济钢Q370qE钢板表面裂纹缺陷原因分析

介绍了济钢Q370qE钢板表面裂纹形成机理,通过金相显微镜、扫描电镜、能谱仪、透射电镜及热模拟试验机等检测手段,分析讨论了钢板表面裂纹产生的原因,并提出了解决措施。     

13MnNiMoR钢板表面裂纹调查与分析

某公司生产的60～90 mm厚度13MnNiMoR钢板表面在粗轧阶段局部产生搓板状横裂纹,通过生产工艺调查、显微组织观察以及能谱分析对钢板裂纹产生原因展开研究。结果表明:连铸坯内部存在原始裂纹,在粗轧阶段不合适的轧制压下规程和高压除鳞水量促使高温钢板表面局部急剧冷却,不协调变形加剧内部裂纹开裂、扩展,形成搓板状横裂纹。据此制定了钢板表面裂纹的预防措施。     

降低高强结构钢板网状裂纹的生产实践

随着济钢一炼钢厂产品结构不断调整,高强结构钢板已成批量生产且级别不断提高,但是高强结构钢板表面网状裂纹逐步成为影响钢板成才率的关键性因素,为了搞清楚钢板表面裂纹的产生阶段和产生原因,济钢一炼钢厂委托技术中心对裂纹钢板进行电镜扫描和能谱分析,得出裂纹是在连铸过程产生的结论.济钢一炼钢厂结合设备现状及工艺情况,对裂纹成因进...     

DB685钢板表面裂纹缺陷原因分析

用金相显微镜和扫描电镜分析方法,对DB685钢板表面裂纹进行分析。结果表明,钢板表面裂纹的形成与稀土氧化物有关。由于钢中稀土氧化物偏析于原奥氏体晶界上,弱化了晶界,造成钢板在轧制过程中产生裂纹。     

钢板表面裂纹成因分析

介绍了钢板表面网状裂纹的形貌特征及微观组织.以E级船板马蜂窝裂纹为例,通过分析钢板裂纹处氧化物圆点及脱碳层程度,判断钢板表面网状裂纹来源,并简述控制方法及实践结果.制定了严格的结晶器使用管理规定,同时着眼点进一步扩大至保护渣及钢水质量、热装制度等,最终彻底消除了钢板表面网状裂纹缺陷.     

Cr-Mo钢板常见表面裂纹原因分析及改进措施

Cr-Mo钢板属贝氏体型合金钢,在空冷条件下产生贝氏体组织.由于制造反应容器用Cr-Mo钢板多为大单重、大厚度截面,容易产生组织应力与热应力,如果在生产过程中控制不当可导致表面裂纹.常见的表面裂纹分为钢锭和来料板坯裂纹、轧前加热裂纹、轧制过程中的拉裂和炸裂、轧后应力裂纹及切割裂纹等,本文对表面裂纹特征及其产生原因进行分析,并提出相应的预防和改进措施.     

红送板坯轧制钢板表面裂纹的原因分析及预防措施

通过扫描电镜对红送板坯轧制钢板裂纹表面进行分析,结果表明裂纹产生于粗轧机轧制过程,提出了降低板坯加热炉出炉温度等措施,实施后红送板坯轧制钢板表面裂纹得到有效控制。     

连铸坯热装热送工艺研究和钢板质量改进措施

本文通过对热送铸坯钢板表面裂纹产生的原因进行分析和研究,发现热送铸坯钢板表面裂纹主要在轧制环节中产生;降低铸坯加热炉温度,减少铸坯加热时间等措施可使热装热送铸坯轧制钢板裂纹得到有效控制。     

钢板头部表面搓板状横裂纹原因分析

介绍钢板表面产生的一种搓板状横裂纹。对裂纹宏、微观特征和显微组织进行了分析,认为这种裂纹的产生与钢板表面局部在奥氏体高温区产生急剧冷却而快速降至两相区(铁素体+奥氏体区),相变析出铁素体有关。由于铁素体的塑性比奥氏体差,在随后的轧制道次中,不协调的形变导致表面裂纹产生。同时,热应力的存在加剧了裂纹的产生与扩展。     

中厚板表面微裂纹成因分析

简要介绍了武钢三炼钢厂生产的连铸坯轧制中厚板钢板表面产生微裂纹的情况 ,并对微裂纹的成因进行了调查和分析 ,根据攻关试验的结果 ,采取了相应的措施 ,基本消除了钢板表面的微裂纹     

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。     

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.     

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。     

Comparison of the results of surgical and conservative treatment of fractures of the diaphysis of the tibia

In this paper is treated the fundamental problematic of the fracture of the diaphysis of the tibia and the therapeutic results after the conservative and operative treatment are confronted. Among 518 patients with 433 open fractures and 35 with closed fractures of the diaphysis of the tibia, successful treatment of more 2/3 was obtained in the period from 1968 to 1972. Following our casuistics and literature, whose results are similar, we find out that the average total treatment of the osteosynthesis of the fracture of the diaphysis was shortened for 2,5 months depending upon the type and the localisation of the fracture. Apolied methods of the operative and conservative and conservative treatment in relation to the velocity of the medical cure as well as to the extreme anatomical-functional results are analised. We noticed that osteosynthesis, made by the intermedullary nail and the extension of the canals or by a small AO table, by the achieved stability makes conditions of immediate motions and an early rehabilitation. Because of that it gives the best functional results.