Abstract: The thermal stability and microstructure evolution of a new die casting steel containing 1% (mass fraction) nickel and without nickel were comparatively studied. Two kinds of steels were quenched in the same process, following by several times of tempering to achieve similar hardness. The thermal stability experiment of the materials was carried out at 600 ℃. SEM (scanning electron microscopy) and TEM (transmission electron microscopy) were employed to compare the microstructure evolution of the two materials during the thermal stability test, in order to explore the effect of Ni on microstructure of the material. The results showed that in the process of austenitizing, Ni retarded the dissolution of carbides, and the undissolved carbides at the grain boundaries prevented the growth of the austenite effectively, so that the quenching temperature could be increased. When quenched at the same temperature, the carbides in SDYZ1 could not dissolve in the matrix adequately, which reduced the precipitation strengthening effect of secondary carbides, and then resulting in a sharp decline of the hardness in the early stage of the thermal stability experiment. The advantage of Ni to improve the thermal stability of the material may need to be reflected at a much higher quenching temperature.
曾艳, 吴晓春, 夏书文, 左鹏鹏. 镍元素对新型压铸模具钢热稳定性的影响*[J]. 《材料导报》期刊社, 2017, 31(16): 72-75.
ZENG Yan, WU Xiaochun, XIA Shuwen, ZUO Pengpeng. Influence of Ni on the Thermal Stability of a New Die Casting Steel. Materials Reports, 2017, 31(16): 72-75.
1 Wu Xiaochun, Zuo Pengpeng. Development status and trend of hot working die steels at home and abroad[J]. Die Ind,2013,39(10):1(in Chinese). 吴晓春,左鹏鹏. 国内外热作模具钢发展现状与趋势[J]. 模具工业,2013,39(10):1. 2 Wang Jianxing. The effect of Ni content on structure and property of stainless steel[D]. Chongqing: Chongqing University,2010(in Chinese). 王剑星. Ni含量对0Cr17Ni4Cu4Nb不锈钢组织与性能的影响[D]. 重庆: 重庆大学,2010. 3 Medvedeva A, Bergström J, Gunnarsson S, et al. Influence of nickel content on machinability of hot-work tool steel in prehardened condition[J]. Mater Des,2011,32(2):706. 4 He Xuesong, Zuo Pengpeng, Wu Xiaochun. Effect of Ni on continuous cooling transformation characteristic of new type die-casting steels[J]. J Mater Heat Treatment,2015,36(10):134(in Chinese). 何雪松, 左鹏鹏, 吴晓春. Ni对新型压铸模具钢连续冷却转变规律的影响[J]. 材料热处理学报,2015,36(10):134. 5 Li Ping’an, Gao Jun. Study on heat stability of hot die steels[J]. Heat Treatment Metals,1997(12):10(in Chinese). 李平安, 高军. 热作模具钢的热稳定性研究[J]. 金属热处理,1997(12):10. 6 Ji Tianyu, Wu Xiaochun. Thermal stability mechanism of a new hot working die steel SDH3-Mod[J]. Mater Sci Technol,2014,22(6):29(in Chinese). 计天予,吴晓春. 新型热作模具钢SDH3-Mod的热稳机理研究[J]. 材料科学与工艺,2014,22(6):29. 7 Armas A F, Petersen C, Schmitt R, et al. Mechanical and microstructural behaviour of isothermally and thermally fatigued ferritic/martensitic steels[J]. J Nucl Mater,2002,307-311:509. 8 He Xuesong. Effect of nickel on continuous cooling transformation,properties and microstructure of new type die-casting steels[D]. Shanghai: Shanghai University,2016(in Chinese). 何雪松. 镍对新型压铸模具钢连续冷却转变行为及性能与组织的影响研究[D]. 上海:上海大学,2016. 9 Xie Changsheng, Sun Peizhen, Qiao Xueliang, et al. The proerties of hot-work die steels containing manganese and nickel with high heat stability[J]. Hot Working Technol,1992(3):19(in Chinese). 谢长生,孙培祯,乔学亮,等. 含Mn-Si高热稳定性热作模具钢的性能[J]. 热加工工艺,1992(3):19. 10 Oi K, Lux C, Purdy G R. A study of the influence of Mn and Ni on the kinetics of the proeutectoid ferrite reaction in steels[J]. Acta Mater,2000,48(9):s2147. 11 Li Jingyuan, Chen Yulai, Huo Jianhua. Mechanism of improvement on strength and toughness of H13 die steel by nitrogen[J]. Mater Sci Eng A,2015,640:16. 12 Zhou Qingchun, Wu Xiaochun, Shi Nannan, et al. Microstructure evolution and kinetic analysis of DM hot-work die steels during tempering[J]. Mater Sci Eng A,2011,528(18):5696. 13 Johnny Sjöström. Chromium martensitic hot-work tool steels-da-mage, performance and microstructure[D]. Sweden: Karlstad University,2004. 14 Kapoor R, Lalit Kumar, Batra I S. A dilatometric study of the continuous heating transformations in 18wt% Ni maraging steel of grade 350[J]. Mater Sci Eng A,2003,352(1-2):318. 15 Ruitenberg G, Woldt E, Petford-long A K. Comparing the Johnson-Mehl-Kolnogorov equations for isothermal and linear heating conditions[J]. Thermochim Acta,2001,378(1-2):97. 16 Babu S S, et al. APFIM studies on martensite tempering of Fe-C-Si-Mn low alloy steel[J]. Appl Surf Sci,1993,67(1-4):321. 17 Zhou Qingchun, Wu Xiaochun, Min Yongan, et al. Mechanism of Si in the high silicon martensitic hot working die steel[J]. Mater Sci Technol,2010,18(6):772(in Chinese). 周青春,吴晓春,闵永安,等. 硅在高硅马氏体型热作模具钢中作用机理研究[J]. 材料科学与工艺,2010,18(6):772.
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2017, Vol. 31 
