【摘要】：利用掃描電鏡(SEM)和透射電鏡(TEM)等儀器研究卷取溫度對高Ti微合金熱軋高強(qiáng)鋼顯微組織和力學(xué)性能的影響。研究結(jié)果表明:隨著卷取溫度的升高,抗拉強(qiáng)度不斷減小,屈服強(qiáng)度先增加再減小,伸長率不斷增大。當(dāng)350℃卷取時,試驗鋼擁有良好的綜合力學(xué)性能,即抗拉強(qiáng)度為1 253 MPa,屈服強(qiáng)度為1 099 MPa,伸長率為13%,-20℃沖擊功為102 J。這是因為該卷取溫度略低于M_s點,試驗鋼顯微組織由大量板條貝氏體(細(xì)小且交織)、少量馬氏體和針狀鐵素體組成,這種顯微組織能有效阻礙位錯運動,從而提高強(qiáng)度。同時大角度晶界能夠阻礙裂紋擴(kuò)展,再加上板間的薄膜M/A,保證了材料的塑性和韌性。
[Abstract]:The effect of coiling temperature on the microstructure and mechanical properties of high strength hot rolled high strength steel with high Ti microalloy was studied by means of scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that the tensile strength decreases with the increase of the coiling temperature, and the yield strength increases first and then decreases, and the elongation increases continuously. When coiled at 350 鈩，

本文編號：2416215