IF钢罩式退火过程中再结晶组织与织构的演变

研究了IF钢(/%:0.005C、0.02Si、0.16Mn、0.011P、0.004S、0.042Als、0.061Ti、0.003 1 N)0.8 mm冷轧板在500～800℃退火时的再结晶组织及织构,采用X射线衍射技术结合微观组织观察分析了IF钢罩式退火过程中{111}再结晶织构形成机制和显微组织演变规律。结果表明,随退火温度的升高,再结晶数量逐渐增多,640℃为实验钢实际再结晶温度,同时{111}再结晶织构强度亦逐渐增大,{111}取向的晶粒主要在再结晶过程中形成,并在{111}取向晶粒长大过程中,γ纤维织构之间也发生相互转化,主要由{111}〈112〉织构转变为{111}〈110〉织构。     

Ti、Nb对超低碳Cr18铁素体不锈钢冷轧板再结晶织构的影响

研究了添加Ti、Nb对超低碳Cr18铁素体不锈钢冷轧板再结晶织构的影响。试验结果表明,Nb单稳定化和Ti、Nb双稳定化的冷轧板试样在850℃下,随退火保温时间的延长,{111}面织构取向密度增加,而Ti单稳定的冷轧板在退火2min时{111}面织构取向密度值达到最大,然后随保温时间延长{111}面织构密度下降。Ti、Nb双稳定化的冷轧板经退火360s后得到最大的{111}<112>织构取向密度强度,Nb单稳定化Cr18不锈钢冷轧板再结晶织构{111}取向密度低于其它两种钢。     

冷轧Ti-IF超深冲钢罩式退火机理及织构变化规律的研究

在480~750℃条件下,模拟罩式退火,利用光学显微镜、X射线衍射和金相显微硬度计研究了冷轧Ti-IF超深冲钢晶粒结构的变化,通过取向密度函数分析了再结晶过程织构演变规律。研究表明:冷轧Ti-IF超深冲钢的再结晶温度约为630℃,再结晶过程能够在660℃条件下2 h之内完成;冷轧后该钢主要有4种织构,分别是{001}〈110〉、{111}〈110〉、{111}〈112〉和{112}〈110〉;在退火再结晶过程中,{111}逐渐转变为γ-{111},当退火温度升至720℃时,{001}〈110〉和{112}〈110〉转变为纤维织构γ-{111},最终{111}〈110〉和{111}〈112〉成为主要织构类型。     

退火工艺对DC04汽车板再结晶组织和织构的影响

以酒钢CSP工艺DC04冷轧汽车板为原料,通过实验室模拟退火工艺,采用OM、EBSD、ODF技术,研究退火工艺对其组织和织构特征的影响。结果表明,DC04汽车板退火组织为铁素体和少量渗碳体,575℃退火1h再结晶开始,730℃退火1h后再结晶较为充分,并随着退火时间的延长,铁素体晶粒长大。不同压下率的DC04冷轧板和退火板中,主要织构均为bcc金属中典型的α(<110>//RD)纤维织构和γ（<111>//ND）纤维织构。随着压下率增加,{111}<112>织构的取向密度明显大于{111}<110>织构的取向密度。730 ℃退火后,低压下率67%的退火板织构中有微弱的{001}<110>取向,但随着压下率增大,这种织构逐渐消失,而形成较强的{111}<112>、{111}<110>有利织构。增加变形量有利于获得有利的{111}织构而抑制不利{001}织构的生成,从而提高DC04的深冲性能。     

济钢ASP线Ti-IF钢析出相及织构演变分析

采用化学相分析及透射电镜(TEM),对ASP线生产的Ti-IF钢析出相进行了定性和定量的研究,并利用ODF分析方法,揭示了生产过程中Ti-IF钢的织构演变规律.结果表明:析出相主要由TiN、Ti2CS、Ti(C,N)和FeTiP粒子组成.热轧后即发现少量FeTiP粒子,呈球状或椭球状,大小在100nm以下.冷轧过程是深冲织构{111}<110>和{111}<112>形成的重要阶段.冷轧织构由较强的α和γ纤维织构组成.退火过程中,γ织构不断增强同时伴随着α织构的不断减弱,最终形成了沿γ纤维的{111}再结晶织构.     

430不锈钢冷轧板高温退火过程中再结晶织构的定量分析

在750、800、825和850℃温度下,利用Gleeble1500热模拟试验机对430不锈钢冷轧薄板的等温退火过程进行了详细的实验研究,分析了退火过程中再结晶织构和组织的变化规律,并对关键织构体积分数的演变进行了定量分析.结果发现:随着退火过程的进行,α取向线上的织构强度逐渐减弱,而γ取向线上的织构强度则略有加强,并保持在较高的值;再结晶过程中,{111}和{112}<110>织构的体积分数逐渐降低,而{100}和随机取向晶粒的体积分数逐渐增加.定量分析表明,退火温度越低,完全再结晶后材料内部关键织构的体积分数越偏离冷轧态.最后,针对{111}、{112}<110>、{100}和随机取向织构的体积分数在再结晶过程中的演变规律,建立了JMAK型再结晶织构演变动力学模型.      

50W600 冷轧无取向电工钢退火过程组织和织构取向的演变

通过金相和电子背散射衍射法(EBSD)研究50W600冷轧无取向电工钢(0.003%～0.008%C、0.3%Si)在700～760℃3～360 s退火水冷时的组织和织构取向演变.结果表明,随退火温度的提高,钢的再结晶率和晶粒尺寸增大,740℃退火时,当保温时间由10 s增加至360 s,再结晶率由22.5%提高到100%,平均晶粒尺寸由3.08μm增大至17.17 μm.同时再结晶织构a线的取向密度下降,在15 8时{001}<110>、{112}<110>、{111}<110>、{110}<110>的取向密度均为1.5左右,y线上{111}<011>和{111}<112>的取向密度稳定在0.25左右.     

快速加热条件下BH钢再结晶规律

 通过Gleeble-3500热模拟试验机以及运用金相、显微硬度、EBSD技术等研究方法,研究了不同加热速率对BH钢再结晶退火组织和织构演变的影响。结果表明：再结晶温度随加热速率的提高而升高。加热速率的提高,缩短了BH钢完成再结晶所需时间。快速加热条件下,BH钢再结晶晶粒得到细化,再结晶织构组分强度降低。EBSD分析发现：提高加热速率,再结晶完成后,再结晶织构仍以有利于深冲性能的管状γ织构为主。再结晶结束后,升高温度和增加保温时间有助于{111}织构的发展。在780℃保温一定时间的条件下,低加热速率形成以{111}〈112〉组分为主的再结晶织构,而快加热速率下{111}〈110〉织构组分得到一定的发展,γ织构强度分布更加均匀,有利于BH钢的成型性能。     

冷轧压下率对IF钢组织织构和性能的影响

以工业生产的热轧板为原料,研究了冷轧压下率对罩式退火后的Ti-IF钢和Ti＋Nb-IF钢组织织构和性能的影响。研究结果表明,经罩式退火后,两种IF钢再结晶基本完成,晶粒呈饼状;随着压下率的增加,晶粒尺寸变小;应变硬化指数n90&#176;值逐渐降低。Ti＋Nb-IF钢塑性应变比r90&#176;值在碳含量较高、压下率为70%,或碳含量较低、压下率为80%时,达到最大值;Ti-IF钢塑性应变比r90&#176;值在压下率70%时,达到最大值。随着冷轧压下率的加大,IF钢的织构也越强,并且织构从较低冷轧压下率时的{223}〈110〉、{114}〈110〉和{111}织构变为较高压下率时的{223}〈110〉、{111}〈110〉和{114}〈110〉织构,织构类型有向{111}织构靠拢的趋势。     

Ti-IF钢析出物行为与织构研究

研究了Ti-IF无间隙原子钢热轧、冷轧、退火(700、800℃)过程的析出行为与织构.该钢在700℃退火过程中形成的FeTiP析出颗粒降低了{111}织构强度,导致r值降低;而800℃退火过程中形成的析出颗粒提高{111}织构强度,强的{111}织构强度增加r值.700℃退火析出物主要为FeTiP,800℃退火析出物主要为Ti4C2S2;由于形成Ti4C2S2析出物,使C在再结晶退火过程中很容易从固溶体中析出而形成{111}织构,促使800 ℃退火时获得良好的成型性.     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

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.