T10A钢组织超细化预处理后的超塑性压缩试验

采用盐浴加热循环淬火和高频感应加热淬火对T10A钢进行组织超细化预处理，然后在恒温压缩变形条件下进行超塑性研究。试验表明，在710～770℃、初始应变速率10^-4～10^-3s^-1的变形条件下，该钢的σ-ε曲线具有明显的超塑流变特征，稳态流变应力仅40MPa左右，应变速率敏感性指数可达0．5，变形激活能为183～194kJ／mol，与α—Fe晶界自扩散激活能接近。高频淬火较循环淬火有更好的组织细化效果，因而高频淬火预处理后的超塑性流变特征更明显。本试验为该钢的超塑成形和超塑性固态焊接提供了工艺和理论分析依据。     

应用ProcessingMap研究D2钢高温变形的动态应变时效

应用以动态材料模型为基础的ＰｒｏｃｅｓｓｉｎｇＭａｐ研究了Ｄ２钢在变形温度９００～１１６０℃、变形速率０．０１～１０．００ｓ－１区间的动态应变时效规律。结果表明，Ｄ２钢在变形温度为１１２０～１１５０℃、变形速率为０．０１ｓ－１条件下发生动态应变时效，并表现出强烈的硬化效应。同时，应变速率敏感系数小于零可以作为发生动态应变时效的一个标志。     

冷作模具钢D2钢高温变形行为的研究

利用ＧＬＥＥＢＬＥ－１５００热力模拟机，对Ｄ２钢的高温变形行为进行实验研究，结果表明：Ｄ２钢在变形温度为９００￣１１６０℃、变形速率为０．０１￣１０ｓ＾－１的区间变形时，发生动态再结晶、动态应变时效、脆性穿晶断裂以及热裂等过程，并分析了其原因。在此基础上对Ｄ２钢的高温变形工艺制度进行了优化，以指导生产实践。     

Ti3Al-Nb合金超塑压缩变形的研究

研究了Ｔｉ－２４Ａｌ－１４Ｎｂ－３Ｖ－０．５Ｍｏ合金压缩时的超塑变形行为和变形过程中的组织变化。结果表明：所研究合金在ｔ＝９８０℃、ε＝７．２×１０－３ｓ－１的条件下ｍ值为０．３４,压缩时的真应变可大于１．６。在合金的超塑变形初期,Ｏ相发生动态再结晶和等轴化过程。随着变形过程的进行,新形成的Ｏ相晶粒在Ｂ２相中滑动和转动,Ｂ２相中的位错运动和界面扩散起调节作用     

TA32钛合金板材的超塑性能研究

研究了真空环境中TA32钛合金板材在温度950℃、应变速率5.32×10^-4~2.08×10^-2 s^-1条件下的超塑性变形行为。结果表明,在不同应变速率条件下,合金的流变应力曲线特征和显微组织演变显著不同。在应变速率较低(5.32×10^-4~3.33×10^-3 s^-1)条件下,拉伸真应力-真应变曲线呈传统超塑变形的稳态流动特征,变形后的合金中初生α相晶粒尺寸较大;在高应变速率(8.31×10^-3 s^-1~2.08×10^-2 s^-1)条件下,拉伸真应力-真应变曲线中流变应力增大到峰值后快速单调递减直至试样断裂,合金变形过程中初生α相发生动态再结晶,晶粒尺寸较低应变速率条件下显著细化。950℃时,TA32钛合金板材均具有超塑性变形能力,超塑性延伸率在145%~519%之间;当应变速率为5.32×10^-4 s^-1时,具有最佳的超塑性,拉伸延伸率可达519%。断裂区形貌分析发现,TA32钛合金板材的超塑性断裂模式为空洞聚集-连接-长大型断裂。     

40Cr钢的恒温超塑性焊接

探讨了利用情理温超塑性实现４０Ｃｒ钢固相焊接的可行性及影响因素，并对超塑焊接接头及组织进行了观察与分析，试验表明，经超细化处理后的４０Ｃｒ钢在超塑性变形温度及应变速率范围内经短时超塑压接即可实现接头力学性能与基体相同的固相焊接。     

TA32钛合金板材的超塑性性能研究

研究了真空环境中TA32钛合金在950℃,初始变形速率在5.32×10-4~2.08×10-2s-1条件下的超塑性变形行为。结果表明,不同应变速率条件下,板材的流变应力曲线特征和显微组织演变呈现显著不同。在应变速率较低条件下(5.32×10-4 ~3.33×10-3s-1),拉伸真应力-应变曲线呈传统超塑变形的稳态流动特征,变形后的板材中初生α相晶粒尺寸较大;在高应变速率（8.31×10-3 s-1~2.08×10-2 s-1）条件下,拉伸真应力-应变曲线中流变应力增大到峰值后快速单调递减直到断裂,变形后的板材中初生α相发生动态再结晶,晶粒尺寸与低应变速率条件拉伸的板材相比显著细化。在950℃下,TA32钛合金板材均具有超塑性变形能力,超塑性延伸率在145%~519%之间,当应变速率为5.32×10-4s-1时,板材具有最佳的超塑性性能,拉伸延伸率可达519%。断裂区分析发现,TA32钛合金板材的超塑性断裂模式为空洞聚集-连接-长大型断裂。     

搅拌摩擦焊Ti-4.5Al-3V-2Fe-2Mo合金的超塑性变形行为研究

SP700钛合金(Ti-4.5Al-3V-2Fe-2Mo)具有非常优异的低温超塑性和较宽的低温热加工窗口。本文分别采用最大m值法和恒应变速率法,针对SP700钛合金搅拌摩擦焊接头超塑性变形行为进行了研究。研究结果表明:采用最大m值法在795℃获得了最大超塑延伸率为989.9%;采用恒应变速率法,在795℃、应变速率为5×10~(-4)s~(-1)条件下获得最大超塑延伸率为687%。两种方法较母材的最佳超塑温度(765℃)均有所提高。对比搅拌摩擦焊焊核区的细晶组织,经超塑拉伸变形后,微观组织晶粒粗化严重,且β相含量减少。引起晶粒显著粗化的原因可能是经搅拌摩擦焊剧烈的塑性变形后导致的晶粒内部畸变能增加,在后续的超塑变形过程中晶粒长大势能增加所致。较高应变速率条件下的变形机制为晶粒拉长、长大、断裂和再结晶球化。搅拌摩擦焊焊接接头焊核区及热机械影响区存在较为明显的组织不均匀,经超塑变形可有效改善搅拌摩擦焊焊接接头的组织不均匀性。     

低碳贝氏体钢的摩擦焊接性

试验研究了低碳贝菌体钢０．１７℃－１，１．７２Ｍｎ－１。１２Ｃｒ－０．５２Ｍｏ的焊接工艺参数及热处理对组织和性能的影响。结果表明，摩擦变形量为１．０ｍｍ，焊接接头采用９１０℃正火。３５０℃回火，可得到良好的组织和性能。     

25—20型铬镍奥氏体不锈钢的成分优化和组织性能研究

研究了碳，铬，铌对铬－镍奥氏体不锈钢在沸腾８ＮＨＮＯ３－０．４２ＭＦｅ＾３＋－０．８３ＭＳＯ＾２－４－１．３ＭＮａ＾＋介质中均匀腐蚀和晶间腐蚀的影响；提出了耐蚀材料００Ｃｒ２５Ｎｉ２０Ｎｂ的最佳成分，评价了敏化条件对００Ｃｒ２５Ｎｉ２０Ｎｂ冲击专访韧性，显微组织的影响。采用硝酸法（ＧＢ１２２３－７５Ｘ法）检验了敏化条件与晶间腐蚀行为的关系。结果表明，６５０℃是该钢析出Ｍ２３Ｃ６的最敏感温度，达到晶     

Acceleration of Electricity Reform Brings Benefit to Big Electricity Users,Aluminum Manufacturers Can Save Costs Up to Several Hundred Million

<正>Recently the National Commission of Development and Reform again assembled experts to solicit opinions,and discussed new electricity reform program.According to information disclosed by experts attending the meeting,in the future electricity reform will undergo top-down design,possibly a     

Qinghai's Aluminum Processing Capacity to Rise at the End of the Year

正Since the release of Implementation Opinions on Carrying out‘Guiding Opinions of the State Council on Resolving Serious Production Overcapacity Conflicts’,according to the actual situation of industry,Qinghai has focused on electrolytic aluminum,cement,ironsteel(including iron alloy and silicon carbide),     

Recent Trends in China's Copper Scrap Market-Part Ⅱ

<正>2.Tianjin Scrap Metal Market In Tianjin,we mainly visited Jinghai Ziy Town scrap market and Binhai New Area’some copper scrap enterprises and enterprise using copper scrap.In Ziya we felt the coppe scrap market was particularly deserted,mos copper scrap enterprises in the town wer closed,industry insiders said in 2012 the plac here was bustling with activity.According to     

Shanghai Clearing House to Roll out Renminbi-denominated Copper Clearing Operations in Free Trade Zone

正Clearing House Financial Markets Co.,Ltd.(Shanghai Clearing House)General Manager Xie Zhong told the media recently at the briefing of the international symposium of"Reform Deepening and Mechanism Innovation of the Post-crisis Kerb Market",Shanghai Clearing House will explore the feasibility of carrying out bond business in     

Development and Application of New Materials for Copper Processing in China

正After over 60 years of developmnt,a system for RD and production of copper processing materials has already taken shape in China.After the reform and opening-up,the application of copper processing materials has gradually expanded from the military industry to civil field.The annual output of copper     

China’s Mineral Exploration Market Downturn Causes Decline of Investment in Bauxite

<正>According to a survey report conducted recently by China Geological Survey Development Research Center,in the first half of 2014,China’s mineral exploration market continued to decline,with the investment in exploration of non-fuel minerals dropping by13.7%and drilling workload dropping by21.7%.According to statistical analysis of the Center,     

Chinalco and China National Administration of Coal Geology Jointly Built Guangxi Rare Earth Industrial Base

正On June 3,Chinalco and China National Administration of Coal Geology signed cooperation agreement for strategic cooperationcooperation agreement between Chinalco Guangxi Nonferrous Rare Earth Development Company and Xuzhou Jin Shi Pengyuan Rare Earth Material Factory.According to the agreement,both sides would jointly support Chinalco Guangxi Nonferrous Rare Earth Development Company and Xuzhou Jin Shi Pengyuan Rare Earth Material Factory to carry out comprehensive cooperation covering rare     

Aluminium Production by Province or City in 2014

正~~     

Fabricated Copper Production by Province or City in 2014

正~~     

Zinc Production by Province in 2014

正~~