【摘要】：結(jié)合Gleeble3500熱力模擬與工業(yè)試驗(yàn),通過顯微組織觀察、硬度測試、拉伸試驗(yàn)與TEM研究了形變與冷卻工藝對釩微合金化600 MPa級鋼筋組織、力學(xué)性能及析出相的影響。結(jié)果表明:試驗(yàn)鋼的鐵素體轉(zhuǎn)變范圍廣,無變形且冷速大于5℃/s時,組織中開始形成貝氏體與馬氏體。相變前粗大的原奧氏體晶粒將促進(jìn)貝氏體與板條馬氏體形成;原奧氏體晶粒細(xì)小與低溫形變有利于鐵素體與島狀馬氏體的形成。冷速較小時,試驗(yàn)鋼經(jīng)形變后的硬度值大于無形變后的硬度值。冷速較大時,試驗(yàn)鋼無形變的硬度值大于形變后的硬度值。為了獲得細(xì)小鐵素體與珠光體以及細(xì)小彌散的氮化釩,最佳生產(chǎn)工藝為:終軋溫度大于1000℃,冷速為3℃/s;或終軋溫度為900℃,冷速為5℃/s。
[Abstract]:The effects of deformation and cooling process on microstructure, mechanical properties and precipitated phase of vanadium microalloyed 600MPa steel bar were studied by means of microstructure observation, hardness test, tensile test and TEM combined with Gleeble3500 thermal simulation and industrial test. The results show that the bainite and martensite begin to form in the microstructure when the ferrite transformation range is wide and the cooling rate is higher than 5 鈩，

本文編號：2463005