共查询到20条相似文献,搜索用时 93 毫秒
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针对W18Cr4V钢钻头因碳化物偏析严重、常存在大颗粒碳化物而导致其冲击性能和热疲劳性能较差等问题,采用不同的退火温度和淬火工艺对含钇W18Cr4V钢钝化机钻头进行了热处理,并通过SEM、冲击试验和热疲劳试验进行显微组织、冲击性能和热疲劳性能的分析。结果表明:随退火温度提高,W18Cr4V钢钻头的冲击性能和热疲劳性能均先提高后下降;分级淬火更有利于提高钻头的冲击性能和热疲劳性能,含钇W18Cr4V钢钝化机钻头的退火温度优选为900℃、淬火工艺优选为1 450℃×10 min+1 250℃×20 min分级淬火。 相似文献
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本试验研究了不同淬火和回火工艺热处理对Cr12MoV钢组织、硬度和磨损性能的影响。实验结果表明:当在1050~1100℃范围内淬火、520℃回火时,得隐针马氏体+少量残余奥氏体组织,材料硬度与耐磨性均较好;当在1100℃淬火,各温度二次回火硬度均较一次回火高,当在550℃回火时,试验钢实现二次硬化,且残余奥氏体大量转变,硬度和耐磨性达最大值,材料性能最优。 相似文献
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为满足12Cr1MoV钢管最终热处理制度要求,采用950℃淬火或控制终轧温度(≥950℃)代正火加回火的热处理工艺.介绍了12Cr1MoV高压锅炉管的冶炼、轧管及试验室热处理工艺试验,并按照GB5310-85要求进行了全面性能测试.试验结果表明,成品管采用控制终轧温度(≥950℃)加回火及淬火加回火的工艺,钢管的常规性能均符合标准要求. 相似文献
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研究了淬火温度1025~1125℃+570℃4 h空冷+720℃2 h空冷和1050~1075℃淬火后二次回火温度680~780℃对马氏体耐热钢X12CrMoWVNbN10-1-1(%:0.11C、10.28Cr、0.77Ni、1.0Mo、0.96W、0.18V、0.04Nb、0.053N)力学性能的影响。结果表明,随淬火温度的提高,钢的强度增加,塑性变化不大,但冲击韧性显著下降。随回火温度的提高,强度下降、塑性、韧性增加。该钢优化的热处理工艺为:1 050~1 075℃1~2 h油冷+570℃4 h空冷+715~725℃2 h空冷。 相似文献
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探讨了不同热处理工艺对12Cr2Mo1R耐热钢板性能和组织的影响,结果表明:随正火温度的升高贝氏体增加,强度提高,975℃正火后,显微组织为100%贝氏体和(Fe,Cr)3C型渗碳体;随回火温度的提高及回火时间的延长,强度降低,600℃回火时析出的纳米强化相不断长大成针状,同时,(Fe,Cr)3C型渗碳体不断球化,逐渐向(Fe,Cr)7C3型转化;正火处理后再经650℃回火处理,负蠕变现象消失。生产中12Cr2Mo1R钢宜采用正火+回火处理,正火温度920~950℃,保温时间1.5~3.0 min/mm;回火温度720~750℃,保温时间2.0~4.0 min/mm。 相似文献
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为了解决2Cr12NiMo1W1V钢短时持久性能低的问题,采用OIM、SEM、TEM等手段研究了不同淬火和回火工艺下超超临界叶片用2Cr12NiMo1W1V马氏体耐热钢的组织、室温力学性能及短时持久性能。结果表明,随着淬火温度的提升,抗拉强度和冲击吸收功略有增加,屈服强度和硬度呈降低趋势,塑性变形不明显,合金的持久性能显著增加。2Cr12NiMo1W1V优化的热处理工艺为1 038 ℃淬火+675 ℃回火,合金的强韧性和持久性能较好。微观组织分析表明,提高淬火温度,合金中的大颗粒M23C6的碳化物更多固溶到基体中,并在回火过程中大量析出细小的M23C6相,减少了短时持久过程中裂纹起源,阻碍位错运动,使合金抵抗高温变形的能力增加,改善了合金的持久性能。 相似文献
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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。 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