冷轧压下率对铁素体区热轧Ti-IF钢冷轧板深冲性能的影响

研究了于铁素体区润滑热轧的Ti-IF钢在随后的冷轧及退火工艺中深冲性能的变化.结果表明,在冷轧压下率为75 %时IF钢所获得的r值最高.织构分析表明,于铁素体区润滑热轧的IF钢具有较强的{111}∥ND再结晶织构组分;冷轧时采用75 %的压下率和随后的退火工艺可获得最强的{111}∥ND再结晶织构;冷轧压下率进一步增加时,{111}∥ND再结晶织构将会削弱.这种织构变化与冷轧时ND纤维晶粒内部的剪切带变化有关.     

冷轧压下率对无抑制剂取向硅钢初次再结晶退火的影响

对无抑制剂取向硅钢不同压下率下初次再结晶退火后的显微组织、宏观织构和微观织构进行了研究.结果表明,冷轧板织构主要为α取向线{001}＜110＞、{112}＜110＞和{111}＜110＞织构以及γ取向线{111}＜110＞织构.初次再结晶退火后,α取向线织构减弱,织构主要为γ取向线{111}＜112＞织构.随冷轧压下率的增加,冷轧和初次再结晶织构强度增加.当压下率为88％时,初次再结晶退火后 Goss 织构和{111}＜112＞织构强度最高,最有利于发生二次再结晶.EBSD 分析显示,Goss 取向晶粒大多与{111}＜112＞取向晶粒相邻.提高冷轧压下率,Goss取向晶粒和{111}＜112＞取向晶粒都增加,Goss 取向晶粒偏离理想取向角度减少.     

冷轧压下率对DQ级深冲带钢组织和性能的影响

研究了60%～80%冷轧压下率对3.5 mm CSP热轧板轧制的1.4～0.7 mm冷轧深冲带钢力学性能、组织和织构的影响。结果表明,随冷轧压下率由60%提高至80%,冷轧带钢的再结晶开始温度由560℃降至520℃,成品带钢组织细化;当冷轧压下率为74.3%时,成品DQ级带钢的深冲性能最佳。随冷轧压下率提高,成品深冲带钢△r值逐渐减小,这与成品带钢中{112}〈110〉织构取向函数值f(g)升高有关。     

冷轧压下率对IF钢组织织构和性能的影响

以工业生产的热轧板为原料,研究了冷轧压下率对罩式退火后的Ti-IF钢和Ti＋Nb-IF钢组织织构和性能的影响。研究结果表明,经罩式退火后,两种IF钢再结晶基本完成,晶粒呈饼状;随着压下率的增加,晶粒尺寸变小;应变硬化指数n90°值逐渐降低。Ti＋Nb-IF钢塑性应变比r90°值在碳含量较高、压下率为70%,或碳含量较低、压下率为80%时,达到最大值;Ti-IF钢塑性应变比r90°值在压下率70%时,达到最大值。随着冷轧压下率的加大,IF钢的织构也越强,并且织构从较低冷轧压下率时的{223}〈110〉、{114}〈110〉和{111}织构变为较高压下率时的{223}〈110〉、{111}〈110〉和{114}〈110〉织构,织构类型有向{111}织构靠拢的趋势。     

冷轧压下率对含磷深冲钢板织构及深冲性能的影响

利用ODF技术及织构定量技术详细分析了含磷深冲钢板的形变织构和再结晶织构,探讨了冷轧压下率(ε)对钢板织构和深冲性能(r_m,△r)的影响,结果表明,磷钢随着ε的增加,再结晶织构中{111}<112>(包括{554}<225>)织构组分的体积百分比含量增加,同时轧向在晶体学空间的分布更加漫散,从而导致r_m值提高而△r值降低。     

0.02%C钢深冲板St15再结晶退火织构演变的模拟

用二维元胞自动机方法 ,以 0 .0 2 %C铝镇静钢深冲板St15热轧、冷轧、退火再结晶组织和织构以及再结晶演变的实验结果为初始条件和参照 ,分别对 1.2mm冷轧深冲板 5 6 0～ 6 2 0℃退火再结晶和 70 0℃晶粒长大过程进行计算机模拟。得出 ,冷轧深冲板 5 6 0～ 6 2 0℃加热 12 0min再结晶完成 ,平均再结晶晶粒为 6μm ,再于 70 0℃加热 10h ,晶粒长大尺寸和织构趋于稳定 ,平均晶粒尺寸为 34μm ,织构以有利织构组分 { 111}〈110〉和 { 111}〈112〉织构为主。模拟结果与实验数据相符     

IF钢铁素体区热轧工艺参数对深冲性能的影响

 采用润滑轧制,在不同压下率、终轧温度及退火制度下,研究了IF钢铁素体区热轧时,不同工艺参数对IF钢深冲性能的影响。结果表明：在实验范围内,随压下率增加,r值提高;终轧温度下降,r值略微增加;高温退火可使变形铁素体充分再结晶,从而提高r值。ODF织构分析结果与检测结果是一致的。     

冷轧压下率对CSP流程SPCC钢板退火组织和织构的影响

采用某钢厂生产的低碳铝镇静钢进行了CSP流程SPCC钢板不同冷轧压下率的工业试验,研究了退火过程中冷轧压下率对冷轧钢板组织性能的影响规律。结果表明：对于碳含量为0．043％的低碳铝镇静钢,试验条件下冷轧压下率对其力学性能和n影响不明显,对r影响则非常显著;冷轧压下率为75％时,可获得最大rm,综合力学性能也达到最佳;△r则随冷轧压下率的提高而单调减小;铁素体晶粒饼形度随冷轧压下率的提高而增加;冷轧压下率为75％时,{111}织构的强度明显高于冷轧压下率为60％时的对应值。     

轧制条件对冷轧无取向硅钢织构的影响

除钢质的纯净度、夹杂物聚集程度、再结晶组织外 ,织构分布和各组分强度对冷轧无取向硅钢的磁性能 磁感应强度和铁损亦具有显著的影响。从基础理论方面讨论了冷轧无取向硅钢的热轧、终轧温度和层流冷却条件对轧件织构形成的影响及冷轧压下率和冷轧轧制形状参数对其再结晶织构的影响.     

冷轧压下率对Hi-B钢初次再结晶织构的影响

研究模拟CSP工艺试制Hi-B钢在不同冷轧压下率(73%、78%、83%、88%及93%)下对其初次再结晶退火(850℃,5 min)后织构的影响。使用Zeiss Axioplan金相显微镜观察组织,借助NOVA400 Nano SEM型场发射扫描电子显微镜进行微观织构EBSD(电子背散射技术)数据采集,利用二次萃取复型法制样并通过JEM-2100透射电子显微镜(TEM)及能谱仪(EDS)观察压下率为88%的初次再结晶样品中抑制剂析出情况。结果表明:Hi-B钢冷轧的最合适压下率约为88%,冷轧初次再结晶退火(850℃,5 min)后晶粒细小,组织良好,有一定的Goss晶粒,有利的{111}112织构含量较高和较多的∑9、∑3、∑5有利CSL晶界。抑制剂(主要为Cu2S)析出较多,平均尺寸大小约为50.15 nm,平均面分布密度约为1.54×109个/cm2。     

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.     

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.     

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。