本文關(guān)鍵詞： Nb-V-Ti微合金鋼 超快冷 硬度 析出強(qiáng)化　出處：《金屬學(xué)報(bào)》2015年07期 　論文類型：期刊論文

【摘要】：以復(fù)合添加Nb,V和Ti的低碳微合金鋼為研究對(duì)象,采用熱模擬試驗(yàn)機(jī)模擬高溫軋制+超快速冷卻+緩冷工藝,采用OM,HRTEM和顯微硬度計(jì)等對(duì)超快冷至不同溫度實(shí)驗(yàn)鋼的組織轉(zhuǎn)變和析出規(guī)律進(jìn)行研究.結(jié)果表明,隨著超快冷終冷溫度的升高,顯微組織由貝氏體向珠光體和鐵素體轉(zhuǎn)變,碳化物形核位置從貝氏體轉(zhuǎn)變?yōu)殍F素體,鐵素體中的析出物密度大于貝氏體中的,且在620℃達(dá)到最大.超快冷至不同溫度時(shí)析出物的尺寸均小于10 nm,縱橫比均接近于1,即析出物形態(tài)更接近于球形,且隨終冷溫度的降低,析出物尺寸逐漸減小.利用Orowan機(jī)制計(jì)算了析出強(qiáng)化增量,得出在620℃析出強(qiáng)化對(duì)屈服強(qiáng)度的貢獻(xiàn)最大,可達(dá)到25.6%.
[Abstract]:Taking low carbon microalloyed steel with NB V and Ti as the research object, the super fast cooling slow cooling process of high temperature rolling was simulated by thermal simulation testing machine. The microstructure transformation and precipitation of ultrafast cooling to different temperatures were studied by means of OMW-HRTEM and microhardness tester. The results show that the microstructure changes from bainite to pearlite and ferrite with the increase of the final cooling temperature. The nucleation position of carbides changed from bainite to ferrite, and the density of precipitates in ferrite was higher than that in bainite. At 620 鈩，

本文編號(hào)：1499148