终轧温度对超纯铁素体不锈钢组织、织构及成形性能的影响

研究了终轧温度对铌、钛双稳定化超纯Cr17铁素体不锈钢的组织演变、织构演变及成形性能的影响。研究结果表明,降低终轧温度能有效细化、均匀化热轧及退火组织。降低终轧温度能增强冷轧退火板的γ纤维再结晶织构、减轻偏离{111}121组分的程度。降低终轧温度是提高r值、降低Δr值、改善冷轧退火板成形性能的有效手段。     

终轧温度对SUS444铁素体不锈钢抗起皱性能的影响

通过金相和EBSD等技术,研究了不同热轧终轧温度对SUS444铁素体不锈钢表面抗起皱性能的影响,讨论了热轧退火板表层所产生{110}001高斯织构的演变过程及其对抗起皱性能的影响。结果表明,860℃的终轧温度有利于SUS444铁素体不锈钢热轧及退火过程中由于受剪切应变而形成的{110}001高斯织构的形成,从而提高后续冷轧退火板表面的抗起皱性能。     

精轧温度对含铌Cr17铁素体不锈钢组织、织构及成形性的影响

 以铌稳定化的Cr17铁素体不锈钢为试验材料,系统研究了精轧温度,即高温精轧和低温精轧,对组织、织构和成形性能的影响。2种不同工艺的热轧板经相同的热带退火、冷轧及退火处理后,分别采用金相显微镜及X射线衍射技术观察2种工艺条件下的组织和织构演变。研究结果表明：与高温精轧相比,低温精轧有利于得到细小及均匀的冷轧退火组织;有利于冷轧退火板形成较强的γ纤维再结晶织构,并消除γ纤维再结晶织构的偏转。因此,低温精轧能够显著提高冷轧退火板的成形性能。     

冷轧工艺对00Cr21MoNbTi铁素体不锈钢组织、织构与成形性能的影响

利用电子背散射衍射技术(EBSD)研究了冷轧轧程和冷轧压下率对00Cr21MoNbTi铁素体不锈钢的组织、织构与成形性能的影响.结果表明:随轧程数的增加,再结晶晶粒尺寸变化不大,但材料的平均r值相应提高;相同两轧程条件下,随累计压下率增大,材料的再结晶晶粒尺寸细化,平均r值以及{111}织构组分含量提高.再结晶织构峰值...     

热轧工艺对409L铁素体不锈钢深冲性的影响

对含有单一柱状晶的409L铁素体不锈钢连铸坯,采用不同终轧温度的热轧工艺,由常规热轧转变为温轧,再经过相同后续工艺;较低终轧温度的成品获得了较高rm值和较低△r值.终轧温度的降低使组织演变发生变化:热轧和冷轧组织中晶界和晶内剪切带增多,变形组织被细化、硬化,尤其是中心层附近的粗大带状晶粒;两者的增多又增加了退火过程中的再结晶形核点,使退火组织细化、均匀化.终轧温度的降低也使织构演变发生变化:热轧及其退火织构由{001～114}(110)向高ρ1和Φ值区域移动;冷轧织构峰值由{001}(110)转移至{335}(110);冷轧退火织构的γ组分增多,峰值由{334}(483)转移至{111}(112),而{001～114}(110)和(0°<Φ<35°,ρ1≈25°)组分减少.     

CSP-CDCM-BA流程钢板组织性能演变规律

 通过低碳铝镇静钢CSP CDCM BA流程的工业试验,借助光学显微镜、X射线衍射仪和专用拉伸试验机等设备,测定了热轧、冷轧、退火和平整后钢板的组织、织构、力学性能和基本成形性能,并对其特征、演变规律及影响因素进行了分析,验证了退火平整板r值的变化与{111}/{100}的线性关系。结果表明,增加{111}和减少{100}织构组分对提高薄钢板成形性能同样重要。     

高纯Cr17铁素体不锈钢热轧板退火温度对冷轧退火板成形性能的影响

研究高纯Cr17铁素体不锈钢的热轧板退火温度对最终冷轧退火板成形性能的影响。对一种铌、钛双稳定化的高纯Cr17铁素体不锈钢的热轧板进行了不同温度的退火试验,随后经相同的冷轧及退火处理,系统研究了其对组织演变、织构演变及成形性能的影响。结果表明:热轧板的退火温度是影响最终板成形性能的重要因素。随着热轧板退火温度的升高,冷轧退火板的晶粒尺寸逐渐增大甚至产生"混晶",γ纤维再结晶织构逐渐减弱,导致r-值减小,Δr值增大,使成形性能恶化。所以,在保证热轧板发生完全再结晶的前提下,退火温度应尽量低。试验钢的热轧板经900℃退火后,冷轧退火板具有最佳的成形性能:r-值高达1.80,而Δr值仅为0.15。     

热轧板初始组织对冷轧无取向硅钢织构演变的影响

研究了27.5 mm热轧板的初始组织(热轧态,850℃退火、950℃退火)对冷轧态和870℃退火的0.5mm冷轧无取向硅钢50W600薄板(/%:0.004C、0.33Si、0.38Mn、0.099P、0.007S、0.32Al)织构演变的影响。结果表明,经冷轧后冷轧板织构中{100}〈011〉和{112}〈110〉织构密度明显增大,末退火热轧板轧成的冷轧板织构密度较退火热轧板轧成的冷轧板强;经未退火热轧板冷轧成的薄板再结晶退火后的织构中主要为{100}〈011〉、{110}〈011〉和{111}〈112〉,退火热轧板冷轧成的薄板再结晶退火后的织构除{100}〈011〉和{110}〈011〉外还有密度较强的高斯织构。     

冷轧压下率对铁素体区热轧Ti-IF钢冷轧板深冲性能的影响

研究了于铁素体区润滑热轧的Ti-IF钢在随后的冷轧及退火工艺中深冲性能的变化.结果表明,在冷轧压下率为75 %时IF钢所获得的r值最高.织构分析表明,于铁素体区润滑热轧的IF钢具有较强的{111}∥ND再结晶织构组分;冷轧时采用75 %的压下率和随后的退火工艺可获得最强的{111}∥ND再结晶织构;冷轧压下率进一步增加时,{111}∥ND再结晶织构将会削弱.这种织构变化与冷轧时ND纤维晶粒内部的剪切带变化有关.     

无取向电工钢冷轧及退火织构的演变

运用不同冷轧、退火工艺的实验及ODF分析方法,分析了电工钢50W600的热轧织构、冷轧织构及再结晶织构的演变.研究表明:热轧带几乎是随机织构,α线非常弱;随着冷轧变形量的提高,晶粒在α线取向附近聚集程度不断提高,变形81%时,{001}《110》和{112}《110》取向密度分别为12和14.随退火温度升高和保温时间延长,α线的取向密度下降,{001}《110》和{112}《110》取向密度急剧降低,γ线{111}《112》密度显著增加,晶粒取向绝大多数聚集在γ线{111}《112》取向附近.通过控制冷轧及退火工艺,可有利于发展高{100}织构组分的冷轧无取向电工钢.     

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.