(110)[110]Fe-Si单晶体的冷轧和再结晶

研究了(110)[110]Fe-Si单晶体的冷轧和再结晶。经过70—90%冷轧后,得到了强的{111}〈110〉和弱的{111}〈112〉加工织构,退火后得到了集中的{111}〈112〉再结晶织构。冷轧变形后,{111}〈112〉取向的地区比{111}〈110〉取向的地区先发生回复,{111}〈112〉取向的亚晶吞并滞后回复的地区而长大,成为再结晶晶核。这种再结晶织构的形成过程,可以概括地称为同位成核-选择生长。     

形变诱导Inconel 625合金管材的静态再结晶行为（英文）

通过室温压缩变形与再结晶退火处理研究了Inconel625高温合金冷变形及再结晶行为,采用EBSD技术分析冷变形过程中的应变分布、晶粒尺寸变化、组织与织构演变,以及冷变形Inconel625合金再结晶过程中再结晶分数、晶粒尺寸、组织及织构演变。结果表明,Inconel625合金在变形量为35%～65%时具有良好的塑性,随着变形量的增加,晶粒尺寸减小,应变分布越均匀,{111}112织构和{110}001织构逐渐减弱,而{001}110织构和{112}111织构略为增强。冷变形Inconel625合金经再结晶退火处理后,随着退火温度升高与保温时间的延长,再结晶分数增大;随着变形量的增大,Inconel 625合金发生完全再结晶时的温度降低,且发生完全再结晶时的晶粒尺寸变小,变形量为35%时,再结晶过程主要是{112}111织构和{123}634织构转变为{110}112织构、{001}100织构与{124}211织构。随着变形量增加到50%及65%时,冷变形产生的{123}634织构在再结晶过程中转变成了{124}211织构。     

冷轧板再结晶退火中组织和织构演变的研究

薄板坯连铸连轧(CSP)热轧板料经热处理来适当调整组织后进行冷轧及退火,并运用电子背散射衍射(EBSD)技术研究了再结晶退火中组织和织构的演变.结果表明:发生再结晶的温度范围是530℃～590℃,590℃为完全再结晶温度;再结晶发生时冷轧变形基体和新晶粒取向的晶界角度差大约为25°～55°;{111}〈110〉、{111}〈112〉取向在再结晶初期和中期发生很大的变化,而{001}〈110〉、{112}〈110〉取向在再结晶后期才发生很大的变化;EBSD检测的结果分析可得{001}〈110〉、{112}〈110〉、{111}面取向储存的变形能依次增加.     

取向硅钢初次再结晶组织结构的研究

研究了取向硅钢在初次再结晶过程中的组织和结构变化,包括晶粒长大情况、取向差、重合位置点阵(CSL)及织构的变化。研究表明,820℃盐浴再结晶退火3 s时即完成再结晶,随即发生晶粒长大。在初次再结晶的开始阶段,主要织构是{111}112、{100}110和弱的高斯织构;随着退火时间增加,{100}110织构和高斯织构逐渐减弱,{111}112织构先增强后减弱,并向{111}110和{111}231转化,退火3 min以后出现的{012}001织构是一种促进二次再结晶发展并最终有利于提高二次再结晶磁感和降低铁损的织构。退火时间增加到3 min以后,CSL的∑3晶界比例增加。退火时间增加到30 min时,CSL的∑1晶界比例增加,同时,小角度晶界比例提高,大角度晶界减少。     

CGO硅钢各阶段织构遗传继承性的EBSD分析

利用EBSD技术对CGO硅钢热轧、中间退火、脱碳退火及二次再结晶退火组织及织构进行分析,研究了CGO硅钢各阶段加工制备过程中高斯{110}001晶粒的形状、尺寸及分布特点,分析了高斯取向晶粒在各工序过程中的遗传继承性特点。结果表明,CGO硅钢热轧板的次表层存在Goss取向晶粒,历经一次冷轧及中间退火后Goss取向晶粒基本消失,一次再结晶之后Goss织构仍不是主要织构,主要织构为{111}110和{111}112,说明Goss取向晶粒在二次再结晶退火前数量及尺寸上并不占优势,二次再结晶过程中Goss取向晶粒异常长大形成锋锐Goss织构。{111}110和{111}112织构组分的强度在一次冷轧中不断增加,{111}112织构组分的强度在二次冷轧后达到最大而{111}110织构组分是在初次再结晶后变强。     

湿H2气氛下CGO硅钢初次再结晶织构演变行为

通过对湿H2气氛下,相同退火温度、不同退火时间的CGO硅钢初次再结晶样品进行金相组织观察,并进行了EBSD微观织构分析,研究了CGO硅钢初次再结晶过程中的组织及再结晶织构演变行为。结果表明,在湿H2气氛下,820℃保温,CGO硅钢初次再结晶过程约在120 s时完成。随着退火时间的延长,γ面上{111}<112>织构含量逐渐减少,{111}<110>织构先减少后增多,随着再结晶的完成,部分{111}<112>取向晶粒向高斯{110}<001>取向转化的同时,也向{111}<110>取向转化,高斯{110}<001>织构含量逐渐增多。高斯取向晶粒较多是由{111}<112>取向晶粒转化而来,同时也证明了CGO硅钢高斯取向晶粒的二次再结晶异常长大生长机制为择优形核。     

形变诱导Inconel 625合金管材静态再结晶行为

使用室温压缩变形与再结晶退火处理研究了Inconel 625高温合金冷变形及再结晶行为,采用EBSD技术分析冷变形过程中的应变分布、晶粒尺寸变化、组织与织构演变,分析冷变形Inconel 625合金再结晶过程中再结晶分数、晶粒尺寸、组织及织构演变。研究表明,Inconel 625合金在变形量为35%~65%时具有良好的塑性,随着变形量的增加,晶粒尺寸减小,应变分布越均匀,{111}<112>织构和{110}<001>织构逐渐减弱,而{001}<110>织构和{112}<111>织构略为增强。冷变形Inconel 625合金再结晶退火处理后,随着退火温度与保温时间的升高,再结晶分数增大;随着变形量的增大,Inconel 625合金发生完全再结晶时温度减小,且发生完全再结晶时的晶粒尺寸变小,变形量为35%时,再结晶过程主要是{112}<111>织构{123}<634>变形织构转变为{110}<112>织构、{001}<100>织构与{124}<211>织构。随着变形量增加到50%及65%时,冷变形产生的{123}<634>织构在再结晶过程中转变成了{124}<211>织构。     

冷轧压下率对连续退火Ti-IF钢组织和深冲性能的影响

以工业生产的Ti-IF钢热轧板为研究材料,结合连续热镀锌线的工艺特点,采用实验室冷轧、盐浴退火方法和金相、X射线织构测试和力学性能检测等分析手段,研究了冷轧压下率对组织、织构和深冲性能的影响规律。试验结果表明,随着冷轧压下率从60%提高到90%,冷轧态α取向线上的取向密度不断增强,主要形成了{223}〈110〉和{114}〈110〉织构,γ取向线上的{111}〈011〉和{111}〈112〉织构亦有所增强;退火后铁素体晶粒尺寸从9.0级细化到10.5级,导致强度(特别是屈服强度)有所增加,η_(90°)值有所降低。试验钢退火后仍具有较强的{223}〈110〉和{114}〈110〉织构,此外,随着冷轧压下率从60%提高到80%,{111}〈110〉和{111}〈112〉织构有增强的趋势,且{111}〈110〉织构比{111}〈112〉织构强,r_(90°)值有所提高;当冷轧压下率进一步提高到90%时,{111}〈112〉织构明显增强,但{111}〈110〉织构变化较小,导致{111}〈112〉织构比{111}〈110〉织构强,使r_(90°)值反而有所降低,这与γ织构分布变化导致制耳分布曲线由典型的4制耳特征转变为6制耳特征有关。     

无取向硅钢退火织构的演变与磁性能关系的研究

运用取向分布函数(ODF)分析了50W600电工钢不同退火工艺退火织构的演变及织构对电磁性能的影响,利用织构数据计算了无取向硅钢的磁晶各向异性能.研究表明,较高的退火温度或较长的保温时间,再结晶织构α线的取向密度下降,{100}〈011〉和{211}〈011〉取向密度急剧降低,γ线{111}〈112〉密度显著增加,晶粒取向绝大多数聚集在γ线{111}〈112〉取向附近;低温退火有助于提高无取向硅钢有利织构{100}〈UVW〉的占有率.磁晶各向异性能计算结果表明无取向硅钢也存在磁各向异性.     

脱碳退火保温时间对含铌低温取向硅钢初次再结晶的影响

取向硅钢初次再结晶的组织、织构对二次再结晶过程中形成锋锐的高斯织构至关重要。利用OM与EBSD技术,对脱碳退火不同保温时间下各试样初次再结晶组织、织构和晶界的形成规律进行了研究。结果表明:采用850℃保温5 min的脱碳退火工艺,得到的初次再结晶晶粒最为均匀细小,对后续过程中形成高取向的Goss织构有利;经脱碳退火后各试样中织构主要以{111}112、{411}148织构为主,随退火时间的延长,{111}112织构先增强后减弱,{111}110织构逐渐增强;当脱碳退火保温时间为5 min时,高能晶界及大角晶界所占比例最高,在二次再结晶时有较高迁移速率,有助于最终获得锋锐的Goss织构。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

Effect of Short-Time Aging on the Pitting Corrosion Behavior of a Novel Lean Duplex Stainless Steel 2002

The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel(LDSS) 2002 was investigated through the potentiostatic critical pitting temperature(CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm~2 compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr_2N and M_(23)C_6 along the ferrite–austenite grain boundaries.     

Information for Contributors

正The Transactions of Nonferrous Metals Society of China,founded in 1991 and sponsored by The Nonferrous Metals Society of China,is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology,including mineral processing,extraction metallurgy,metallic materials and heat treatments,metal working,physical metallurgy,powder metallurgy,with the emphasis     

Preface

<正>We are pleased to present this Special Issue of Transactions of Nonferrous Metals Society of China containing selected papers from the First Asian Conference on Aluminum Alloys(ACAA-2013),held in Beijing,China,13–17 October 2013.This conference has been initiated,with approval of     

Information for Contributors

The Transactions of Nonferrous Metals Society of China, founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, 1NSPEC, CA, METADEX, AJ and JICST.