高强度粉末冶金零件的电阻凸焊组合

研究了Ｆｅ－Ｃ－Ｃｕ－Ｎｉ－Ｍｏ系高强度粉末冶金零件的电阻凸焊工艺以及焊前和焊后热处理对焊接强度的影响。结果表明，粉末冶金制品在适当的焊接规范下表现出良好的可焊性。在本实验条件下，最佳焊接参数为：电极压力Ｐ＝０．３ＭＰａ；焊接电压Ｕ＝６．０Ｖ；焊接时间ｔ＝０．５５ｓ。焊前的预热处理不利于提高焊接性能，焊后经８６０℃淬火及２００℃回火有利于改善焊区的显微组织，提高焊接强度。电阻凸焊工艺已成功应用于轿     

回火时间对0．16C－10Ni－14Co－1Cr－1Mo钢和0．23C－12Ni－14Co－3Cr－1Mo钢组织与性能的影响

研究了０．１６Ｃ－１０Ｎｉ－１４Ｃｏ－１Ｃｒ－１Ｍｏ（１６ＮｉＣｏ）钢在５１０℃和０．２３℃－１２Ｎｉ－１４Ｃｏ－３Ｃｒ－１Ｍｏ（２３ＮｉＣｏ）钢在４８２℃回火的组织与性能。随回火时间的延长，强度、硬度的降低主要是由于Ｍ_２Ｃ的粗化及与基体共格性降低所致。Ｍ_２Ｃ的粗化速度２３ＮｉＣｏ钢要小于１６ＮｉＣｏ钢。     

淬火时效对磁鼓铝合金性能的影响

本文研究了淬火时效制度对磁鼓铝合金挤压棒材性能的影响，并指出，对于Ａ１－３．５％Ｃｕ－１．６％Ｍｇ－０．９％Ｆｅ－１．５％Ｎｉ合金挤压棒材采用５００℃／３ｈ＋１７０℃／１２ｈ处理后，在车制磁鼓件时，具有良好的切削性能，精车后表面光洁度可达，磁鼓的表面布氏硬度≥１１００ＭＰａ，装机使用具有较好的耐蚀性能。     

合金元素对16Cr铁素体铸钢耐热性能的影响

为开发一种铁素体耐铸钢用于发动机排气部件，研究了Ｃ，Ｍｏ，Ｎｂ，Ｖ对其高温屈服强度σ０．２，夏氏冲击韧性，转变温度（ＡＣ１）和高温抗氧化性能的影响。在转变温度以上（２００－３００℃范围内）合金元素对中温韧性影响极大，Ｃ含量从０．０４％增加到０．３％，９００℃时的σ０．２得到显著改善，但３００℃时的中温韧性和ＡＣ１温度降低，加入１％的Ｍｏ，Ｎｂ和Ｖ增大ＡＣ１温度分别为１４０℃，１２０℃和４０℃。增加     

热处理对马氏体不锈钢Fv520（B）力学性能的影响

研究了热处理对马氏体沉淀硬化不锈钢Ｆｖ５２０（Ｂ）：０．０５Ｃ－１４．５Ｃｒ－５．５Ｎｉ－１．８Ｃｕ－１．７Ｍｏ－０．３５Ｎｂ的组织和力学性能的影响。结果得出，经１０５０℃固溶处理＋８５０℃中间处理＋４７０℃时效时Ｆｖ５２０（Ｂ）钢的强度达到极大值，时效温度超过５２０℃时，形成逆转变奥氏体，残余奥氏体量增加，６２０℃达到最大值。     

Fc—C—Mo合金贝氏体相变特征和形貌

研究了高纯度Ｆｅ－０．０６４％Ｃ－１．８０％Ｍｏ和Ｆｅ－０．１９％Ｃ－１．８１％Ｍｏ合金在５５０－８５０℃恒温时的贝氏体转变。结果表明，转变是完全的。两种合金分别在６００℃和５８５℃左右恒温时，转变会出现暂时停滞的现象，而后恢复并加转变。两合金ＴＴＴ图均有一明显稳定，Ｔｂ温度上下铁素体形貌明显不同。在７００－８００℃恒温时，Ｍｏ２Ｃ碳化物平行于奥氏体晶粒界沉淀。     

甲烷—乙烯液体馏份输送泵用0.1C—20Mn—3.5Ni铸钢

－１１５～－１６５℃温度下在ＣＨ４＋Ｃ２Ｈ４液体中使用的新型铸钢０．１Ｃ－２０Ｍｎ－３．５Ｎｉ金相组织，断口形貌和力学性能的试验结果表明γ＋ε构成的双相组织具有良好的低温力学性能。     

铁素体—珠光体钢组织和性能关系

本文对含０．０６５％￣０．２２％Ｃ、０．００２￣０．０２１％Ｓ、０．６￣１．５％Ｍｎ、０．０２￣０．４％Ｓｉ（重量百分数）系列钢（普通Ｃ－Ｍｎ、Ｃ－Ｍｎ－Ａｌ、Ｃ－Ｍｎ－Ｎｂ－Ａｌ钢）进行了研究，大多数此类钢经常化处理，以８００￣４００℃的平均冷却速率在４０￣０．８Ｋｍｉｎ＾－１变化。这相当于１２￣５００ｍｍ厚板在空气中冷却的速率。一些高温奥氏体化处理随后炉冷的钢产生粗铁素体晶粒和粗晶界碳化物。得     

钛—硼和铝—硼处理对抗氢蚀1.25Cr—0.5Mo钢使用性能的影响

对Ａｌ－Ｂ或Ｔｉ－Ｂ处理的１．２５Ｃｒ－０．５Ｍｏ钢的研究结果表明：（１）Ａｌ－Ｂ和Ｔｉ－Ｂ处理明显增加了１．２５Ｃｒ－０．５Ｍｏ的淬透性，强度及塑、韧性；（２）Ａｌ－Ｂ和ＴｉＢ处理均使．２５Ｃｒ－０．５Ｍｏ钢的抗氧性能明显提高，当Ｂ含量相当时，Ｔｉ－Ｂ处理钢的抗氢蚀性能优于Ａｌ－Ｂ处理钢；（３）Ｂ含量较高时，钢的抗氧蚀性能较强，但塑、声望生及回火性能却相对较差，因此，较低含量Ｂ处理更有利于材料综     

STE355钢焊接热模拟回火组织研究

研究了焊后回火工艺（主要是回火温度）以ＳＴＥ３５５钢焊接组织的影响。采用１３２０℃的峰值温度分别２对试验样进行单道和多道焊接热模拟，然后在５００－６２０℃的范围回火１．５ｈ；用扫描电镜和透射电镜观察了焊后冷速没的试样在不同温度回火粕的显微组织变化，尤其是粒贝及Ｍ－Ａ组元的分解转化；根据显微组织与性能的关系提出了相对合适的回火工艺。     

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.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.