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。     

34CrNi3Mo钢高温变形行为的研究

利用Ｆｏｒｍａｓｔｏｒ－Ｐｒｅｓｓ热模拟试验机，研究了３４ＣｒＮｉ３Ｍｏ合金结构钢在温度８４０～１２００℃变形速度０．１～８０ｓ＾－１的变形条件下的热压缩行为，获得了３４ＣｒＮｉ３Ｍｏ钢在热变形时发生动态再结晶的临界条件（包括临界因子Ｚ１和临界应变ε）及再结晶粒大小Ｄｄｙｎ与Ｚｅｎｅｒ－Ｈｏｌｌｏｍｏｎ因子Ｚ，奥氏体起始晶粒尺寸Ｄ０和应变ε之间的关系，并给出了回归公式。     

34CrNi3Mo钢的高温变形行为

利用Ｆｏｒｍａｓｔｏｒ－Ｐｒｅｓｓ热模拟试验机，研究了３４ＣｒＮｉ３Ｍｏ合金结构钢在温度８４０￣１２００℃，变形速度０．１￣８０ｓ＾－１的变形条件下的热压缩行为。获得了３４ＣｒＮｉ３Ｍｏ钢在热变形时发生动态再结晶的临界条件（包括临界因子Ｚｃ和临界应变εｃ）及再结晶晶粒大小Ｄｄｙｎ与Ｚｅｎｅｒ－Ｈｏｌｌｏｍｏｎ因子Ｚ、奥氏体起始晶粒尺寸Ｄ０和应变ε之间的关系，并给出了回归公式。     

10Ti钢高温变形流变应力模型及晶粒大小变化

用热模拟试验机在１１５０￣８５０℃变形温度、６０￣０．１ｓ＾－１变形速率条件下对１０Ｔｉ钢做恒温单道次压缩实验。得到变形激活能４２０ＫＪ／ｍｏｌ，应力指数１２和峰值前流变应力数学模型及临界应变、流变应力、峰值应力与Ｚ参数关系。随变形温度升高，应变速率下降，晶粒大小呈上升趋势。得到动态再结晶晶粒大小与Ｚ参数关系。     

高速钢的组织超细化与超塑性变形力学行为

研究了Ｗ６Ｍｏ５Ｃｒ４Ｖ２高速钢的超细化热处理工艺和超塑变形力学行为。结果表明，该钢在１０４０℃两次循环淬火是实现其超细化的最佳热处理工艺；按此工艺进行预处理后，在８１０℃、初始应变速率为３．３３×１０＾－４ｓ＾－１的最佳变形条件下，该钢的超塑伸长率可达１９２％，流变应力为５８ＭＰａ，应变速率敏感性指数（ｍ）为０．２７。     

Q235钢亚态再结晶模型的建立

在物理冶金基本模型基础上，通过实验数据进行回归，建立了Ｑ２３５普碳钢的亚态再结晶及晶粒长大模型，模型和实验所测结果相吻合，采用双道次进行压缩实验，条件为变形速率０．０１－０．１ｓ＾－１，变形温度９５－１１００℃，初始晶粒尺寸５６－８５μｍ。     

超高强度钢A100本构方程与动态再结晶行为

使用Gleeble-3500热模拟试验机对A100超高强度钢在应变速率为0.01～10 s-1、变形量为63.3%、变形温度为850～1 200℃条件下的流变应力行为进行了试验研究，并结合微观组织分析了不同变形条件下动态再结晶行为。结果表明：A100钢热压缩变形中流变应力随温度的增加而降低，随应变速率的增加而增加。在850℃变形时主要发生动态回复，在变形温度为900～1 200℃、应变速率为0.01～10 s-1均发生动态再结晶。基于Arrhenius双曲正弦模型，利用线性回归方法建立了高强钢A100的本构方程，为A100钢的数值模拟和热加工工艺的制定提供了理论基础。     

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     

Custom 450高强度不锈钢的动态再结晶行为

为了探究Custom 450钢的动态再结晶行为,采用Gleeble-3800热模拟试验机,在变形温度为1 050～1 200℃和应变速率为0.01～10 s~(-1)的变形条件下开展了单道次等温压缩试验。研究结果显示,在变形温度为1 050～1 200℃和应变速率为1.0～10 s~(-1)的变形范围内,钢虽发生了完全的动态再结晶,但应力应变曲线未表现出明显的应力峰值;钢的动态再结晶的晶粒尺寸随着变形温度的升高和应变速率的降低逐渐增大,当应变速率为0.01 s~(-1)时,动态再结晶晶粒发生长大。采用双曲正弦函数构建了Cutom 450钢的热变形方程,并建立了钢的动态再结晶动力学、临界应变、峰值应变及动态再结晶晶粒尺寸与Zener-Holloman参数的定量关系。     

热变形对40CrMnMo钢的晶粒尺寸影响规律研究

采用了MMS-200热力模拟机以40CrMnMo钢为实验对象进行了热压缩试验,研究了变形温度850℃～1150℃,变形量0.8,应变速率在0.01～10s~(-1)条件下实验钢的热变形行为。通过分析高温下变形参数对流变应力和奥氏体晶粒尺寸的影响,建立40CrMnMo钢的稳态动态再结晶晶粒尺寸模型。结果表明:变形温度为850℃～1150℃,实验钢在应变速率0.01～0.1s~(-1)下发生连续动态再结晶,应变速率1～10s~(-1)下发生动态回复。通过引入Zener-Hollomon(Z)参数表征变形参数对稳态动态再结晶晶粒尺寸的影响,建立了稳态再结晶晶粒尺寸的数学模型,得出提高应变速率或变形温度较低能使Z参数增大,峰值应力升高且动态再结晶晶粒减小。     

Chinalco Signed Framework Agreement for Strategic Cooperation with Harbin Municipal Government

正Last month,Chinalco signed framework agreement for strategic cooperation with Harbin Municipal Government in Harbin Xiong Weiping,Chairman of Chinalco,said that based on the strategic deployment to build world top-class mining company with the highest growth potential,Chinalco was now concentrating all efforts on making strategic transition and structural adjustment,strategic cooperation with the local governments where     

Jiangxi Promotes Jiangxi Copper Corporation To Become The World's Most Competitive Mining Company

<正>According to the latest info from Jiangxi Province State-owned Assets Supervision and Administration Commission,Jiangxi Copper Corporation was approved to become the first pilot enterprise for deepening reform.Contents of the pilot work is"Three Self"(self expansion,self decision-making,self     

Journal of Rare Earths Contents List of Vol.32(2014)

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Contributions to Baosteel Technical Research wanted

正Baosteel Technical Research,a quarterly journal,which is issued domestically and abroad,is run and sponsored by Baosteel Group Corporation.Baosteel Technical Research mainly reports the achievements in technological innovation,academic research,new product development and industrial equipment improvement by Baosteel.It will continue to follow up on hot topics and serve the company’s technological development and progress.Its readers include experts in     

Ministry of Industry and Information Technology: No Short Term Solution For Our Country’s Excess Nonferrous Metal Smelting Capacity

【正】According to the Ministry of Industry and Information Technology,the Ministry has released the 2013 Operation Report on China’s Industrial Communication Indu...     

Chinalco Signed Framework Agreement for Strategic Cooperation with Gansu Province

正Recently,Chinalco and Gansu Provincial People’s Government signed"Framework Agreement for Strategic Cooperation on Reform,Restructuring and Transition Development of Chinalco’s Electrolytic Aluminum Enterprises in Gansu",signifying that the strategic cooperation between Chinalco and Gansu Province had made new substantive progress.     

Unavoidable Economic Cycle:30% Of Nonferrous Metal Companies Were Involved In Restructuring

正Owing to continual downturn in real estate and bulk commodity markets,a number of traditional industries in China suffered unfavorable impact in performance.With the progressive disclosure of third quarter report,the no-pleasant-surprise performance of     

Baotou Rare Earth Became the World's Biggest High Performance Magnetic Material Base

正The High Performance Magnetic Material Phase II Project,an industry upgrading project implemented by Inner Mongolia Baotou IronSteel Rare Earth(Group)Hi-tech Co.,Ltd,recently basically finished equipment commissioning,signifying that the enterprise had developed the production capacity of15000 t/a Nd-Fe-B strip casting alloy and 5000t/a Nd-Fe-B magnet,thus becoming the world’s     

Introducing Two Central Enterprises to Integrate Rare Earth Industry,Shandong Rare Earth Group Breaks Surface

正With the signing of"Letter of intention for Propelling Integration of Shandong Rare Earth Enterprises"between Shandong Province Commission Of Economy and Informatization,China IronSteel Research Institute Group("China Steel Institute"),and China Rare MetalsRare Earth Co.,Ltd("China Rare Earth"),the"Shandong Rare Earth Group"jointly set up by the 3 units thus broke surface.On August 9,reporters of the China Economic Herald learned from Shandong Province     

Aluminium Production by Province or City in 2014

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