金属注射成形制备Fe-50%Ni软磁合金

以羰基铁粉和羰基镍粉为原料,采用金属注射成形(Metal injection molding,MIM)工艺制备Fe-50%Ni(质量分数)软磁合金,研究烧结气氛、烧结温度和时间以及热处理制度对其磁性能的影响。通过对不同工艺条件下试样的杂质含量、密度、金相和磁性能的分析,发现C、O等间隙杂质原子含量和热处理的冷却方式强烈地影响MIM Fe-50%Ni合金的最大磁导率和矫顽力,而相对密度是影响MIM Fe-50%Ni的饱和磁感应强度和初始磁导率的主要因素。试样经1 380℃氢气烧结3 h、650℃保温1 h再油淬,可获得最佳磁性能:饱和磁感应强度为1.496 T,矫顽力为4.8 A/m,最大磁导率为75.2 mH/m,初始磁导率为9.18 mH/m。     

粉末轧制法制备Fe-6.5%Si硅钢片的研究

采用粉末轧制法制备了Fe-6.5%(质量分数)Si硅钢片,并对其密度、物相组成和磁性能进行了测试分析.研究表明:在一定的轧制成形和烧结条件下,所制备的Fe-6.5%Si硅钢片的饱和磁感应强度Bs为1.8T;高频铁损W2/10k为69W/kg.     

稳恒磁场对循环电镀液Fe-Si复合电沉积行为的影响

研究了以Fe-50%Si合金颗粒及纯Si颗粒为原料,在稳恒磁场中用循环镀液复合电沉积制备Fe-Si复合镀层,考察了磁场方向、磁感应强度对Fe-Si复合镀层形貌及硅质量分数的影响。结果表明:施加磁场后,随磁感应强度增大,采用Fe-50%Si颗粒和纯Si颗粒获得的镀层硅质量分数显著增加;同时,在梯度磁场力和磁流体力学效应(MHD效应)协同作用下,镀层硅质量分数从边沿至中心呈"平底锅"状分布;电流密度为2A/dm~2、磁感应强度为0.5T时,用Fe-50%Si颗粒电镀获得的镀层硅质量分数达20%。     

FCVD-SPS法制备高硅钢软磁复合铁芯及电磁性能研究

采用流化气相原位沉积结合放电等离子烧结工艺成功制备了高硅钢软磁复合铁芯Fe-6.5% Si/SiO₂（质量分数）,并系统研究了复合铁芯微观结构与电磁性能的关系。结果表明,高硅钢软磁复合铁芯中的Fe-6.5% Si颗粒被SiO₂绝缘层均匀并且致密的包围,Fe-6.5% Si/SiO₂复合铁芯表现出高磁感、高电阻率、良好的频率稳定性、低矫顽力、以及低铁损等优异的电磁特性,饱和磁感应强度为175 emu·g-1,矫顽力为15 Oe,相对磁导率为350（80 kHz）,电阻率为8.6×10-5?·m,0.2 T、5 kHz外场下铁损仅为11.8 W·kg-1。     

高性能Fe-Si软磁粉芯的制备及性能研究

以Fe-6.5Si粉末为基粉、多组分无机氧化物作为粘结剂,通过温压成形、热处理制得Fe-Si软磁粉芯。分别使用扫描电子显微镜、振动磁强计对样品的密度、微观形貌以及磁性能等进行了测试分析。结果表明:粘结剂的含量、温压压力、温压温度对Fe-Si软磁粉芯的性能都会产生影响,在压制温度150℃、压制压力为900MPa时,粘结剂含量为1.5%(质量分数)的Fe-Si生坯密度可以达到6.34g/cm3,经过720℃氩气气氛下热处理后密度可达到6.58g/cm3,饱和磁感应强度为1.26T,矫顽力为0.81 kA·m-1。     

Si含量对高硅电工钢热变形与动态再结晶行为的影响

采用Gleeble-3800D热模拟试验机在应变量0.6、变形温度750~1050℃、应变速率0.01~1 s-1工艺条件范围内, 研究了Fe-(5.5%、6.0%、6.5%) Si高硅电工钢的热变形与动态再结晶行为.采用线性回归方法, 建立了三种成分实验钢的流变应力本构方程.计算得到Fe-5.5% Si、Fe-6.0% Si和Fe-6.5% Si高硅电工钢的热变形激活能分别为310.425、363.831和422.162 kJ·mol-1, 说明Fe-(5.5%、6.0%、6.5%) Si高硅电工钢的热变形激活能随Si质量分数的增加而增大, 这使得Fe-(5.5%、6.0%、6.5%) Si高硅电工钢相同条件下的变形抗力随Si含量的升高而增大.采用金相截线法对不同成分和变形条件下实验钢的动态再结晶百分数进行了统计, 结果表明: 同一热变形条件下, Fe-(5.5%、6.0%、6.5%) Si高硅电工钢的动态再结晶百分数随Si质量分数的升高而减小.本文实验条件下, 当变形温度为750~850℃时, Fe-(5.5%、6.0%、6.5%) Si高硅电工钢软化机制主要为动态回复; 而变形温度为950~1050℃时, Fe-(5.5%、6.0%、6.5%) Si高硅电工钢软化机制主要为动态再结晶.      

Fe-6.5Si软磁合金粉末制备工艺方法的研究

通过添加适当含量的磷元素,解决用机械破碎法制备Fe-6.5Si软磁合金粉末的难题.分别采用普通球磨、环锤磨和六角球磨等工艺实验方法进行制备Fe-6.5Si软磁合金粉末研究.结果表明,在同等条件下,六角球磨工艺方法的制粉效率较高,粉末形貌特征和电磁性能均较佳.     

Fe-6.5Si合金过喷粉末特性研究

以喷射成形Fe-6.5Si过喷粉末为研究对象,采用OM、XRD、VSM、TEM等手段研究了不同球磨工艺条件下所得合金粉末的组织形貌及微观结构对软磁性能的影响,据此找到较佳的球磨工艺条件.结果表明:Fe-6.5Si合金过喷粉末在366 r·min~(-1)下球磨24 h后,平均晶粒尺寸为25.9 nm.球磨后粉末的磁性能受残余应力和晶粒尺寸的共同影响,在366r·min~(-1)下球磨18 h获得了最佳的磁性能,其饱和磁化强度为205.37 emu·g~(-1),矫顽力为30.096 Oe.     

薄带连铸Fe-36Ni合金组织织构演变与性能研究

以Fe-36Ni合金为研究对象,将短流程薄带连铸技术引入其生产过程.利用OM、显微硬度仪和XRD等检测手段研究了薄带连铸Fe-36Ni合金全流程组织演变情况,并探讨了不同热处理工艺下Fe-36Ni合金薄带的力学性能和磁性能.结果表明,薄带连铸Fe-36Ni合金的凝固组织较常规流程的凝固组织明显细化.冷轧板在750℃退火后再结晶趋于完全.在800℃退火后晶粒分布较为均匀,晶粒尺寸～30μm,该退火温度下,合金的力学性能最优,抗拉强度达到438 MPa,延伸率达到30.8%,综合力学性能满足使用要求.冷轧板退火后,再结晶晶粒取向主要集中在100//ND方向,表现为强λ织构,从而使其具备较低的高频铁芯损耗和较高的磁感应强度.磁性能在900℃退火后达到最好,磁感应强度B_(50)达到1.282 T,铁芯损耗P_(15/50)低至2.04 W/kg,满足工业产品的要求.该研究为Fe-36Ni合金的短流程制备提供了一定的参考.     

还原铁粉对Fe-1.1Ni-0.5Mo-0.5Cr合金组织与性能的影响

在惰性气体雾化法制备的Fe-1.1Ni-0.5Mo-0.5Cr预合金粉末中添加1.5％的Cu粉和0.6％的C粉(均为质量分数)以及还原铁粉(添加量分别为0、10％、20％和30％),混合均匀后在600 MPa压力下模压,在1 180℃烧结1h.烧结合金经180℃/1h回火处理后,进行密度、硬度、拉伸力学性能检测以及显微...     

冷轧辊表面毛化技术现状与进展

简述了几种新的冷轧辊表面毛化方法，比较种种毛化方法的工艺特性，同时介绍了冷轧辊表面毛化技术的国内外发展现状以及宝钢在轧辊毛化技术方面试验研究的进状况，最后提出几点看法。     

血清胱抑素C、内生肌酐清除率及尿微量白蛋白在恶性肿瘤含顺铂化疗患者肾功能评价中的地位

Objective: Chemotherapy drugs such as platinum may cause damage to the renal function, creatinine clearance (Ccr), as a "golden standard" indicator in clinical evaluation of renal function, was limited in application due to complicated detection steps. By detecting the expression of serum Cystatin C (Cys C), Ccr and urinary micro-albumin (UMA), this study was designed to analyze and discuss their roles and status in renal function evaluation for cancer patients before and after chemotherapy with platinum. Methods: We retrospectively reviewed 110 patients who receiving platinum-containing protocols or non-platinum-containing ones, and got the expression of Cys C, Ccr (was calculated by Cockcroft-Gault equation) and UMA, then analyzed whether there were differences for Cys C,Ccr and UMA in those patients; for patients with mildly impaired renal function (Ccr between 50–75 mL/min), whether there were differences for Cys C and UMA before and after chemotherapy with platinum. Results: There was statistical significance for Ccr, Cys C and UMA in patients who receiving platinum-containing protocols (85.01 ± 28.40) vs (76.79 ± 26.63) mL/min, (1.49 ± 0.50) vs (1.80 ± 0.84) mg/L and (14.30 ± 9.15) vs (16.90 ± 10.95) mg/L, P = 0.00, 0.00 and 0.01), and no statistical significance for those receiving non-platinum-containing ones (89.45 ± 29.69) vs (86.78 ± 27.96) mL/min, (1.51 ± 0.78) vs (1.63 ± 0.73)mg/L and (17.31 ± 10.46) vs (16.59 ± 8.33) mg/L, P = 0.45, 0.07 and 0.57); and there were also significant differences for Cys C for patients with mildly impaired renal function before and after chemotherapy (1.68 ± 0.55) vs (2.04 ± 0.68) mg/L, P = 0.03), while no statistical significance for UMA for the same ones (21.11 ± 10.06) vs (21.22 ± 8.81) mg/L, P = 0.93). There were statistical significance both for Cys C and UMA before and after chemotherapy in platinum-containing group, but the AUC for Ccr and Cys C is greater than that for UMA (P < 0.02). Conclusion: Cys C and UMA can both access renal dysfunction early after chemotherapy, but Cys C is more sensitive than UMA in reflecting early renal dysfunction, so Cys C can replace Ccr and become a reliable indicator in the assessment of renal function for cancer patients before and after chemotherapy especially with platinum.     

行星轧机的发展及取得的最新成果

介绍了行星轧机在国内外的发展情况及取得的最新成果。着重分析了常规双行星辊轧机和单行星辊轧机存在的问题。针对这些问题，提出了一种新结构的行星轧机，即复合式行星轧机。经在自制的实验用简易复合式行星轧机上实验表明，该轧机是可行的，不仅适用于薄板坯连铸连轧，而且对改造目前现存的行星轧机也有一定的实用价值。     

Online mechanical property prediction system for hot rolled IF steel

Abstract

Traditionally, mechanical property estimation is carried out by destructive testing, which is costly and time consuming. Sometimes, the time schedule in the mill is so tight that coils are dispatched, while the samples are still under investigation; thus, knowledge of the strip quality immediately after rolling without mechanical testing can save a lot of time and money. As the rolling process is complex and final mechanical properties of steel depend on many parameters, it is almost impossible to develop an accurate first principle based mathematical model, so an artificial neural network based model to predict the mechanical properties of hot rolled steel strip has been developed. This paper describes the neural network based online system that helps in predicting mechanical properties of interstitial free (IF) steel strip and also elaborates how this models can help in capturing various metallurgical phenomena during rolling.     

5-Br-PADAP-TritonX-100光度法连续测定铜和锰

研究了非离子型表面活性剂TritonX 1 0 0存在下 ,用 5 Br PADAP光度法联合测定铜和锰的方法。结果表明 :在 pH 9 0的硼砂缓冲介质中 ,5 Br PADAP与铜 (锰 )生成紫红色络合物 ,λmax=575nm ,ε575=1 0 4× 1 0 5。铜量在 0～ 1 4μg/2 5mL(锰量在 0～ 1 0 μg/2 5mL)的范围内符合比尔定律。实测了钢样中铜和锰的含量 ,结果令人满意。     

The effects of strength ratio on the forming limit diagram of tailor-welded blanks

In the present study, the influences of strength ratio (SR) are studied on the formability and forming limit diagram (FLD) of tailor-welded blanks (TWBs). AISI 340, St 12 and St 14 steel sheets with equal thickness of 1?mm were used as different kinds of steel to make TWB with different SR. TWBs were obtained by CO₂ laser welding of different steel sheets. Limit strength ratio (LSR) is introduced as a new useful factor to predict the FLD of TWB with different SR. Results of this research show that with increasing of difference of TWB’s SR and LSR, formability and the level of FLD will decrease. By SR increasing, limit dome height decreases and some defects such as weld line movement increase. The experimental findings show that the SR of TWB can effect on the position of fracture in the TWB products.     

本钢2300mm热轧AWC控制简析

全面、系统地对本钢2300mm带钢热连轧生产工艺过程中,带钢宽度控制的起因以及影响最终产品宽度的要素进行了介绍,并对当前使用的自动宽度控制系统的设计进行了介绍,给出了控制系统原理图、可实现的程序框图及控制策略应用。结果表明,该方法能有效地控制产品宽度。     

PbCl_2在不同盐酸浓度、Sb~(3 )浓度和温度条件下溶解度的研究

针对锑白生产过程中产品含铅高这一问题 ,用化学纯试剂研究了PbCl2 在不同盐酸浓度、Sb3 浓度和温度条件下的溶解度。     

面向对象的约束满足方法在钢铁企业调度系统中的应用

综合考虑钢铁企业调度问题的特点,利用面向对象的设计模式,提出了基于约束满足方法的冶、铸、轧一体化生产调度方法。该方法以解决工序间的衔接问题为重点,沿袭了面向对象模式的特点和优势,在系统的可扩充性和可维护性上显示了较优的性能。