【正文】 這也是保證HSS部分具有高強度和無缺陷，如破裂和卷邊。圖6HSS樣品的熱成型和淬火前后顯微結構外觀3結論1）在生產線中，作為高速鋼迅速加熱至900℃，保持4分鐘，拉伸強度可以達到1530 ，奧氏體轉變將是不完整的，與此相反，如果溫度過高，細顆粒將增長過大。HSS的車輛在國內的研究大多局限于在實驗室做的，但先進的自動化生產技術是在實驗室中難以實現。原來的冷成型零件熱成型部件圖51熱成型和冷成型汽車零部件圖片初始樣品的主要微結構，還沒有得到熱成形和冷卻水驟冷，在圖6（a）中，組成的鐵素體，珠光體和少量的碳化物。但是，鐵素體和貝氏體的成核和生長將變得更慢，因為在晶界上的較低的能量梯度的，并且是有益的，使奧氏體穩(wěn)定，如果硼或處理參數的內容是不適合的，將沉淀成分硼超飽和在晶界上，成為新的沉淀相，這使得能量梯度放大的核，導致硬化樣品的能力下降。此外，不僅成形性和微觀結構的貢獻的基礎上，而且在成本上。汽車熱成型零件和原來的冷成型件的實際對比。通過高峰，應力 應變關系將變得更加復雜。位移/mm（a）應力 應變曲線 （b）試驗力 位移曲線圖4應力 應變曲線和拉伸試驗的試驗力位移從圖4（a）后，加熱至900℃時，樣品的微觀結構已經被完全變成奧氏體。一般而言，A是由主珠光體和少量的鐵素體，這是優(yōu)于馬氏體的韌性，因此，其變形是相對較好的。不同于在實驗室中，在本文中，成型和水冷卻系統(tǒng)的生產線中產生的樣品的相互作用機制可以客觀地顯示字符的質量的產品的制造性能和微觀結構。正如圖3所示，如果樣品迅速被加熱到900℃，空氣冷卻3，奧氏體的微觀結構得到完全。因此，機械性能，如拉伸強度和屈服強度，將得到改善。然后，根據分析的樣品室的拉伸強度，熱成形后在不同的溫度和淬火，最適溫度可以發(fā)現，如圖3。單位：mm圖1形狀和尺寸試樣圖2示出了樣品（）的拉伸強度和屈服強度，水冷淬火后，分別達到1500 MPa和1 000兆帕。試驗樣品的形狀和尺寸示于圖1。1實驗裝置另外，為了在高溫下形成高速鋼，以避免裂紋和回彈，樣品需要快速加熱和完全變換成穩(wěn)定的奧氏體組織。在本文中，形成硼鋼空白和水冷卻用模具驟冷的過程期間同時燙印。由國內自行設計的熱壓成型技術和水冷卻模具，汽車HSS可以生產替代國外汽車零部件。樣品沒有發(fā)生過回彈缺陷。del, et al. Mech anical Properties and Plastic Anisotropy of the Quenchenable High Strength Steel 22MnB5 at Elevated Temperatures [ J ] . Key Engineering Materials, 2007, 344: 79.[ 8] Geigera M, Merkleinb M, H off C. Basic Investigations on the Hot Stamping Steel 22MnB5 [ J] . Advanced Materials Research, 2005, 6( 8) : 795.熱壓成形技術對汽車高強度鋼性能影響常英，孟召喚，梁穎，李曉東，馬寧，胡平（學院汽車工程國家重點實驗室，工業(yè)裝備結構分析，大連理工大學，遼寧，大連，116024）摘要：基于材料科學和機械工程的結合上，車高強度鋼熱沖壓成型過程進行了分析。 based on “C”curve, even and closerow lath martensite microsructure obtained is also due to the optimal watercooling rate, so the content of residual phase is very little。 B is the sample which was heated at 900℃ for 4 min。 2) put the sample into the heat treated furnace to be heated for 4 min at a certain temperature。 hot forming 。 專業(yè)資料分享 Influence of Hot Press Forming Techniques on Properties of Vehicle High Strength Steels( Scho ol of Automotive Engineering , State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology , Dalian 116024, Liaoning, China)Abstract: Based on the bination of materials science and mechanicalengineering ,hotpress forming process of the vehicle high strength steels was analyzed. The hot forming processinclud ed: heating alloy srapidly to austenite micr ostructures, stamping and cooling timely,maintaining pressur eand quenching . The results showed that most of austenite micr ostructure w as changed into uniform mar tensite by the hot press form ing while the samples were heatedat 900 。 martensiteAs an effective economical energy measure, the lightw eight dev elo pment dir ection of automo bile has bee one of the most important research subjects in the automotive industry. There are three major ways to achieve automobile light weight : optimizing vehicle frames and struc tures。 3) remove it by mechanical hand and put it into the hot forming moulds to be pressed quickly 。 C is the sample after heat treatment and watercoo ling quenching. The deformation of A, B and C are 32% , 24% and 6% or so, respectively . Generally , A is posed of main pearlite and a small amount of ferrite, thetoughness of which is better than martensite, so its deformation is relatively better. B is posed with the hightemperature transitional microstructure of austenite, whose toughness is also better than martensite, and deformation is larger than the latter. C is posed of over 95% martensite and little austensite. Owing to its higher strength, toughness and plasticity of martensite are lower, that is to say , deformation of C is the lowest In Fig 4, when the sample was heated for 4 min and stretched at 900℃ , stressstrain curve and testforce displacement curve were obtained respect ively.From Fig4 ( a) , after being heated up to 900℃,the microst ructure of sample has been pletely turned into austenite. T he value in the elastic deformation stage of curve w ill tend towards the yield point , following the axial test force gradually being increased. That is to say, the obvious plastic deformation of sample will beg in after the yield point .When it is continuously stretched till the peak point of curve, the necking of sample will occur. Passing the peak, the st ressstrain relat ionship will bee more plex . From Fig 4 ( b) , after the corresponding