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| Effect of the fine Cr-Fe alloy powder on the microstructure and properties of powder metallurgy steels |
| MOU Nan1, LEI Long-lin2, XU Ran1, TANG Lin2, LUO Feng-hua1 |
1. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
2. Ningbo FOTILE Kitchen Ware Co. Ltd., Ningbo 315336, China |
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Abstract The Fe-Cr-Mo PM steel was obtained from the mixed FeCr55C600 high carbon ferrochrome powders with a mean particle size of 4.65 μm and the Fe-0.5Mo water atomized pre-alloyed powders, sintered at 1 200℃ by sinter hardening process. The results indicate that the hardness and strength of the sintered alloys increase as the content of Cr-Fe alloy powder increasing. The microstructure of the sintered specimens is mainly composed of bainite. When adding ultrafine Cr-Fe alloy powder, leading to the Cr mass content of 1.7%, Fe-Cr-Mo PM steels have optimal properties, with tensile strength of 1 210 MPa and hardness of 30 HRC. Main microstructure of the alloy is a mixture of fine lower bainite and martensite, and mass ratio of the alloy element of Cr/C is about 1.54.
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Received: 15 September 2014
Published: 29 April 2015
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| [1] Bruce Lindsley. Sintering of chromium containing PM steels processed to high density[J]. Advances in Powder Metallurgy & Particulate Materials, 2008: 150-160.[2]London Metal Exchange. LME Daily Metals Report[EB/OL]. 2007[2012-12-25]. http://www.lme.com/metals/non-ferrous/.[3] Robert Frykholm，Ola Bergman. Chromium Prealloyed PM Steels Suitable for High-Performance Applications[J]. ADVANCES IN POWDER METALLURGY AND PARTICULATE MATERIALS, 2005, 3: 10.[4] Sigurd Berg，Barbara Maroli. Properties obtained by chromium-containing material[J]. Advances in Powder Metallurgy and Particulate Materials, 2002, (8): 8-1.[5] Robert Frykholm. Chrome is good in high strength PM applications[J]. Metal Powder Report, 2007, 62(11): 18-21.[6] Joseph M Capus. PM Chromium steels: ready for mass production[J]. Metal Powder Report, 2002, 57(2): 22-23.[7] 向道平，唐建新. Cr/C 比及热处理工艺对高铬铸铁抗磨粒磨损性能的影响[J]. 热加工工艺, 2004, (5): 21-24.[8] 王久彬，李庆春. 高铬白口铸铁的高温性能[J]. 铸造, 1994, (2): 25-28.[9] 苏勇，付广艳，刘群，等. 不同方法制备的 Cu-Si 合金的高温氧化行为[J]. 特种铸造及有色合金, 2007, 27(8): 647-650[10] 孙淼. 纳米晶 304 不锈钢腐蚀行为的研究[D]. 沈阳工业大学, 2010.[11] 周善初，李松瑞. 金属热处理[M].长沙：中南大学出版社，2005.[12] 张林祥，罗丰华，李国平，等. 预扩散处理Cr-Fe粉对铁基合金组织与性能的影响[J]. 粉末冶金技术，2013,31（2）：101-107.[13] 汪瑞俊,杜晓东,孙国栋等.铬含量对Cr-Ni-Mo系低碳合金钢组织性能的影响[J].热加工工艺,2007,36(8):15-17. |
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2015, Vol. 25 
