本文選題：CSP工藝　切入點：Hi-B鋼　出處：《武漢科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：針對傳統(tǒng)工藝生產(chǎn)Hi-B鋼的制造成本高、能源消耗大等諸多弊端，，CSP工藝生產(chǎn)Hi-B鋼的研究得到廣泛的關(guān)注。本文在實驗室條件下模擬CSP工藝制備Hi-B鋼，設(shè)計了從冶煉到二次再結(jié)晶退火的一系列工藝，借助EBSD和XRD技術(shù)對Hi-B鋼初次及二次再結(jié)晶退火過程中組織與織構(gòu)的演變規(guī)律進行了研究，并探討了不同工藝對Hi-B鋼二次再結(jié)晶的影響。主要結(jié)果如下： (1)Hi-B鋼在830℃下進行退火時僅15s初次再結(jié)晶完成，隨保溫時間的延長，晶粒逐漸長大，∑1晶界比例逐漸減小，∑3～∑9晶界比例變化不大，晶粒取向差的分布轉(zhuǎn)變?yōu)橐源蠼嵌染Ы鐬橹鳌?(2)以20℃/h的升溫速率進行高溫退火，Goss晶粒在1100℃發(fā)生異常長大，其長大過程不同于再結(jié)晶晶粒的正常長大；異常長大開始后，Goss晶粒才具有尺寸優(yōu)勢，Goss織構(gòu)逐漸占據(jù)主導(dǎo)地位。Hi-B鋼的二次再結(jié)晶過程分為三個階段，即緩慢長大階段、優(yōu)先長大階段和“吞噬”島狀晶粒階段。在不同階段，Goss晶粒長大機理不一樣。 (3)冷軋壓下量、�；幚砼c升溫速率都會影響Goss織構(gòu)的演變。過大或過小的壓下量都不利于Goss晶粒的異常長大；�；幚硎篃彳垥r基本不析出的AlN粒子大量析出，這種變化對Hi-B鋼初次再結(jié)晶組織與織構(gòu)沒有明顯影響，卻大幅度提高了二次再結(jié)晶晶粒尺寸；不合理的加熱速率會導(dǎo)致高度不均勻的組織和Goss織構(gòu)的弱化。
[Abstract]:In view of the disadvantages of manufacturing Hi-B steel by traditional process, such as high cost and large energy consumption, the research of producing Hi-B steel by CSP process has been paid more and more attention. In this paper, Hi-B steel is prepared by simulating CSP process in laboratory. A series of processes from smelting to secondary recrystallization annealing were designed. The evolution of microstructure and texture of Hi-B steel during primary and secondary recrystallization annealing was studied by means of EBSD and XRD techniques. The effects of different processes on the secondary recrystallization of Hi-B steel are discussed. The main results are as follows:. After annealing at 830 鈩

本文編號：1605106