低预合金粉烧结硬化能力的探讨
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摘要
低预合金粉烧结硬化工艺是将烧结与热处理合为一道工序的工艺,可以缩短生产周期和降低成本,同时低合金也可降低淬透性。主要研究了某公司生产的1300WA(0.5Mo-1.8Ni)及5301SH(0.5Ni-0.9Mo-0.38Mn)两种烧结硬化粉混入不同含量Cu和C后,在冷却速率为0.56～1.94℃/s范围内的硬化能力。结果表明:两种材料内的马氏体含量随着冷却速率的提高而明显增加,烧结硬化能力随Cu含量的增加而明显提高。当Cu质量分数大于1.5%,冷却速率高于1.61℃/s时,5301SH烧结后可以得到几乎全部马氏体相;而1300WA需要在Cu质量分数大于2.0%,且冷却速率达到1.94℃/s时达到类似效果。
The sinter hardening process of low pre-alloyed powder is a process combining sintering and heat treatment,which can shorten the production cycle and reduce the cost,and at the same time,low alloy can also reduce hardenability. The hardening ability of 1300 WA(0.5 Mo-1.8 Ni)and 5301 SH(0.5 Ni-0.9 Mo-0.38 Mn)sintered powders produced by some company,after mixing Cu and C with different contents was studied in the cooling rate range of 0.56-1.94 ℃/s.The results show that the martensite content in the two materials obviously increases with the increase of cooling rate,and the sintering hardening ability obviously increases with the increase of Cu content. When the mass percent of Cu is more than 1.5% and the cooling rate is higher than 1.61 ℃/s,almost full of martensite phase is obtained in 5301 SH.However,1300 WA has the similar effect when the Cu mass percent is greater than 2.0% and the cooling rate reaches1.94 ℃/s.
The sinter hardening process of low pre-alloyed powder is a process combining sintering and heat treatment,which can shorten the production cycle and reduce the cost,and at the same time,low alloy can also reduce hardenability. The hardening ability of 1300 WA(0.5 Mo-1.8 Ni)and 5301 SH(0.5 Ni-0.9 Mo-0.38 Mn)sintered powders produced by some company,after mixing Cu and C with different contents was studied in the cooling rate range of 0.56-1.94 ℃/s.The results show that the martensite content in the two materials obviously increases with the increase of cooling rate,and the sintering hardening ability obviously increases with the increase of Cu content. When the mass percent of Cu is more than 1.5% and the cooling rate is higher than 1.61 ℃/s,almost full of martensite phase is obtained in 5301 SH.However,1300 WA has the similar effect when the Cu mass percent is greater than 2.0% and the cooling rate reaches1.94 ℃/s.
引文
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[2] Michael C B,Philip J W,Thomas E H,et al.先进的烧结-硬化材料在汽车齿轮·凸轮及链轮等中的应用[J].亓家钟,译.粉末冶金工业,2010,20(5):13.
[3]赵欣,刘荣明,朱代漫,等.混合、烧结及制粉工艺对压延铁氧体性能的影响[J].金属功能材料,2018,25(5):33.
[4]韩凤麟.粉末冶金铁基零件的烧结-硬化处理[J].粉末冶金工业,2014,24(1):1.
[5]牟楠,雷龙林,徐然,等.微细Cr-Fe合金粉对粉末冶金钢组织与性能的影响[J].粉末冶金工业,2015,25(2):25.
[6]彭元东,易健宏,梁超平,等.低合金钢烧结硬化性能研究[J].材料开发与应用,2008,23(2):1.
[7]徐信,韩云娟,牛森,等.适用于工业制造的烧结硬化解决方案[J].粉末冶金工业,2016,26(3):78.
[8] Klein A N,Furlan K P,Schroeder R M,et al. Thermodynamic aspects during the processing of sintered materials[J]. Powder Technology,2015,271:193.