关于06MnVAl低温用钢脆化问题

０６ＭｎＶＬ１钢系正火态交货的微珠光体低温（－６０℃）用钢，在回火或焊接热循环作用下其母材及焊接热影响区的冲击韧性均有明显下降，严重是影响了此钢的推广和应用。对０６ＭｎＶＡ１钢进行了试验、观察和分析，结果表明，这种钢的母材及热影响区经回火或在经受焊接热循环作用后脆化主要是由于超细的Ｖ粒子沿位错线的二次析出，以及回火温度和焊接热循环温度峰值达到或超过Ａｃｌ后空冷时出现岛状相所造成的。     

U71Mn重轨钢焊接性能的模拟研究

利用Ｇｌｅｅｂｌｅ－１５００试验机对鞍钢生产的Ｕ７１Ｍｎ重轨钢进行接触闪光焊的模拟试验。研究了焊接热影响区（ＨＡＺ）的显微组织与力学性能，分析Ｕ７１Ｍｎ重轨钢的冷却转变行为，焊后冷却速度，化学成分等对焊接性能的影响。     

Nb,V,Ti微合金化C—Mn钢热影响区显微组织和沉积行为

研究了在非平衡态，即焊接热循环条件下，Ｎｂ－Ｖ－Ｔｉ微合金化Ｃ－Ｍｎ钢中总含氮量（以下简称含氮量一译者注）对焊接热影区（ＨＡＺ）韧性，显微组织和地为的影响。ＨＡＺ韧性随含氮量增加而提高，含氮量高达８０ｐｐｍ时，１００Ｊ的转变温度最低。随含氮量增加，显微组织细化，固溶Ｎｂ，Ｔｉ减少，因而改善了ＨＡＺ韧性，经焊接热循环后，在Ｎｂ－Ｖ－Ｔｉ钢中观察到了Ｎｂ，Ｔｉ 事沉淀相。随含氮量增加，这些沉淀９粒子变     

Ti微合金化海上平台用钢的可焊性和韧性评价

本工作旨在研究ＳｔＥ３５５级海上平台用钢粗晶热影响区（ＣＧＨＡＺ）的显微组织和裂纹尖端引开位移（ＣＴＯＤ）韧性。研究了三种母材（４０ｍｍ）厚。其中两种为添加了钛的Ｎｂ＋Ｖ钢或Ｎｂ钢；第三种钢为未添加钛的传统ＳｔＥ３５５钢，它也进行了焊接，作为对比。制作了多道吕列埋弧焊（ＳＡＷ）和手工电弧焊（ＳＭＡＷ）焊件，模拟了各种ＨＡＺ显微组织来证实焊接对韧性的有害作用；用光学显微镜和电镜检验了所有的焊接热影响     

焊接热循环对X52超细晶粒钢组织与性能的影响

研究了Ｘ５２超细晶粒钢热影响区的组织和性能,发现焊接热循环曲线对其有重要影响,综合考虑ＨＡＺ的组织、性能和接头的质量、最佳的ｔ８／５应控制在５－１０ｓ之间。     

微量钛对控轧微合金钢焊接HAZ的组织和韧性的影响

通过模拟焊接热循环，在ＧＬｅｅｂ－１５００装置上模拟了ｖ－Ｔｉ－Ｎ和Ｖ－Ｎ钢焊接热影响区粗晶区（ＧＣ－ＨＡＺ）的组织，并用示波冲击法测定了不同△（从８００℃到５００℃的冷却时间）试样的Ａｋｖ值、解理裂纹形核功（Ｅｉ）和扩展功（Ｅｐ）。用光学显微镜、ＳＥＭ和ＴＥＭ对这两种钢高温奥氏体的晶粒尺寸、过冷奥氏体转变产物和各△条件下的冲击断口进行了定量分析和观察，探讨了加微量钛对焊接ＧＣ－ＨＡＺ的组织和韧性的影响。试验结果表明，与Ｖ－Ｎ钢相比，Ｖ－Ｔｉ－Ｎ钢由于含有适量的钛，使奥氏体晶粒及其转变产物显著细化，并且奥氏体转变产物的形态和分布也得到改善，这使Ｖ－Ｔｉ－Ｎ钢ＧＣ－ＨＡＺ的韧性显著高于Ｖ－Ｎ钢。     

HQ130钢焊接熔合区的裂纹形态

通过抗裂性试验对ＨＱ１３０高强钢焊接熔合区附近裂纹的产生及扩展行为进行了研究,结合超声波探测、金相和扫描电镜（ＳＥＭ）观察对裂纹形态进行了分析。试验结果表明,ＨＱ１３０ 钢焊接裂纹大多起源于距熔化边界线２０～６０ μｍ 的半熔化区,一般平行于熔合区扩展或越过熔合区拐向焊缝。采用“低强匹配”焊材可提高焊缝金属的韧性储备,缓解熔合区附近的应力集中,有利于防止焊接冷裂纹的产生。     

焊接接头氢陷阱性质及捕获氢能力

用电火花切割方法，制备出１０ＳｉＭｎＮｉＣｒ钢焊接接头母材、熔合线（含ＨＡＺ区）及焊肉的特殊试样。用真空加热炉分别作晶界、夹杂陷阱氢逸出处理，用离子探针测氢逸出量（或捕获量），结果是（１）焊接接头的晶界陷阱及夹杂物陷阱捕氢量依焊缝、ＨＡＺ、母材次序从高到低；（２）晶界陷阱是弱陷阱，夹杂陷阱是强陷阱。     

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。     

大厚度F690超高强海工钢临界再热粗晶区组织脆化研究

采用Gleeble-3800热模拟试验机进行一次焊接热循环和二次焊接热循环模拟试验,研究100mm厚超高强海洋工程用钢F690焊接热影响区临界再热粗晶区的组织和性能特征。结果表明:大厚度超高强F690钢板在二次焊接热循环作用下,临界再热粗晶区(ICCGHAZ)生成大量M-A组织,由于这些M-A组织呈链珠状沿原始奥氏体晶界分布,严重恶化组织的低温韧性,导致热影响区局部脆化。因此,大厚度超高强海工钢不仅需要在成分设计时特别考虑焊接性能,而且还要在多层多道次焊接过程中严格控制焊接热输入量和层间温度,避免热影响区组织脆化现象。     

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.