本文選題：溫軋　切入點(diǎn)：Fe-3%Si　出處：《沈陽化工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：本文以Cu_2S和MnS為主要抑制劑,以含硅3%的取向硅鋼為材料,進(jìn)行不同溫度的溫軋?jiān)囼?yàn),通過金相、EBSD、XRD和TEM等手段研究熱軋、溫軋、初次再結(jié)晶退火和二次再結(jié)晶退火各個(gè)工藝階段的組織、織構(gòu)和析出物的演化規(guī)律。用磁性能檢測儀對(duì)四種溫軋溫度的二次再結(jié)晶退火后的鋼帶進(jìn)行磁性能檢測,根據(jù)硅鋼低鐵損和高磁感的性能要求優(yōu)化出合理的溫軋工藝參數(shù),為高性能電工鋼帶的開發(fā)提出新的方法和途徑,實(shí)現(xiàn)綠色化,低成本,高性能取向硅鋼的開發(fā)。本文得出的主要結(jié)論如下:(1)取向硅鋼熱軋板沿厚度方向的組織不均勻,表層晶粒的平均尺寸為30μm,形狀為等軸晶;過渡層和中心層為拉長的鐵素體晶粒和帶狀的碳化物,其平均晶粒尺寸為15.8μm。溫軋后,表層和中心層均為纖維狀組織。溫軋板初次再結(jié)晶組織均為細(xì)小的等軸晶,沿厚度方向的表層晶粒比中心層晶粒細(xì)小。二次再結(jié)晶退火之后,初次再結(jié)晶組織發(fā)生異常長大。50℃、100℃、200℃和300℃溫軋?jiān)嚇拥亩卧俳Y(jié)晶組織平均晶粒尺寸分別為3.5mm,2.3mm,4.5mm和3.8mm。(2)隨著溫軋溫度的增加,取向硅鋼成品板鐵損值逐漸增加,磁感值先增加后減小,在200℃溫軋樣品中達(dá)到最大值。50℃溫軋時(shí)成品板磁感應(yīng)強(qiáng)度和鐵損分別為B8=1.711T,P1.7/50=2.975W/Kg;200℃溫軋時(shí)磁感應(yīng)強(qiáng)度和鐵損分別為B8=1.780T,P1.7/50=3.229W/Kg。(3)50℃、100℃、200℃和300℃四種不同的溫軋板均以α(110//RD)織構(gòu)為主,最強(qiáng)點(diǎn)為{001}110,同時(shí)也存在較強(qiáng)的γ(111//ND)織構(gòu),且表層比中心層強(qiáng)。初次再結(jié)晶退火后,α織構(gòu)顯著減弱,γ織構(gòu)成為主要部分,且出現(xiàn)了較弱的Goss({110}001)織構(gòu)。整體而言,50℃和200℃溫軋時(shí),α和γ織構(gòu)強(qiáng)度最強(qiáng)。(4)熱軋板中小角晶界與大角晶界的比例約為3:2,溫軋板中小角晶界與大角晶界的比例增加至約3:1,其中Σ3~Σ11重位點(diǎn)陣晶界占有的比例較高。(5)熱軋時(shí)隨著溫度的降低,MnS先析出,隨后Cu_2S析出,熱軋板中主要以Cu_2S和MnS復(fù)合的形式析出,平均尺寸約為43nm,分布密度約為1.5×109個(gè)/cm2。溫軋板中同樣存在Cu_2S和MnS的復(fù)合析出物,而且在50℃溫軋板出現(xiàn)了少量的AlN析出。初次再結(jié)晶退火板中存在細(xì)小彌散的Cu_2S和MnS析出物,平均尺寸約為52.9nm,分布密度約為2.5×1010個(gè)/cm2,相對(duì)于熱軋板,析出粒子尺寸增加且更均勻,晶粒長大抑制能力較強(qiáng)。
[Abstract]:In this paper, Cu_2S and MnS were used as the main inhibitors, and silicon 3% oriented steel was used as the material. The hot rolling and warm rolling were studied by means of metallography, EBSD, XRD and TEM. The microstructure, texture and evolution of precipitates in the first recrystallization annealing and secondary recrystallization annealing. The magnetic properties of the steel strips after secondary recrystallization annealing at four temperature rolling temperatures were measured by magnetic property tester. According to the requirements of low iron loss and high magnetic inductance of silicon steel, reasonable warm rolling process parameters are optimized, and new methods and approaches for the development of high performance electrical steel strip are put forward to realize green and low cost. Development of high performance oriented silicon steel. The main conclusions obtained in this paper are as follows: (1) the microstructure of the hot rolled plate of oriented silicon steel along the thickness direction is not uniform, the average grain size of the surface layer is 30 渭 m and the shape is equiaxed. The transition layer and the center layer are elongated ferrite grains and banded carbides with an average grain size of 15.8 渭 m. After warm rolling, both the surface and center layers are fibrous, and the primary recrystallization structure of the warm rolled sheet is both fine equiaxed. The grain size in the surface layer along the thickness direction is smaller than that in the central layer. After secondary recrystallization annealing, The average grain size of the secondary recrystallization microstructure of the primary recrystallized specimens grown abnormally at .50 鈩，

本文編號(hào)：1627660