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综合分析高强度预应力钢绞线盘条的质量控制因素,讨论SWRH82B的化学成分、轧后控冷工艺、金相组织以及索氏体片间距等对盘条强度的影响,为SWRH82B盘条化学成分设计提供了依据。 相似文献
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浅析82B盘条断裂现象原因 总被引:1,自引:0,他引:1
针对国产82B盘条在拉拔过程中的断裂现象进行了分析,通过对网状组织、金相组织、夹杂物与表面质量及拉拔工艺的浅析,指出了造成82B盘条断裂的原因。 相似文献
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介绍胎圈钢丝用合金盘条C82DACr的轧制开发过程。通过合理的轧制工艺,盘条获得了较为理想的力学性能和金相组织,其索氏体化率达到85%以上,并对产品后期加工进行跟踪,盘条经客户使用,效果良好。 相似文献
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2002年10月~2003年3月,高线Q235C建筑盘条力学性能出现异常,取样进行化学成分分析及金相组织检验。从金相组织、化学成分方面分析Q235C建筑盘条力学性能反常的原因,为更好地控制高线建筑盘条的产品质量提供参考。 相似文献
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针对昆钢400MPa盘条钢筋生产过程中出现的屈服强度及断后伸长率偏低、同卷盘条力学性能不稳定等问题,取样进行了化学成分、金相显微组织、断口形貌及夹杂物检验分析。结果表明:屈服强度及断后伸长率偏低的主要原因为试样金相显微组织出现8%~30%的粒状贝氏体,粒状贝氏体质量分数30%的试样断口形貌表现为脆性断裂,钢筋塑韧性差;同卷盘条力学性能不稳定的主要原因为冷却速度不同造成金相组织中贝氏体质量分数不同。针对上述情况,炼钢采取出钢全程底吹氩及渣洗工艺,轧钢采取降低精轧及吐丝温度(精轧入口温度控制为870~890℃、吐丝温度控制为840~870℃)、减弱斯太尔摩控冷强度、增加辊道速度等措施,消除了400MPa盘条钢筋性能异常情况。 相似文献
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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。 相似文献
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K Ohta M Nishi M Ueda S Ohyama T Matsubara T Takahashi T Nakajima 《Canadian Metallurgical Quarterly》1998,99(9):589-594
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. 相似文献
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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) 相似文献
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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. 相似文献
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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". 相似文献
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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。 相似文献
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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. 相似文献