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利用Gleeble-3800热模拟试验机对低合金高强度结构钢Q345E在1150~800℃之间的奥氏体动态再结晶及动态相变行为进行研究。确定了试验钢Q345E奥氏体动态再结晶的临界应变条件;研究了变形温度、应变速率等变形条件对试验钢奥氏体动态再结晶的影响,通过高温热力学模拟试验得到了Q345E钢在不同变形条件下的流动应力曲线,得出了动态再结晶激活能为467.767kJ/mol,通过对实验数据的拟合回归分析,建立了动态再结晶热变形模型和峰值应力、峰值应变与Z因子的关系,为控制该钢的组织和性能提供了基本依据。 相似文献
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摘要: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1050~1200℃和应变速率为0.01~10s-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1050~1200℃和应变速率为1.0~10s-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001s-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。 相似文献
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《钢铁研究学报》2021,(7)
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。 相似文献
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采用MMS-200热力模拟试验机,在变形温度950 ~1200℃以及变形速率0.01~10 s-1条件下对0.07C-0.85Mn-0.16S-0.05Bi钢进行一系列热压缩实验.结果 表明,实验钢的流变应力曲线呈现明显的动态再结晶特征,并且流变应力随变形温度的提升或者应变速率的下降而降低.根据不同变形条件下的峰值应力,由Arrhenius模型构建了峰值应力下的本构方程,计算实验钢热变形激活能Q并基于动态材料模型绘制真应变为0.1、0.3、0.5、0.7的热加工图.研究分析了实验钢在不同应变下的失稳区域和合理热加工区域,随着应变的增大,失稳区均出现在高速率变形区,且由低温高速率区向高温高速率区转变.最佳热加工参数为变形温度1020~1200℃、变形速率0.01~0.3 s-1. 相似文献
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采用MMS-200热力模拟试验机,在变形温度950 ~1200℃以及变形速率0.01~10 s-1条件下对0.07C-0.85Mn-0.16S-0.05Bi钢进行一系列热压缩实验.结果 表明,实验钢的流变应力曲线呈现明显的动态再结晶特征,并且流变应力随变形温度的提升或者应变速率的下降而降低.根据不同变形条件下的峰值应力,由Arrhenius模型构建了峰值应力下的本构方程,计算实验钢热变形激活能Q并基于动态材料模型绘制真应变为0.1、0.3、0.5、0.7的热加工图.研究分析了实验钢在不同应变下的失稳区域和合理热加工区域,随着应变的增大,失稳区均出现在高速率变形区,且由低温高速率区向高温高速率区转变.最佳热加工参数为变形温度1020~1200℃、变形速率0.01~0.3 s-1. 相似文献
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采用MMS-200热力模拟试验机,在变形温度950 ~1200℃以及变形速率0.01~10 s-1条件下对0.07C-0.85Mn-0.16S-0.05Bi钢进行一系列热压缩实验.结果 表明,实验钢的流变应力曲线呈现明显的动态再结晶特征,并且流变应力随变形温度的提升或者应变速率的下降而降低.根据不同变形条件下的峰值应力,由Arrhenius模型构建了峰值应力下的本构方程,计算实验钢热变形激活能Q并基于动态材料模型绘制真应变为0.1、0.3、0.5、0.7的热加工图.研究分析了实验钢在不同应变下的失稳区域和合理热加工区域,随着应变的增大,失稳区均出现在高速率变形区,且由低温高速率区向高温高速率区转变.最佳热加工参数为变形温度1020~1200℃、变形速率0.01~0.3 s-1. 相似文献
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<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 相似文献
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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, 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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, 相似文献
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《China Nonferrous Metals Monthly》2014,(12)
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. 相似文献
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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. 相似文献
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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. 相似文献