EH32高强度船板钢实验室研究与分析

在实验室研究了TMCP控轧控冷工艺及正火处理对EH32高强度船板用钢显微组织和力学性能的影响;通过对组织和性能分析,制定了合理的实验室EH32船板钢生产工艺,并为工业生产提供指导。结果表明,采用TMCP工艺生产薄规格EH32船板时能获得理想的组织和性能,采用正火处理的厚规格船板具有良好的低温韧性,弥补了TMCP工艺生产厚规格低温冲击韧性及时效冲击韧性值不足的问题。     

高强度船板抗应变时效敏感性研究

采用夏比冲击法测定了热轧、热轧+正火及TMCP 3种工艺下EH36高强度船板的应变时效敏感性,通过金相显微镜、透射电镜等观察了显微组织、精细结构和二相粒子析出形貌。结果表明,TMCP工艺下所获得的细化的F+P显微组织和大量细小弥散析出的二相粒子,减少了碳、氮间隙原子固溶,并阻碍了它们的扩散,使高强船板具有优良的低温韧性和抗应变时效敏感性。     

低碳型EH36高强韧性船板钢开发生产

通过合理的成分、工艺设计及优化,在济钢3 500 mm中厚板轧机上成功研制出低碳型EH36高强韧性船板。轧后钢板的力学性能、金相组织分析表明,TMCP工艺优化后生产船板的性能指标满足国标和船级社船规要求,具有良好的强韧性匹配,可以替代中碳+轧后热处理正火的工艺路线,实现EH36船板钢的低成本、低能耗、短流程生产。     

正火后控冷工艺在厚规格船板开发中的应用

 采用正火工艺与控制冷却相结合的“正火控冷工艺”,奥氏体化温度与一般正火温度相同,正火后进行水冷,得到更细小的铁素体+珠光体组织。针对120mm E36船板钢的开发进行了试验研究,正火后利用淬火机“弱水冷”模式进行水冷,终冷温度600~650℃。与传统正火后空冷相比,塑性未降低,强度提高约15MPa,低温韧性良好,特别是心部-60℃冲击功大于100J,获得了更为细小均匀的铁素体+珠光体组织,各项性能满足E36船板标准要求,对特厚船板的开发具有重要意义。     

核压力容器用SA508Gr.4N钢组织遗传性的消除

采用可控速热处理炉对核压力容器用SA508Gr.4N钢消除组织遗传性现象进行研究。为模仿大锻件锻后不同位置晶粒尺寸差异较大现象,对试验钢进行不同温度预粗化处理。设计了A和B两种方案消除试验钢的组织遗传性,结果表明:经方案A即等温退火+亚温正火+正火处理后,得到细小且均匀的晶粒,晶粒等级由2~9级细化为7.5~8.0级,该方案可有效消除SA508Gr.4N钢的组织遗传性现象。观察了等温退火、亚温正火和高温回火后试验钢组织的变化,分析了微观组织变化对消除试验钢组织遗传性的影响。     

EH36级船板钢生产实践

介绍了唐钢中厚板公司EH36级船板钢的生产工艺、过程控制和生产情况,分析了产品质量状况.生产表明,通过LD-LF-CC工艺流程生产EH36级船板钢,从成分设计到工艺过程控制均比较合理,实际操作和过程控制稳定,铸坯质量良好,满足了用户要求.     

EH36高强度船体结构钢板的研制与开发

采用低碳高Mn、Nb微合金化进行了EH36高强度船板成分设计,采用TMCP工艺在天钢3500mm中厚板轧机上成功研制出EH36高强船板。对轧后钢板的力学性能、显微组织进行检测分析,结果表明,研制开发的EH36高强度船体结构钢板的性能满足国标和船级社船规要求,具有良好的强韧性配合。     

厚规格高强度E36船板的开发

介绍了韶钢厚规格E36船板开发情况,采用Nb、Ti、Ni微合金化的成分设计,结合洁净钢的冶炼以及合理的轧制冷却工艺,配合正火热处理工艺,结果显示,正火处理后的钢板,从表面至心部组织均匀,晶粒度达到了9.5级,产品力学性能完全符合九国船级社船规要求,表明韶钢成功开发了以正火状态交货的60mm厚E36-Z35船板.     

正火工艺对A537 CL.1性能与组织的影响

采用不同的正火工艺对热轧A537CL.1试样进行系列热处理试验,利用常温拉伸试验机、摆锤式冲击试验机、金相显微镜研究热处理工艺对试验钢组织性能的影响,结果表明:热轧钢板正火后强度降低,钢板出炉后风冷与空冷相比,风冷钢板强度略有提高,但冲击值降低;在880℃保温、保温时间36 min的正火工艺条件下,试验钢综合性能优良,满足LPG低温储罐用钢的要求.     

海洋平台用钢种EH36的生产实践

EH36为高强船板用钢,具有优良的低温冲击韧性和焊接性能,被广泛用于制造大型海洋平台.因EH36高强船板钢特殊的性能和使用环境,所以对其质量要求非常严格.以某钢厂生产EH36高强船板钢为例,本文介绍了EH36高强船板钢的炼钢生产工艺,提出了炼钢生产过程中的重点控制技术内容.通过生产条件准备、铁水预处理、转炉冶炼工艺、精...     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.