【摘要】：為開發(fā)一種新的低成本高性能含B釩微合金鋼和建立其TMCP生產(chǎn)工藝,用MMS-200熱力模擬試驗(yàn)機(jī)研究了實(shí)驗(yàn)鋼在連續(xù)冷卻條件下的相變規(guī)律,繪制出實(shí)驗(yàn)鋼的靜態(tài)CCT曲線和動(dòng)態(tài)CCT曲線.結(jié)果表明:微量的B提高了釩微合金鋼過(guò)冷奧氏體穩(wěn)定性,促進(jìn)了針狀鐵素體形成,在比較寬的冷卻速度范圍內(nèi)能得到貝氏體組織;未變形鋼相比于變形鋼,在更低的冷卻速度甚至0.5℃/s的冷卻速度下能得到大部分的貝氏體組織,但兩者在5℃/s以上的冷卻速度下都得到全部貝氏體組織;變形降低了奧氏體穩(wěn)定性,促進(jìn)鐵素體轉(zhuǎn)變,含硼鋼鐵素體轉(zhuǎn)變存在的冷速升高到2℃/s,不含硼鋼的其冷速升高到15℃/s;釩微合金鋼中B有利于獲得高強(qiáng)度的貝氏體組織,冷速5℃/s以上時(shí)相變后含硼鋼的硬度都高于變形及未變形不含硼鋼的硬度.
[Abstract]:In order to develop a new low cost and high performance B vanadium microalloyed steel and establish its TMCP production process, the phase transformation law of experimental steel under continuous cooling condition was studied by MMS-200 thermal simulation test machine. The static CCT curves and dynamic CCT curves of experimental steel were drawn. The results show that the microelement B improves the austenitic stability of vanadium microalloyed steel and promotes the formation of acicular ferrite, and the bainite structure can be obtained in a wide range of cooling rate, and the undeformed steel is compared with the deformed steel. Most of the bainite structure can be obtained at lower cooling rate or even 0.5 鈩，

本文編號(hào)：2272531