本文選題：氧化物冶金 + 銅元素　； 參考：《貴州大學(xué)》2016年碩士論文

【摘要】：從“氧化物冶金”理念出發(fā),應(yīng)用非均質(zhì)形核理論,研究超細(xì)夾雜物對銅元素偏析行為的影響。對MnS、Ti2O3、TiC、Al2O3、SiO2、TiN等夾雜物進(jìn)行了熱力學(xué)計(jì)算;利用潤濕角模型計(jì)算了各自的形核功和潤濕角,結(jié)果表明,這些夾雜物能夠促進(jìn)鋼液的非均質(zhì)形核�；邳c(diǎn)陣錯(cuò)錯(cuò)配度理論,對MnS、Ti2O3、TiC、Al2O3、SiO2、TiN等夾雜物進(jìn)行了晶體學(xué)計(jì)算,結(jié)果表明Al2O3、Ti2O3、MnS、SiO2與?-Cu的錯(cuò)配度較小;TiC、TiN與銅的各種析出相匹配度均較差;氧化物夾雜與硫化銅相之間的匹配度較差;MnS與銅的各種析出相匹配度都較好。實(shí)驗(yàn)選取純鐵作為熔煉母料,以真空熔煉爐熔煉的0.6%Cu和Q295GNH耐候鋼0.278%Cu等不同含銅量的鋼作為實(shí)驗(yàn)材料,選取850℃、950℃、1050℃、1150℃的溫度梯度段進(jìn)行熱處理,保溫時(shí)間為120min;采用OM(金相顯微鏡)、SEM(掃描電鏡)、EDS(能譜)等手段觀測試樣中銅元素析出行為。空白實(shí)驗(yàn)組的結(jié)果表明,銅元素主要分布在晶界,且溫度越高,晶界處的含量越高;對照實(shí)驗(yàn)組的結(jié)果表明,銅元素主要富集在以MnS為主的超細(xì)夾雜物中,形成以MnS為核心的復(fù)合夾雜,且溫度越高,銅以MnS為形核核心進(jìn)行非均質(zhì)形核的數(shù)量增加,使得銅在晶內(nèi)形核,被釘扎在了晶內(nèi),降低了銅在晶界處的富集程度。實(shí)驗(yàn)結(jié)果驗(yàn)證了理論計(jì)算結(jié)果,說明銅元素能夠以鋼中超細(xì)夾雜物作為形核質(zhì)點(diǎn)進(jìn)行非均質(zhì)形核,為以后尋找能有效誘導(dǎo)銅元素析出的超細(xì)夾雜物提供了理論基礎(chǔ)。
[Abstract]:Based on the concept of "oxide metallurgy", the effect of ultrafine inclusions on the segregation behavior of copper elements was studied by using heterogeneous nucleation theory. The thermodynamic calculation of inclusions such as MNS Ti2O3TiC2O3Al2O3SiO2TiN and their nucleation work and wetting angle were carried out by using the wetting angle model. The results show that these inclusions can promote the heterogeneous nucleation of molten steel. Based on the theory of lattice mismatch, the crystallographic calculation of the inclusions such as MnSTi2O3TiC2O3TiC2O3Al2O3SiO2TiN and other inclusions has been carried out. The results show that the mismatch between Al _ 2O _ 3-Ti _ 2O _ 3O _ 3mn _ 2O _ 3 Sio _ 2 and Cu is smaller and the mismatch of the precipitated phases between tin and copper is poor. The matching degree between oxide inclusions and copper sulphide phases is worse than that between MNS and copper precipitates. Pure iron was selected as the master batch, 0.6Cu and Q295GNH weathering steel 0.278Cu were selected as experimental materials, and the temperature gradient of 850 鈩，

本文編號：2055599