500 DEG C predicted using instantaneous cooling rate prediction of microstructure and hardness values agree well with the experimental results. Using the above model and the hardness of 20CrNiMoH steel J9 Organization predicted results show that if J9 hardenability bandwidth control in H 4 RC, the content of martensite fluctuations should not exceed 16.7%.C notched specimens test results show that the heat treatment distortion increases with the hardenability of gear steel for improved heat treatment the amount of deformation is mainly related with the heart of martensite content. When the 20CrNiMoH steel J9 hardness is lower than 32 HRC, the heart tissue to bainite, heat treatment deformation with hardenability improved slowly increased; when the J9 hardness is more than 32 HRC, the heart tissue to martensite and martensite content and heat treatment to improve the deformation with hardenability increased significantly. Different heat treatment of gear steel deformation rate is positively correlated with J9 the hardness value. The rotary bending fatigue strength of gear steel with carburizing hardness, size and distribution of inclusions, and the grain size of carburized gear steel crack mainly due to inclusions in.20CrNiMoH Steel Carburized Layer contact fatigue spalling pits The depth is in the vicinity of the maximum shear stress in Hertz theory, and is related to the distribution of inclusions. Improving the cleanliness and refining grain size of carburized layer can improve the fatigue performance of gear steel.

【學位授予單位】：鋼鐵研究總院
【學位級別】：博士
【學位授予年份】：2017
【分類號】：TG142.1;TG161

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