常化与退火工艺对50W470H无取向硅钢磁性能的影响

研究了常化温度和退火温度对冷轧无取向硅钢的显微组织和磁性能的影响。结果表明,常化温度升高,铁损呈先降低后升高的趋势,磁感应强度波动程度小。退火温度升高,铁损逐步降低,磁感应强度同样波动程度小。在常化1000℃-1050℃+退火925℃-1025℃下能获得最佳磁性能,最佳磁性能P1.5/50=2.5W/kg-2.9W/kg、磁感B50=1.74-1.76T。     

磁场退火对冷轧无取向硅钢微观组织的影响

在正交实验基础上,研究磁场退火工艺对0.5 mm厚的0.3%Si冷轧无取向硅钢微观组织的影响.分析了磁场强度、退火温度和保温时间对无取向硅钢微观组织的影响.实验结果表明,退火温度是影响无取向硅钢晶粒尺寸的最主要因素,其次是保温时间与磁场强度.磁场强度一定时,随着退火温度的升高、保温时间的延长,晶粒尺寸有长大的趋势,并且晶粒均匀性有所提高.在实验条件下,当施加的磁场强度为1 T、退火温度为800℃、保温时间为60 min时,晶粒尺寸最大.     

无取向硅钢晶粒与晶界特征的EBSD分析

借助电子背散射衍射（EBSD）技术测量和计算了无取向硅钢再结晶退火后再结晶百分比、晶粒尺寸、取向差分布等参数,分析了再结晶退火温度对无取向硅钢晶粒大小、微观取向和耐蚀性的影响。结果表明,3个温度（810、840、880℃）下退火3 min后,再结晶均充分完成。随着退火温度的升高,再结晶晶粒尺寸长大。拥有{100}面织构的晶粒比其他取向晶粒具有更好的耐蚀性,侵蚀后晶粒凸出于试样表面。880℃退火后的小尺寸晶粒周围多为小角度晶界,不易迁移,不易被侵蚀。     

蚀坑法研究冷轧及退火工艺对无取向硅钢织构演变的影响

以太原钢铁公司经酸洗后的热轧低硅板卷为实验材料,采用蚀坑法研究了一定退火工艺及不同冷轧工艺对无取向硅钢织构的影响,结果表明,总变形量及退火工艺是影响织构形成的重要因素,采用可逆轧制方法(冷轧总变形量控制在70%左右,分8道次完成,并且平均分配各道次压下率)和890 ℃加热,保温4 min,然后水冷,可以获得较高的{100}面系织构组分占有率的无取向硅钢.     

化学成分及退火温度对连续退火再结晶织构的影响

在MULTIPAS平台上模拟了不同化学成分的IF钢的两种连续退火生产方案。通过X衍射仪和全自动拉伸试验机对样品进行了检测,结合织构分布及力学性能分析了化学成分及退火温度等对IF钢再结晶织构的影响。研究发现当退火温度大于800℃时,退火温度对〈111〉//ND织构强度无显著影响,得到了C、N、Ti元素含量与样品织构的关系。     

冷轧无取向硅钢的实验研究

采用正交实验法进行了模拟实验,研究冷轧及退火工艺参数对无取向硅钢的晶粒度及显微硬度的影响,得到了无取向硅钢最佳冷轧及退火工艺．     

再结晶退火对稀土铝箔组织与织构的影响

由铈的质量分数0.004 8%的稀土铝锭均匀化退火、热轧、冷轧制成0.11 mm厚的稀土铝箔.运用Axiovert25型金相显微镜和蚀坑法,对退火后的稀土铝箔组织和织构进行研究.通过不同温度、不同时间的再结晶退火,得到530℃,600 s时稀土铝泊立方织构含量最高.     

退火温度对Ti-IF钢性能及织构的影响

对冷轧压下率为80%、厚1 mm的Ti-IF钢经不同温度退火处理后进行拉伸试验,测量其塑性应变比r值。观察退火试样的显微组织,并利用电子背散射衍射技术（EBSD）对其性能和再结晶织构进行分析。结果表明,冷轧试验钢分别在780、810、840℃退火3 min后,均发生了再结晶;随着退火温度的升高,大多数晶粒尺寸由5-6μm增大到9-10μm;试验钢的r值随退火温度升高而增大;退火钢再结晶织构表现为强烈的{111}织构,主要由{111}〈110〉和{111}〈112〉两类取向晶粒组成。     

Behaviors of different inhibitors during secondary recrystallization of a grain-orientated silicon steel

The behaviors of different inhibitors including their composition, size, distribution, coalescence and coarsening were experimen-tally studied. It was observed that during secondary recrystallization of the tested steel, the key inhibition effect was produced by Cu2S and AlN, but not MnS. With the increase of temperature, the size distributions of AlN and Cu2S were changed to some extent. However, signifi-cant changes in particle size were not observed. The initial temperature of abnormal growth was determi...     

CSP薄板冷轧退火组织和织构的研究

采用EBSD分析方法,对CSP试验钢冷轧板退火过程中组织转变和再结晶织构的演变进行分析,结果表明,在退火过程中,α取向线上的{112}<110>和{110}<110>织构的取向密度基本上没有变化,{100}<110>织构的取向密度是逐渐降低的,而{111}<110>织构有所增强,γ取向线上{111}<011>和{111}<112>织构都是呈先降低后升高的趋势,而且最终{111}<011>和{111}<112>两种织构的取向密度趋于相等,分别为5.28和5.24.     

High temperature plastic deformation behavior of non-oriented electrical steel

High temperature plastic deformation behavior of non-orientated electrical steel was investigated by Gleeble 1500 thermo-mechanical simulator at strain rate of 0.01−10 s⁻¹ and high temperature of 500–1 200 °C. The stress level factor (a), stress exponent (n), structural factor (A) and activation energy (Q) of high temperature plastic deformation process of non-orientated electrical steel in different temperature ranges were calculated by the Arrhenius model. The results show that, with dynamic elevation of deformation temperature, phase transformation from α-Fe to γ-Fe takes place simultaneously during plastic deformation, dynamic recovery and dynamic recrystallization process, leading to an irregular change of the steady flow stress. For high temperature plastic deformation between 500 and 800°C, the calculated values of a, n, A, and Q are 0.039 0 MPa⁻¹, 7.93, 1.9×10¹⁸ s⁻¹, and 334.8 kJ/mol, respectively, and for high temperature plastic deformation between 1 050 and 1 200 °C, the calculated values of a, n, A, and Q are 0.125 8 MPa⁻¹, 5.29, 1.0×10²⁸ s⁻¹, and 769.9 kJ/mol, respectively. Foundation item: Project(2005038560) supported by the Postdoctoral Foundation of China; Project(05GK1002-2) supported by Key Program of Hunan Province