Abstract The soft magnetic material of pure iron was prepared by powder metallurgy method, and then hot forging was carried out. The density and magnetic properties of the forgings at different forging temperatures and pressures were tested, the microstructure was detected and the optimal forging process of pure iron soft magnetic material of powder metallurgy was obtained. The results show that the density and magnetic properties of the forgings can be improved effectively by increasing the forging pressure and forging temperature. With the increase of forging pressure, the saturation magnetization Ms increases and the coercivity Hc decreases and then increases. With the increase of forging temperature, both Ms and Hc increase. The density and relative density of pure iron soft magnetic material are 7.821 g/cm and 99.38% respectively, Ms=2.024 T and Hc=997.3 A/m, at forging temperature and pressure of 1 200 ℃ and 1 166 MPa. After annealing at 1 450 ℃, the Hc of forgings decreases to 437.0 A/m.
XIN Lijun,JIANG Limin,ZHANG Guang’an, et al. Effect of forging on magnetic properties of powder metallurgy pure iron soft magnetic materials[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(4): 334-339.
[1] 董国强, 秦明礼, 章林, 等. 高速压制制备高密度纯铁软磁材料[J]. 工程科学学报, 2016, 38(5): 677. DONG Guoqiang, QING Mingli, ZHANG Lin, et al.Preparation of high-density iron soft magnetic materials by HVC technology[J]. J Chin Jou of Engin, 2016, 38(5): 677. [2] 杜伟. 纯铁软磁金属粉末注射成形工艺研究[D]. 武汉: 华中科技大学, 2007. DU Wei.Process research on metal powder injection molding of pure iron soft magnet[D]. Wuhan: Huazhong University of Science & Technology, 2007. [3] 李元元, 项品峰, 徐峥, 等. 温压技术中的致密化机制[J]. 材料科学与工程, 2001, 19(1): 39-40. LI Yuanyuan, XIANG Pinfeng, XU Zheng, et al.The densification mechanism of warm compaction technology[J]. J Materials Science & Engineering, 2001, 19(1): 39-40. [4] 陈付时. 纯铁系软磁材料[J]. 上海钢研, 2003(3): 19-21. CHEN Fushi.Pure iron soft magnetic material[J]. J Shanghai Iron & steel Research, 2003(3): 19-21. [5] CHENG Y, SHEN D Z.Research on combined hot extrusion forming extrusion process of altemator plA/ms[J]. J Materials Science and Chemical Engineering, 2013(1): 16-18. [6] 张华诚. 粉末冶金实用工艺学[M]. 北京: 冶金工业出版社, 2004: 35-37. ZHANG Huacheng.Practical Technology of Powder Metallurgy[M]. Beijing: Metallurgical Industry Press, 2004: 35-37. [7] 左鹏军, 王海文. 铁基粉末冶金液压马达阀板的研究与制备[J]. 粉末冶金技术, 2017, 35(6): 434-438. ZUO Pengjun, WANG Haiwen.Development and preparation of Fe-based powder metallurgy valve plate used in hydraulic motor[J]. Powder Metallurgy Technology, 2017, 35(6): 434-438. [8] CHRISTIAN K, GERHARD H.Eddy-current computation in the claws of a synchronous claw-pole alternator in generator mode[J]. IEEE Transaction on Magnetics, 2002, 38(2): 50-53. [9] 苗晓, 光红兵. 无取向硅钢中夹杂物的影响机理及控制方法的探讨[J]. 太钢科技, 2005(1): 41-43. MIAO Xiao, GUANG Hongbing.Influence mechanism and control method of inclusions in non oriented silicon steel[J]. J Technology of Taiyuan Iron, 2005(1): 41-43. [10] 李念辛, 李森蓉. 我国铁基粉末冶金锻造技术的发展[J]. 粉末冶金技术, 1996, 14(1): 58-60. LI Nianxin, LI Senrong.Development of iron based powder metallurgy forging technology in China[J]. Powder Metallurgy Technology, 1996, 14(1): 58-60. [11] 李明怡, 果世驹, 林涛, 等. 铁粉特性对温压生坯密度的影响[J]. 粉末冶金技术, 2000, 18(3): 172-175. LI Mingyi, GUO Shiju, LIN Tao, et al.Influence of iron powder characteristics on the density of warm and pressure raw materials[J]. Powder Metallurgy Technology, 2000, 18(3): 172-175. [12] 美国金属学会主编. 金属手册[M]. 第9版. 北京: 机械工业出版社, 1994: 180-185. ASM Handbook Commiltee.Metals Handbook[M]. 9th ed. Beijing: Machinery Industry Press, 1994: 180-185. [13] 张浩瀚, 刘子利, 刘希琴, 等. 润滑剂对Fe基粉末冶金材料温压工艺的影响[J]. 粉末冶金技术, 2017, 35(2): 128-132. ZHANG Haohan, LIU Zili, LIU Xiqin, et al.Effects of lubricants on the warm compaction process of Fe-based powder metallurgy materials[J]. J Powder Metallurgy Technology, 2017, 35(2): 128-132.
2019, Vol. 24 
