不锈钢爆炸复合板的性能及其复层结构的研究

研究了不锈钢爆炸复合板的机械性能，耐腐蚀性能以及复层ＳＵＳ３２１不锈钢的残余组织结构，结果表明试验得到的不锈钢爆炸复合板结构强度高，机械性能良好，ＳＵＳ３２１不锈钢复层经爆炸复合以后产生了大量的位错，层错和孪晶，引起一定的硬化，但并不影响其耐晶间腐蚀性能。     

高碳奥氏体不锈钢/钢复合板热处理工艺探讨

304(316)/Q345R复合板主要用于制造耐酸环境的压力容器,通过不同的热处理温度对爆炸焊接后的复合板进行各项性能检验结果对比,得出不锈钢/钢复合板的最佳热处理工艺为正火工艺,在此温度下不仅能够最大程度消除爆炸复合后的残余应力,优化复合板机械性能,而且能够避开奥氏体不锈钢450℃~850℃的敏化温度区间,保证晶间腐蚀性能,同时复合板其它性能检验也能达到要求。     

0Cr18Ni9不锈钢复合板复层缺陷修复技术

通过不同的手工电弧焊焊接工艺修补不锈钢复合板复层缺陷,并对修复的复合板进行化学成分、力学性能、显微硬度、金相组织、能谱等检测分析,结果表明,过渡层用309焊条、复层用308焊条、分两层修补的焊接工艺二修复的缺陷区,其力学性能及耐腐蚀性能满足复合板母材性能要求。     

NKK研究出耐海水腐蚀的复层不锈钢

NKK已研制出耐海水腐蚀性能好的第一块不锈钢复层板。过去普遍使用的SUS304、SUS316钢耐海水腐蚀性差,而其他产品如高Ni-Cr ASTMA240 S31254钢,虽然耐海水腐蚀,但是价格高。最初,在制造耐海水不锈钢复层板时,由于在包覆过程中不锈钢易于活化,而造成耐腐蚀性明显降低。通过添加特殊元素以及使Cr(25%)、Ni(22%)、Mo(4.5%)的不锈钢可加工性大大提高,因而耐腐蚀性能明显改善。     

热轧不锈钢复合板力学性能及工艺优化

研究了热轧不锈钢复合板的力学性能及工艺优化。借助显微组织观察技术及热模拟技术对复合板复层塑性恶化的原因及不锈钢再结晶行为进行了研究,并结合研究结果,通过再热处理进行了工艺优化。结果表明,低温终轧使得复层产生明显的加工硬化是导致不锈钢复层塑性恶化的主要原因,通过适当温度的再热处理可以明显改善复层的塑性,获得理想的强塑性匹配。     

爆炸处理消除焊接残余应力[1] 对SUS321不锈钢组织结构的影响

研究了SUS321不锈钢经爆炸处理消除焊接残余应力后的残余组织与结构,发现低倍组织几乎没有什么变化,而在亚结构方面产生大量的位错、层错、孪晶,并伴有少量的ε-马氏体生成。     

镍—不锈钢爆炸复合板的轧制

本文介绍了镍—不锈钢爆炸复合板的轧制过程和检验结果。指出,用本文提供的工艺参数,可获得良好组织、性能、一定面积和小厚度的复合板。统计表明,轧制后,镍和不锈钢层的厚度比基本不变。检验表明,该轧制态复合板主要力学性能与对应状态下不锈钢的相当。实践证明,爆炸焊接与轧制的联合是制造大面积复合板、提高生产效率和获取更多经济效益的必经之路,也是研究爆炸焊接理论和实践的重要依据。     

超纯铁素体不锈钢爆炸复合板退火工艺研究

以超纯铁素体不锈钢复合板SUS445J2+Q245R为例,通过实验和分析,确定最佳的退火工艺。实验证明:退火温度过高会导致SUS445J2不锈钢晶粒长大、组织不均匀,温度过低或者冷却速度过慢,则会产生σ脆性和475℃脆性;SUS445J2+Q245R复合板最佳的退火温度为870℃,保温后快速冷却。     

低温多效海水淡化不锈钢的腐蚀实验研究

从腐蚀机理出发,分析各类不锈钢特点,并从中选出性能最优复合板复层板材不锈钢。通过具体实际多工况条件,分析选择最适宜的腐蚀检测方法,讨论实验模拟过程中影响金属腐蚀的干扰因素及新开发板材优势。新开发复合板板材,基材与复材各施其能,用于MED,将会给于复合板的科研和工程应用突破性的进展。     

TMCP工艺轧制桥梁用不锈钢复合板的组织与性能

为了获得桥梁用不锈钢复合板良好的综合性能,采用控轧控冷(thermal mechanical control process,简称TMCP)工艺轧制了桥梁用不锈钢复合板316L+Q370qD,利用金相、扫描、拉伸、冲击、弯曲、剪切和晶间腐蚀等手段研究了该复合板的组织与性能。结果表明,316L+Q370qD桥梁用不锈钢复合板的界面实现了完全冶金结合,未发现孔洞、裂纹等缺陷以及大颗粒的析出物及氧化物夹杂等;复合板的屈服强度为421~446MPa,伸长率为24.0%~28.0%,-20℃纵向冲击吸收能量平均值为200J,180°内、外弯曲合格,平均剪切强度为412 MPa,复合板的各项力学性能均满足GB/T 8165—2008《不锈钢复合钢板和钢带》标准要求。按照GB/T 4334—2008方法 E进行晶间腐蚀试验,复层不锈钢316L未出现晶间腐蚀现象,具有良好的耐晶间腐蚀性能。     

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。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

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。     

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.