發(fā)布時(shí)間：2018-04-24 09:08

  本文選題：DH鋼 + CCT曲線(xiàn)　； 參考：《熱加工工藝》2017年24期

【摘要】：采用Linseie L78 RITA淬火/相變熱膨脹儀測(cè)定了DH36高強(qiáng)度船板鋼的相變點(diǎn),繪制了連續(xù)冷卻轉(zhuǎn)變曲線(xiàn)。通過(guò)光學(xué)顯微鏡和顯微硬度法分析了冷卻速率對(duì)相變組織演變規(guī)律及對(duì)針狀鐵素體形成的影響。結(jié)果表明:冷卻速率0.5~3℃/s時(shí),轉(zhuǎn)變產(chǎn)物為多邊形鐵素體和珠光體;冷卻速率5~10℃/s時(shí),轉(zhuǎn)變產(chǎn)物為大量針狀鐵素體和少量貝氏體,珠光體消失;冷卻速率15~100℃/s時(shí),轉(zhuǎn)變產(chǎn)物主要由粒狀貝氏體和鐵素體組成,并開(kāi)始形成板條馬氏體,隨冷速的增加其顯微硬度呈增大趨勢(shì)。5~7℃/s的冷卻速率范圍是獲得針狀鐵素體的最佳冷速區(qū)間,在7℃/s冷速下,觀(guān)察到了Al-Si-Ti-O-S-Mn系復(fù)合夾雜物所誘發(fā)的呈發(fā)散狀多維形核的晶內(nèi)針狀鐵素體。
[Abstract]:The transformation point of DH36 high strength shipboard steel was measured by Linseie L78 RITA quenching / phase change thermal expansion instrument, and the continuous cooling transformation curve was drawn. The effect of cooling rate on the evolution of phase transformation and the formation of acicular ferrite was analyzed by means of optical microscope and microhardness method. The results show that the transition products are polygonal ferrite and pearlite at cooling rate of 0.5 ~ 3 鈩，

本文編號(hào)：1796018