4Cr5MoSiV1锻材退火硬度均匀性改进分析

主要针对4Cr5MoSiV1锻材退火硬度不均匀问题进行了分析研究，并对锻材退火设备、操作、工艺等方面进行改进，使4Cr5MoSiV1锻材退火质量得到了有效的改善。     

高速钢钢锭锻前加热工艺研究

高速钢钢锭锻前加热质量对后续的锻造工艺影响至关重要,对M42高速钢钢锭的锻前加热工艺进行了研究。理论计算了M42钢的晶界熔化温度和变形加热温度,结合生产经验设计试验方案,将试样在不同的加热工艺下加热,然后对加热后的组织进行观察分析,从而得出最理想的锻前加热工艺。研究结果表明,M42钢锭最优的高温保温段加热工艺:1 150℃×5 h,为实际生产应用提供理论参考。     

40CrMo大截面锻材内裂探讨

对42CrMo大截面锻材的低倍检验,发现锻材的中心裂纹其实是白点,经采用去氢退火工艺后,白点消除,锻材探伤合格率、成材率明显提高。有电弧炉单炼,钢锭锻造由Φ250以睛的钢材时,去氢退火应是保证钢材内部质量的有效手段。     

Cr12型模具钢成材工艺改进

本文从理论上分析了Cr12型冷作模具钢在加热和锻造过程中客易产生缺陷的原因，并结合其它钢种的联锻工艺特性，对Cr12型冷作模具钢的二火成材工艺进行了改进，改进后的工艺为“两锤联锻、一次成材”。工艺改进后，不但增加了锻材长度和提高了产品实物质量，而且降低了加工步骤费用和缓解了退火压力、为模具钢放量生产起到了显著的作用。     

铸锭加热和锻后热处理工艺对18CrNiMo7-6钢Ф540mm棒材带状的影响

试验18CrNiMo7-6重型齿轮钢(/%:0.165C,0.59Mn,0.24Si,0.006S,0.008P,1.56Ni,1.71Cr,0.28Mo,0.034M,0.0129N)的生产流程为60 t UHP EAF-LF-VD-12.5 t铸锭工艺。试验研究了钢锭加热工艺(1 200~1 220℃,7-8 h~13-15 h),锻材完全退火(900℃12 h,≤80℃/h至650℃50 h,空冷)、等温退火(900℃12 h,空冷至650℃50 h,空冷)和正火(900℃12 h,空冷)工艺对Φ540 mm锻材带状组织的影响。结果表明,钢锭1 200~1 220℃7-8 h加热,锻材经完全退火、等温退火或正火处理后其带状级别分别为4.0,3.5和3.0,钢锭经1 200~1 220℃13-15 h加热,锻材经正火处理后其带状级别为2.5,为最佳工艺。     

成材商品锭质量判定的超声波检测分析与改进措施

应用超声波探伤检测手段,结合高低倍、电子探针等检验方法,找到钢锭锻后成品材超声波探伤检测不合的原因。通过对钢锭冶炼、浇注、冷却制度等工艺的调整,制订出商品锭专用冶炼工艺路线。使得锻比（碳合结钢3.0,高合金钢4.0）得以保证的情况下,商品锭锻后的成品钢材可满足Ⅲ级检测标准要求。     

影响1Cr18Ni9Ti锻材锻造塑性的因素

１Ｃｒ１８ＮｉＴｉ锻材采用非真空感应炉加渣重熔双联工艺冶炼。研究了锻造时产生表面裂纹的几种情况，着重分析了变形方式和加热制度的影响，提出了改善φ５５０ｍｍ，钢锭表面质量的措施；适当控制成分，减少α相数量，过剩Ｃｒ当量控制在〈１１．０范围内，锻造加热温度控制在１２００～１２３０℃适当延长保温时间。     

浅谈提高Cr12钢锻材成材率的探讨

本文围绕Cr12钢锻材成材率的影响因素进行分析并提出了解决的办法和措施，通过对加热、锻造等环节的控制，以达到提高Cr12钢锻材成材率的目的。     

M2高速钢 Φ183 mm锻坯针孔缺陷分析和工艺改进

M2高速钢(/%:0.86C,0.39Si,0.32Mn,0.015P,0.006S,6.00W,4.00Cr,4.80Mo,1.85V)Φ183 mm圆坯由2.0 t电渣锭(Φ500 mm)锻制而成。M2钢锻坯探伤缺陷率为33.33%~69.23%,主要为中心部位针孔缺陷。分析表明,针孔缺陷是钢锭偏析部位在开坯加热和锻制过程中产生过热形成的。通过将电渣重熔电流由8 000→6 800 A降至7 000→6 000 A,降低电渣重熔速度,开锻温度由1070~1090℃降至1030~1060℃,终锻温度由960~980℃C降至900~950℃以降低中间坯的中心温度等工艺措施,使M2钢 Φ183 mm锻坯的探伤缺陷率由50%降低到5.71%。     

718塑料模具钢锻造模块冶炼工艺研究

718模块试制采用EBT+LF+VD+模铸19、36吨大钢锭+红送锻造中心锻造+退火+探伤+调质+探伤检验+入库生产工艺。大钢锭锻造模块718钢冶炼工艺的研究结果表明:控制好化学成分、气体[H]、[O]及非金属夹杂物含量,可使大钢锭的冶金质量达到较高水平。统计数据表明,试制生产的厚度300/600mm塑料模具钢718模块完全可满足用户要求。     

提高竖罐蒸馏工序锌冶炼回收率的途径

通过投入环保收尘设备,强化生产过程控制,提升回收率管理等途径,可将竖罐蒸馏炼锌工序的冶炼回收率由92%提高到96%。     

高炉综合开炉法操作实践

莱钢第一铁厂采用全焦开炉时，开炉过程易产生顽固性悬料，１９９６年１１月２３日１＃高炉第五代采用了综合法开炉。综合法开炉吸取了全焦开炉和木柴开炉的优点，开炉程序简单，技术安全性好，开炉顺利。采用综合法开炉，木柴必须干燥，严格控制风温不大于１５０℃。     

金属中气体元素分析典型案例

金属中气体元素分析已经存在60余年,其检测方法不同于其他化学元素.论文列举5个典型案例(铝中氢、金属中氩、金属中氦、稀土钢中氢、(铝)镁中氧),以进行技术交流和讨论.铝中氢作为金属中气体分析之最难当之无愧,有研究尝试简化铝中氢分析方法,期望像钢样那样快速准确地得到结果,比如应用现有通用的脉冲熔融法反复试验上百次,未能成...     

碳酸盐燃料电池用材料的腐蚀研究与展望

介绍了熔融碳酸盐燃料电池用材抗腐蚀研究的进展,通过对熔融碳酸盐腐蚀机理和Ｎｉ、Ｎｉ－Ｆｅ合金、Ｃｒ以及Ｎｉ－Ａｌ系金属间化合物在熔碳酸盐中的腐蚀行为的分析,认为Ｎｉ－Ａｌ系金属间化合物作为熔融碳酸盐燃料电池的结构材料具有广阔的应用前景。     

Treatment failures in private practice: How do psychologists proceed?

Very little is known about how psychotherapists proceed when patients fail to progress. Psychologists in independent practice (N = 591) were surveyed regarding their approach to treatment failures in an updated partial replication of P. C. Kendall, D. Kipnis, and L. Otto-Salaj (1992). Overall, practitioners reported seeing patients a median of 12 sessions before concluding no progress was being made and relying on colleague consultation and clinical experience to formulate their next steps. Practitioners of different orientations varied on treatment duration and ensuing strategies. Specifically, psychodynamic practitioners treated patients significantly longer than cognitive-behavioral and eclectic practitioners before concluding treatment failure. Cognitive-behavioral and eclectic practitioners were more likely than psychodynamic practitioners to utilize treatment materials informed by psychotherapy outcome research and to refer patients to other clinicians. The ethical and practical implications of handling treatment failures in private practice are considered. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

焦炉炉顶空间温度偏高的原因分析及应对措施

从焦炉结构、装煤量以及装煤后的炉顶空间高度、加热煤气种类、配煤比等影响因素分析了JN-5.5型焦炉炉顶空间溫度偏高的原因。介绍了炉顶空间溫度对炼焦化工产品的影响和降低炉顶空间溫度的措施方法。     

Investigation of personality factors in a Canadian context. II. Standards of decision regarding personality factors in questionnaires.

Responds to commentary by DeYoung, writing from R. B. Cattell's laboratory, which criticized certain aspects of the methodology on which the current authors' substantive discoveries are based (see record 1971-29076-001). In this reply the authors not only have to defend their work on methodological grounds but must also indicate dissatisfaction with the methodology adopted by Cattell (1966). DeYoung points out, very properly, that factor analysts must give greater attention to precision of procedure and presentation. The current authors point out that they used widely accepted procedures, principal components followed by Varimax rotation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

关于降低鼓风炉渣含锌的方法措施分析

在分析鼓风炉炼锌过程中降低鼓风炉渣含锌的方法及其理论依据的基础上,结合东岭集团铅锌冶炼公司鼓风炉炼锌的具体实践,总结并分析了东岭集团铅锌冶炼公司降低鼓风炉渣含锌的具体措施,对提高鼓风炉炼锌的能力和效率具有积极的实践意义。     

A review of programs that promote higher education access for underrepresented students.

This review of the research on college access programs between 1997 and 2007 examines: (a) target populations of students served; (b) assumptions and value judgments of researchers and program staff about participants in connection with participants' diverse backgrounds; and (c) views of access held by college access programs, based on analysis of program practices. Very few research studies were published on college access programs, of which the majority focused on racial and ethnic minority students, and only a few focused on students with disabilities. No programs targeted students from diverse racial/ethnic backgrounds with disabilities, nor did any studies question college access programs' neglect to target or measure outcomes for minority students with disabilities. In addition to these findings, implications are provided for future policies, practices, and research around college access, as well as for higher educational institutions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

某高速线材及大盘卷工程集卷站自动化控制系统

基于西门子S7-400自动化系统,整合了集卷站控制理论和工艺需要的条件下,对集卷站各机械设备的闭环位置控制、顺序联锁控制按工艺流程进行集成,仅就自动化控制思路作出介绍。