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作 者:王翔[1] 罗丰华[1,2] 袁勇 高翔[1] 周立岩[1] 崔建民
机构地区:[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]莱芜钢铁集团粉末冶金有限公司,莱芜271105
出 处:《粉末冶金材料科学与工程》2011年第6期875-880,共6页Materials Science and Engineering of Powder Metallurgy
基 金:国家科技支撑计划项目(2009BAE74B02);湖南省博士后科学基金资助项目(2009RS3027);粉末冶金国家重点实验室创新基金资助项目(200902)
摘 要:在惰性气体雾化法制备的Fe-1.1Ni-0.5Mo-0.5Cr预合金粉末中添加1.5%的Cu粉和0.6%的C粉(均为质量分数)以及还原铁粉(添加量分别为0、10%、20%和30%),混合均匀后在600 MPa压力下模压,在1 180℃烧结1 h。烧结合金经180℃/1 h回火处理后,进行密度、硬度、拉伸力学性能检测以及显微组织观察。结果表明,添加还原铁粉后,合金的密度和强度大幅度提高,并保持高硬度状态。金相组织主要为回火马氏体组织,并随还原铁粉添加量增加,出现一定量的珠光体、下贝氏体以及上贝氏体组织。在添加20%还原铁粉时合金的综合性能最好,密度为6.85 g/cm3,硬度达到43 HRC,抗拉强度为650 MPa。添加还原铁粉有利于粉末压制成形以及提高合金的力学性能。The pre-alloyed Fe-1.1Ni-0.5Mo-0.5Cr powder was prepared by inactive gas atomization. The mixtures were prepared with 0.5% wax as lubricant and 0.6% graphite, 1.5% copper (all in mass fraction) as additives. Then the pre-alloyed powder was homogeneously mixed with the mixture and respectively adding 0%, 10%, 20% and 30% reductive iron powder, and followed by pressing at 600 MPa and sintering in H2 atmosphere at 1 180℃ for 1 hour. Finally the sintered alloys were tempered at 180 ℃ for 1 hour. The density, hardness and tensile properties of the tempered alloys were detected. Their microstructure and fractography morphology were analyzed. The results show that the density and tensile strength of the sintered alloys increase greatly while their hardness keep at high values; the alloys have good sinter hardening property, martensite is the basic microstructure of sintered alloys, meanwhile pearlite, lower bainite and even upper bainite are appeared in their microstructure with the increasing of reduced iron powder; the sintered alloy added with 20% reduced iron powder has the best synthesis performance, such as the hardness and tensile strength reach 42 HRC and 635 MPa respectively at density 6.84 g/cm3. The above results indicate that the powder forming property and mechanical property could be improved by the addition of reduced pure iron powder.
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