热处理温度对TA7钛合金板材组织与力学性能的影响

研究了TA7钛合金板材热加工态和经750、800、850℃3种不同温度热处理后的显微组织、室温拉伸性能、弯曲性能、高温拉伸性能和高温持久性能。结果表明，热加工态TA7钛合金板材横向存在不均匀组织，纵向有较多拉长α晶粒；经750℃热处理后板材拉长α晶粒转变为等轴状；经800℃热处理后板材横向与纵向均为均匀、细小的等轴组织；经850℃热处理后板材晶粒发生长大。热处理后板材强度降低，塑性增加，弯曲性能和高温持久性能均满足GJB 2505A—2018标准要求；随着热处理温度的升高，板材室温拉伸强度和高温拉伸强度均逐渐降低，经850℃热处理后板材的500℃高温拉伸强度已不能满足要求。为了获得均匀、细小的组织及良好的力学性能，TA7钛合金板材宜采用800℃热处理。     

热轧穿孔生产00cr22Ni5M03N大口径厚壁无缝管

1 前言 双相不锈钢在热加工温度范围内，仍然保持铁素体-奥氏体双相组织。高温变形时由于两相组织变形行为的差异，应力和应变分布不均匀，相界上容易形成裂纹并扩展，导致钢的热塑性下降，热加工性能不好。在无缝钢管的生产中，管坯的斜轧穿孔应力应变条件最为复杂和苛刻，对管坯材料的热塑性要求较高。因为双相不锈钢管的热塑性相对较差，热轧穿孔成材率低，特别是大口径钢管的生产现在仍是一个技术难题。[第一段]     

重轨坯火焰清理温度对成品钢轨裂纹的影响

介绍了在不同温度下进行火焰清理对比试验，确定钢坯清理部位生产裂纹的初始温度、实验室模拟重民制变形及进行裂纹焊合轧制试验，结果表明：钢坯火焰清理生产的裂纹，经热轧变形后仍有部分大能焊合，即钢轨钢的初始清理温度应≥２００℃。     

焊接用不锈钢HOCr21Ni10和H124Ni13的热塑性

通过楔形轧制及Ｇｌｅｅｂｌｅ热变形模拟试验，研究了焊接用不锈钢ＨＯＣｒ２１Ｎｉ１０和Ｈ１Ｃｒ２４Ｎｉ１３的热塑性。ＨＯＣｒ２１Ｎｉ１０的最佳塑性变形温度为９００－１０５０℃，Ｈ１Ｃｒ２４Ｎｉ１３为８５０－１０００℃，定量金相分析表明，在这样的温度下奥氏体基体中铁素体含量最少。采用偏低的加热温度，适当的保温时间和小变形量，多道次的工艺制度可以明显改善这两种不锈钢的热加工性能。     

钢中残余元素地连铸圆坯纵裂的影响

使用Ｇｌｅｅｂｌｅ机测定了不同残余元素含量的连铸圆坯试样的高温力学性能，结果表明：Ｃｕ当量（Ｃｕ＋１０Ｓｎ）＝０．３２％的试样在９２５￣１０００℃，特别是在９５０℃的热塑性显著降低；扫描电镜和俄歇检验发现，此温度下试样为沿晶断裂，在奥氏体晶界有Ｓｎ偏析。分析连铸生产条件认为，如拉速较低，结晶器内初生坯壳温度处于此高温脆性区，圆铸坯将可能产生纵裂。     

工艺参数对5Cr21Mn9Ni4N钢塑性的影响

本文讨论了热变形和冷变形工艺参数对５Ｃｒ２１Ｍｎ９Ｎｉ４Ｎ钢塑性的影响，提出大断面钢坯锻轧温度为１１００℃，小断面钢坯开轧温度为１１８０℃，并用冷轧代替冷拔成材的工艺流程。     

浅谈微合金元素对低合金钢热塑性的影响

介绍了几种微合金元素对低合金Ｃ－Ｍｎ钢热塑性的影响,分析了这些微合金元素影响热塑性的原因。结果表明,Ｃ－Ｍｎ钢中Ｃ含量在０．１８％左右时热塑性最低;Ｍｎ／Ｓ比低于５０时热塑性明显恶化;凡是能够在未变形前的１０００～１３００℃生成晶界析出物的元素,如Ｎｂ、Ａｌ、Ｓ特能降低钢,那些生成高温晶内析出物的元素,Ｔｉ、Ｃａ、Ｂ、ＲＥ等则能改善钢的热塑性。     

双辊铸带机铸造304型不锈钢的表面质量

为了研究从熔融金属直接生产薄带的带材铸造技术，在一台双辊铸带机上进行ＳＵＳ３０４钢的铸造试验。纵向裂纹和横向裂纹以及小凹坑是直接铸造薄带表面上显示出来的主要缺陷。应用水模型试验寻找在整个带材宽度上均匀浇注熔融金属并减少弯月液面波动的条件。通过降低浇注金属的落差，优化浇注位置，提高轧辊上浇注速率与钢液重量的比，达到凝壳厚度的均匀性，从而减少纵向裂纹和小凹坑的发生。此外，根据铸造过程中诸如冷却水温度的     

5Cr21Mn9Ni4N钢锻造裂纹分析和锻造温度参数选择

本文分析了５Ｃｒ２Ｍｎ９Ｎｉ４Ｎ钢锻造１４０ｍｍ方坯中产生的锻造裂纹，研究了模拟的相同和不同锻造加热温度和加热后的冷动过程中晶界和晶内惯析面上沉淀相的类型，形貌，分布特征和变化规律以及晶界和惯析面的弱化与裂纹形成的关系。结构表明，锻造裂纹形成主要与锻造加热温度过高和终锻温度过低有关。结合高温拉伸，热扭转试验结果，确定了锻造温度参数：加热温度为１１８０－１２００℃；开锻温度为１０８０－１１００℃；终     

钢坯火焰清理工艺温度制度对成品钢轨裂纹的影响

在不同温度下进行火焰清理对比试验，确定钢坯产生裂纹的开始温度，并模拟重轨轧制在试验室进行裂纹焊合轧制试验，结果表明，钢坯火焰清理产生的裂纹，经热轧变形后仍有大部分不能焊合，因此，避免或减少钢坯清理后的裂纹产生是极为重要的。     

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.