共搜索到724条信息，每页显示10条信息，共73页。用时：0小时0分0秒587毫秒
the susceptibility of specimens given a two-step heat treatment. The results reveal that IGC occurs in the specimens aged at the temperature range of 600–750℃ for a short time. The aging time that is required to cause IGC decreases with the increase of aging temperature. A longer aging treatment can reduce the susceptibility to IGC. The microstructural observation shows that M23C6 precipitates form along......
果与实际情况基本吻合.分析结果表明,涡轮叶稍处产生热裂的根本原因是凝固过程中产生了拉应力,应力值越大,铸件处于热裂敏感区的时间越长,热裂倾向性越大；采用较高的模壳温度和较低的浇注温度有利于降低铸件的热裂倾向.关键词:K418合金；车用增压涡轮；热裂；浇注工艺；数值模拟Hot tearing susceptibility analysis and prediction of K418... in order to solve the hot tearing problem in the K418 superalloy auto turbocharger turbine wheel. The susceptibility of hot tearing defects was predicted by analyzing the simulation results......
; 文章编号:1672-7207(2009)04-1127-06 Landslides susceptibility mapped with CF and Logistic regression model WANG Wei-dong1, 2, CHEN Yan-ping1, ZHONG Sheng1 (1... susceptibility mapped in Guizhou Province was established through integrating a certainty factor (CF) and the Logistic regression model based on geology information system (GIS). The procedures were......
. China Petroleum Pipeline Bureau摘 要:The hydrogen permeation behavior and stress corrosion cracking(SCC) susceptibility of precharged 7075-T6 Al alloy were... solution. Electrochemical experiment results show that the SCC susceptibility is low during anodic polarization. Both corrosion pits and hydrogen-induced cracking are evident in scanning electron microscope......
冷加工对304不锈钢孔蚀敏感性的影响 张新生1,王东1,许淳淳1,雒娅楠1,胡钢1 (1.北京化工大学材料科学与工程学院,北京,100029;2.金属腐蚀与防护国家重点实验室,沈阳,110016) 摘要:对304不锈钢设备由于冷加工产生的马氏体相变进行现场测试.结果表明,室温下经不同方式,不同程度冷加工后,相关部位的马氏体相变量约在0.5%~10%.用电化学动电位极化法,恒电流电位-时间曲线测定法和模拟闭塞电池法研究经-70℃不同程度拉伸变形的304不锈钢在3.5%NaCl水溶液(50℃±1℃)中的孔蚀击穿电位(Eb),稳态孔蚀成核电位(Enp)和自腐蚀电位(Ecorr)与马氏体相变量的......
溶解氧对X70管线钢在高pH值溶液中的电化学行为和SCC敏感性的影响 周建江1,杨武1,李光福1,刘杏2 (1.上海材料研究所腐蚀实验室,上海,200437;2.上海材料研究所检测中心,上海,200437) 摘要:采用动电位极化,恒电位极化曲线测试法研究了X70管线钢在0.5 mol/L Na2CO3+1 mol/L NaHCO3溶液中的电化学行为,分析了供氧状况和扫描速度等因素对极化曲线的影响.采用慢应变速率试验(SSRT)研究了X70管线钢在不同供氧状况的溶液中的应力腐蚀破裂(SCC)敏感性.结果表明,X70管线钢在通高纯氮气和不通气溶液中的动电位极化曲线形状相似,但是在通压缩空气的......
岩矿石磁化率测量方法在智利瑞康纳达地区的研究及应用 方维萱1,海欧2,张德会1,王磊1 (1.中国地质大学(北京;2.有色金属矿产地质调查中心新疆地质调查所,北京,100029) 摘要:研究智利科皮亚波市瑞康纳达地区不同岩矿石的磁化率,进行对比找出规律.探讨磁化率对寻找铁氧化物铜金型矿床的指示作用,及蚀变岩石的磁化率强度与矿石蚀变类型及含矿性的关系.系统测量这一地区的岩石磁化率,同时进行矿物蚀变填图,圈定蚀变带,提供进一步的找矿信息及标志. 关键词:IOCG; 矿物蚀变; 磁化率; 矿化; [全文内容正在添加中] ......
composition Ti-48Al-2Cr-2Nb (at.%) alloy was assessed. The microstructure characterization and cracking susceptibility of the joints were evaluated by means of OM, SEM, XRD, and microhardness.It was found......
, Yiyang 413000, China) Abstract: The effects of various aging treatments on intergranular and exfoliation corrosion susceptibility of Al-Zn-Cu-Mg-Zr alloys containing Sc were studied using corrosion tests, polarization curve and electrochemical impedance spectroscopy(EIS). The results show that the naturally aged(NA) alloy has the highest susceptibility of intergranular and exfoliation corrosion......
="ChDivSummary">The stress corrosion cracking(SCC) behaviour of 7A52 aluminum alloy in air and in 3.5% NaCl solution was researched by slow strain rate test(SSRT) and SEM-EDS. The SCC susceptibility was estimated with the loss of the reduction in area. The experimental results indicate that the SCC susceptibility of 7A52 aluminum alloy in 3.5% chloride solution is the highest at strain rate of 1......
