本文選題：51CrV4彈簧鋼 + 夾雜物��； 參考：《江西理工大學》2017年碩士論文

【摘要】：隨著汽車工業(yè)的大力發(fā)展,我國在一般強度、高強度彈簧鋼生產(chǎn)技術(shù)方面已經(jīng)成熟,獲得了很多創(chuàng)新成果,并進行了產(chǎn)業(yè)化推廣,但針對超高強度、高質(zhì)量等級彈簧鋼的工藝技術(shù)方面還沒有完全突破,還遠未達到產(chǎn)業(yè)化水平,仍有很多基礎(chǔ)技術(shù),工程化技術(shù)需要研究開發(fā)。本文對國內(nèi)某鋼廠生產(chǎn)的51CrV4彈簧鋼的基礎(chǔ)技術(shù)進行了相關(guān)研究,主要包括典型夾雜物分析研究、第二相析出規(guī)律研究和奧氏體動態(tài)再結(jié)晶規(guī)律研究。本論文研究的最終成果是為國內(nèi)某鋼廠高強度優(yōu)質(zhì)彈簧扁鋼51CrV4的生產(chǎn)提供技術(shù)上的支持,以達到整個生產(chǎn)流程的工藝技術(shù)提升,研究結(jié)果表明:顯微夾雜物主要以條形、類球形為主,數(shù)量較多,根據(jù)對顯微夾雜物統(tǒng)計結(jié)果,其中10μm以下占絕大多數(shù),顯微夾雜物種類主要為部分MnS,少量Al_2O_3夾雜,Al_2O_3-CaOSiO_2復合夾雜物居多。大型夾雜物含量較高,種類主要有CaO類夾雜;Al_2O_3-SiO_2-Cr_2O_3-CaS-FeS復合夾雜物;(Cr、V)_2O_3-SiO_2-FeS復合夾雜物;SiO_2-CaO-Cr_2O_3-Al_2O_3-MgO復合夾雜物;Al_2O_3-SiO_2-TiO復合夾雜物;Al_2O_3夾雜或Al_2O_3-CaO夾雜;Al_2O_3-SiO_2夾雜物和硅酸鹽類夾雜;在計算溫度范圍內(nèi)的主要析出相有:FCC_A1,MnS,FCC_A1#2,BCC_A2,M_7C_3,DIAMOND_FCC_A4,M_(23)C_6,FCC_A1,M_3C_2。合金元素Cr和V含量的改變對析出相MnS、BCC-A2和FCC-A1幾乎沒有影響,對析出相FCC-A1#2,M_7C_3和M_3C_2影響較大。其中Cr含量對FCC-A1#2析出相影響不大,開始析出溫度,最大析出量和最大析出量時溫度,隨著V含量的增加而增大;V含量對M_3C_2和M_7C_3析出相相關(guān)參數(shù)影響不大,最大析出量隨著Cr含量的增加而增大,Cr含量對其他相關(guān)析出參數(shù)影響不大;當其他壓縮變形參數(shù)一定時,變形溫度在800-950℃的工藝條件下,奧氏體平均晶粒直徑隨著變形溫度的增加而減小,在950℃的變形溫度下得到的晶粒直徑最小,晶粒度最大;在0.01-1 s-1變形速率下,隨著應變速率的增加,奧氏體晶粒直徑減小;當高于1 s-1的變形速率,奧氏體晶粒直徑進一步增大;當其他變形工藝參數(shù)一定時,隨著應變值的增加,晶粒直徑減小,晶粒度增大。
[Abstract]:With the rapid development of automobile industry, our country has matured in general strength, high strength spring steel production technology, obtained many innovative achievements, and carried on the industrialization promotion, but aimed at the ultra high strength, The process technology of high quality grade spring steel has not completely broken through, has not reached the industrialization level, still has many basic technologies, the engineering technology needs to be researched and developed. In this paper, the basic technology of 51CrV4 spring steel produced by a domestic steel factory has been studied, including the analysis of typical inclusions, the precipitation of the second phase and the dynamic recrystallization of austenite. The final achievement of this paper is to provide technical support for the production of high strength and high quality spring flat steel 51CrV4 in a domestic steel plant, so as to improve the process technology of the whole production process. The results show that the microinclusions are mainly strip shape. According to the statistical results of microscopic inclusions, the majority of them are below 10 渭 m, the types of microscopic inclusions are mainly MNS, and a small amount of Al2O3 inclusions include Al2O3-CaOSiO-2 composite inclusions. The main types of large inclusions are: al _ 2O _ 3-SiO _ 2-CaS _ 2O _ 2-SiO _ 2-Al _ 2O _ 3-SiO _ 2-TiO _ 2 composite inclusions, Al2O3-SiO3-SiO2-TiOII, Al2O3-Ca2O3-Ca2O3-CaO / Al _ 2O _ 3-CaO / Al _ 2O _ 3-CaO _ 2O _ 3, Al _ 2O _ 3-CaO _ 2O _ 2 and Al _ 2O _ 3-CaO _ 2O _ 2 inclusions and silicate inclusions; The main precipitating phases in the range of calculation temperatures are: 1 FCCA1MnSCCA1 / FCCA1 / BCCA2 / BCCA2 / M7C3 / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C The changes of Cr and V contents have little effect on the precipitated phase MnS+ BCC-A2 and FCC-A1, but have a great effect on the precipitated phase FCC-A1 #2M7CStud3 and M3CSP _ 2. The Cr content has little effect on the precipitating phase of FCC-A1 #2, but the temperature at the beginning of precipitation, the temperature at the maximum amount of precipitation and the maximum amount of precipitate, and the increase of the content of V with the increase of V content have little effect on the parameters of the precipitated phase of M3CStut2 and M7C3. The maximum amount of precipitation increases with the increase of Cr content and has little effect on other related precipitation parameters, and when other compression deformation parameters are fixed, the deformation temperature is between 800 鈩，

本文編號：1998121