【摘要】：在實(shí)驗(yàn)室利用Gleeble-3500熱模擬試驗(yàn)機(jī)對(duì)3種Nb、V微合金化Q355E熱軋H型鋼進(jìn)行了連續(xù)冷卻轉(zhuǎn)變規(guī)律測(cè)試,研究了冷卻速度對(duì)試驗(yàn)鋼組織與硬度的影響。結(jié)果表明:在冷速為0.5℃/s時(shí),組織中開(kāi)始出現(xiàn)貝氏體;冷速大于7℃/s時(shí),珠光體轉(zhuǎn)變即終止。在中等冷速下,Nb的加入促進(jìn)了貝氏體的形成,抑制了鐵素體與珠光體的形核;并且Nb的加入使鐵素體轉(zhuǎn)變區(qū)右移。Cr的加入降低了較高冷速下鐵素體與珠光體相變點(diǎn),并促進(jìn)了高冷速下馬氏體的形成。由于受V析出的影響,含V試驗(yàn)鋼在冷速為1℃/s時(shí)其硬度曲線有一個(gè)"波谷"。3種試驗(yàn)鋼的冷速在0.5~3℃/s之間時(shí),試驗(yàn)鋼可獲得強(qiáng)韌性較好的細(xì)小準(zhǔn)多邊形鐵素體、少量珠光體與貝氏體的復(fù)合組織。
[Abstract]:The continuous cooling transformation of three kinds of Nb, V microalloyed Q355E hot rolled H-beam was tested by Gleeble-3500 thermal simulation tester, and the effect of cooling rate on the microstructure and hardness of the test steel was studied. The results show that bainite begins to appear in the microstructure when the cooling rate is 0.5 鈩，

本文編號(hào)：2489861