GH871台金的蠕变断裂机制

对采用AIM ESR和VIM ESR工艺冶炼的GH871合金在650℃的蠕变性能及特征的研究表明，与用AIM ESR工艺冶炼的GH871合金相比，用VIM ESR工艺冶炼的GH871合金在蠕变断裂过程中裂纹萌生的形式(包括裂纹形状及形成时间)和裂纹扩展至裂纹连接所需的时间均表现出明显韧化的特征。     

真空感应冶炼—电渣重熔GH871合金的力学性能

研究了采用真空感应（VIM）＋电渣重熔（ESR）工艺冶炼的新型含铌铁基高温合金GH871的650℃蠕变性能、持久性能、疲劳性能及20－800℃冲击功、瞬时拉伸性能并与非真空感应（AIM）＋ESR GH871合金对比。结果表明：真空冶炼的GH871合金提高了650℃持久塑性，并达到5％以上。     

GH3128 合金"VIM + ESR”和“NVIM + ESR”冶炼过程中的脱气行为及夹杂物研究

利用氧氮分析仪对"真空感应熔炼+电渣重熔"（VIM+ESR）和"非真空感应熔炼+电渣重熔"（NVIM+ESR）两种冶炼工艺下冶炼GH3128合金中的氧含量、氮含量进行检测,并进行了脱氧、脱氮的热力学计算;利用ASPEX扫描电镜分析了两种冶炼工艺下GH3128合金中夹杂物的成分、尺寸分布以及数量。结果表明,采用"VIM+ESR"工艺更能有效的去除合金液中的氮,夹杂物类型主要是Al-Ti-O型复合氧化物夹杂,还有少部分的Al₂O₃、TiO_x氧化物夹杂,而采用"NVIM+ESR"的双联工艺,合金中产生的夹杂除氧化物夹杂类,还有硫化物、氮化物夹杂;且采用真空冶炼工艺更能有效降低夹杂物数量,并细化夹杂物。     

全封闭Ar气保护电渣重熔GH4169合金

上海五钢采用ALD 5t全封闭Ar气保护电渣重熔炉 ESR(Ar)冶炼了GH4 16 9合金锭 ,分析结果表明 ,ESR(Ar)电渣锭氧、硫含量和锭头尾碳、铝、钛之差远低于一般ESR工艺 ;VIM(真空感应熔炼 ) +ESR(Ar)工艺冶炼合金中平均氧含量 6× 10 - 6 远低于VIM +VAR(真空电弧重熔 )工艺冶炼合金中平均氧含量 13× 10 - 6 ,所以ESR(Ar)工艺脱氧效果优于VAR工艺     

热处理工艺对真空冶炼GH871合金性能的影响

研究了15种热处理工艺对采用VIM配合ESR双联工艺冶炼的GH871合金力学性能的影响。结果表明:在保持高强度高持久寿命的同时提高该合金650℃持久塑性的最佳热处理工艺为980℃×1h固溶,油冷+720℃×16h时效,空冷。经此热处理后,该合金在保持室温抗拉强度为1130MPa、650℃抗拉强度为890MPa的同时,650℃持久塑性达5%以上。     

冶炼工艺对FGH96合金洁净度的影响

研究了不同冶炼工艺对粉末高温合金洁净度影响，通过扫描电镜及能谱仪对比研究了真空感应熔炼(VIM)、真空水平连铸(VHCC)和真空感应熔炼(VIM)+电渣重熔(ESR)3种冶炼工艺对FGH96母合金棒料杂质元素含量及夹杂物成分、形貌、尺寸、数量的影响。研究结果表明，采用VHCC或VIM+ESR双联工艺比采用VIM单联工艺制备的粉末母合金具有更高的洁净度。3种冶炼工艺生产的母合金棒料中夹杂物均由氧化物夹杂、碳氮化物夹杂和以氧化物为核心的碳氮化物复合夹杂组成。VIM单联制备的母合金棒料夹杂物数量和尺寸明显高于VHCC和ESR生产的棒料；VHCC棒料中夹杂物数量最少，且分布均匀；ESR棒料夹杂物尺寸最小，但边缘处夹杂物数量最多。3种工艺生产的棒料通过等离子旋转电极制粉后，筛出的夹杂物数量变化趋势与母合金基本一致，VIM+ESR冶炼工艺可以有效提高FGH96合金棒料及其粉末洁净度。     

合金脱硫工艺的研究

利用MgO坩埚和CaO坩埚 ,采用“真空感应 (VIM )工艺”和“真空感应 (VIM ) +电渣重熔(ESR)工艺”冶炼Inconel 718合金 ,试验结果表明CaO的脱硫效果优于MgO的 ,VIM +ESR双联工艺的脱硫效果优于VIM单联工艺的     

采用VIM+VAR+ESR三联工艺冶炼 GH4169合金的试验研究

进行了采用VIM+VAR+ESR三联工艺冶炼GH4169合金的研究,结果表明当ESR在大气中进行时,合金中的氧含量增加,合金锭不同部位会发生不同程度的铝、钛烧损,但合金中硫含量显著下降;当ESR采用氩气保护,并降低熔炼电压,上述问题可获得解决,但脱硫效果下降;显著提高ESR渣系中CaO的含量,可以提高脱硫效果,但应添加脱氧剂以解决铝的烧损问题;含MgO的渣系可实现合金良好的微镁合金化;应用封闭式ESR炉与现代工艺技术,可实现GH4169合金冶金质量、材质的均匀性与力学性能的显著提高.     

冶炼工艺对GH871合金裂纹扩展速率的影响

对GH871合金的裂纹扩展速率及扩展行为的研究结果表明由于真空冶炼降低了弱化合金晶界的有害元素Pb含量,显著降低了该合金的裂纹扩展速率。     

冶炼工艺对GH871合金裂纹护展速率的影响

对GH871合金的裂纹扩展速率及扩展行为的研究结果表明：由于真空冶炼降低了弱化合金晶界的有害元素Pb含量,显著降低了该合金的裂纹扩展速率。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.