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Acta Metall Sin  2019, Vol. 55 Issue (12): 1487-1494    DOI: 10.11900/0412.1961.2019.00147
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Precipitation Mechanism and Thermal Stability of Primary Carbide in Ce Microalloyed H13 Steel
HUANG Yu,CHENG Guoguang(),LI Shijian,DAI Weixing
State Key laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
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HUANG Yu, CHENG Guoguang, LI Shijian, DAI Weixing. Precipitation Mechanism and Thermal Stability of Primary Carbide in Ce Microalloyed H13 Steel. Acta Metall Sin, 2019, 55(12): 1487-1494.

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Abstract  

Ce microalloyed H13 hot die steel is widely used in manufacturing hot extrusion and die casting mold of magnesium-aluminium alloy because of its excellent combination of hot strength and impact toughness. The C content in Ce microalloyed H13 steel is approximately 4% (mass fraction), and the alloy elements content such as Cr, Mo, V et al are about 8%. Therefore, it is easy for primary carbide to precipitate during the solidification of the molten steel due to the segregation of alloy elements. Most researchers study the precipitation mechanism of primary carbide in the two-dimensional perspective. A few people are involved in the three-dimensional morphology of the primary carbide, especially the thermal stability of the primary carbide in the three-dimensional perspective in the Ce microalloyed H13 steel. Therefore, the precipitation mechanism and thermal stability of the primary carbide were systematically studied in this work. First, the SEM and inclusion automatic analysis system were used to analyze the morphology, number density and size of the inclusions in Ce microalloyed H13 steel. The three-dimensional morphology of the primary carbide in sample was observed after electrolyzed in a non-aqueous solution. The voltage was 20 V, the electrolysis time was about 3 min and the electrolyte was composed of 1% tetramethylammonium chloride, 10% acetylacetone, and 89% methanol (volume fraction). Three samples were heated to 1150, 1200 and 1250 ℃ for 1 h to investigate the thermal stability of the primary carbide. Finally, Factsage 7.2 software was used to calculate the precipitation mechanism and thermal stability of the primary carbide. Elemental Ce can effectively react with O, S, P and As elements to form the corresponding Ce-O, Ce-S and Ce-P-As inclusions. There is a huge difference between the two-dimensional and three-dimensional morphologies of the primary carbide, the two-dimensional morphology is strip and the three-dimensional morphology is irregular flake. Ti-V-rich carbide precipitates first, and then acts as the nucleation core of V-rich carbide. When the heating temperature reaches 1250 ℃, the V-rich carbide has completely dissolved, and the Ti-V-rich carbide begins to dissolve. The three-dimensional morphology of the wrapped Ti-V-rich carbide is completely exposed after the V-rich carbide disappears completely. The Ce-O inclusion is formed before solidification, and the primary carbide precipitates at the end of the solidification of molten steel. As the Ce content in molten steel increases, the stability diagram of Ce2O2S and Ce-S increases gradually. The precipitation temperature of Ti-V-rich carbide is approximately 1360 ℃, and the V-rich carbide starts to precipitate at about 1200 ℃. The calculated results are keeping well with the experimental observations. The damage of primary carbide in Ce microalloyed H13 steel can be partly reduced by higher heating temperature, but cannot be completely removed.

Key words:  H13 steel      rare earth      primary carbide      thermal stability      precipitation mechanism     
Received:  06 May 2019     
ZTFLH:  TF769.9  
Fund: National Natural Science Foundation of China(No.51874034)

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00147     OR     https://www.ams.org.cn/EN/Y2019/V55/I12/1487

Fig.1  SEM images of main inclusions in Ce microalloyed H13 steel(a) Ce-O (b) Ce-P-As (c) Ce-O+Ti-V-rich carbide (d) Ce-P-As+V-rich carbide
Primary carbide1~3 μm3~5 μm5~10 μm>10 μmTotal
V-rich3.241.202.321.608.36
Ti-V-rich0.680.080.0400.80
Table 1  Number densities of primary carbide in Ce microalloyed H13 steel (mm-2)
Fig.2  Composition of V-rich carbide
Fig.3  Aspect ratio of V-rich carbide
Fig.4  Low (a) and high (b~d) magnified 3D-morphologies of primary carbide in Ce microalloyed H13 steel
Fig.5  EDS maps of primary carbide in 3D-morphology of Fig.4aColor online
Fig.6  Thermal stabilities of primary carbide in 3D-morphology(a) 1150 ℃ for 1 h (b) 1200 ℃ for 1 h (c) 1250 ℃ for 1 h
Fig.7  Number densities and sizes of primary carbide in 3D-morphology after heat treatment at 1150, 1200 and 1250 ℃ for 1 h
Fig.8  EDS maps of primary carbide in 3D-morphology after heat treatment at 1150 ℃ (a) and 1250 ℃ (b) for 1 h
Fig.9  Equilibrium solidification of Ce microalloyed H13 steel
Fig.10  Stability diagram of the Ce-O-S in Fe-C-Cr-Mo-Ce-O-S system at 1600 ℃ (W—mass fraction of element)
Fig.11  Solidification process of primary carbide
[1] Chang S H, Tang T P, Huang K T. Improvement of aluminum erosion behavior and corrosion resistance of AISI H13 tool steel by oxidation treatment [J]. ISIJ Int., 2010, 50: 569
[2] Maugis P, Gouné M. Kinetics of vanadium carbonitride precipitation in steel: A computer model [J]. Acta Mater., 2005, 53: 3359
[3] Mao M T, Guo H J, Wang F, et al. Effect of cooling rate on the solidification microstructure and characteristics of primary carbides in H13 steel [J]. ISIJ Int., 2019, 59: 848
[4] Ali D, Ali Boutorabi S M, Kheirandish S. Effect of titanium carbide concentration on the morphology of MC carbides in pulsed laser surface alloyed AISI H13 tool steel [J]. Opt. Laser Technol., 2019, 112: 236
[5] Xie Y, Cheng G G, Meng X L, et al. Precipitation behavior of primary precipitates in Ti-microalloyed H13 tool steel [J]. ISIJ Int., 2016, 56: 1996
[6] Jiang Q C, Sui H L, Guan Q F. Thermal fatigue behavior of new type high-Cr cast hot work die steel [J]. ISIJ Int., 2004, 44: 1103
[7] Tang W J, Wu X C. Effect of carbides in 4Cr5MoSiVl steel on thermal fatigue behavior [J]. Heat Treat., 2003, 18: 32
[7] (唐文军, 吴晓春. 4Cr5MoSiV1钢中碳化物对热疲劳性能影响 [J]. 热处理, 2003, 18: 32)
[8] Wang L M, Lin Q, Ji J W, et al. New study concerning development of application of rare earth metals in steels [J]. J. Alloys Compd., 2006, 408-412: 384
[9] Waudby P E. Rare earth additions to steel [J]. Int. Met. Rev., 1978, 23: 74
[10] Yang X H, Wu P F, Wu C C, et al. Behavior of rare earth on modifying inclusion in special steel [J]. J. Chin. Rare Earth Soc., 2010, 28: 612
[10] (杨晓红, 吴鹏飞, 吴铖川等. 特殊钢中稀土变质夹杂物行为研究 [J]. 中国稀土学报, 2010, 28: 612)
[11] Wang L J, Liu Y Q, Wang Q, et al. Evolution mechanisms of MgO·Al2O3 inclusions by cerium in spring steel used in fasteners of high-speed railway [J]. ISIJ Int., 2015, 55: 970
[12] Huang Y, Cheng G G, Xie Y. Modification mechanism of cerium on the inclusions in drill steel [J]. Acta Metall. Sin., 2018, 54: 1253
[12] (黄 宇, 成国光, 谢 有. 稀土Ce对钎具钢中夹杂物的改质机理研究 [J]. 金属学报, 2018, 54: 1253)
[13] Huang Y, Cheng G G, Li S J, et al. Effect of cerium on the behavior of inclusions in H13 steel [J]. Steel Res. Int., 2018, 89: 1800371
[14] Liu H L, Liu C J, Jiang M F. Effect of rare earths on impact toughness of a low-carbon steel [J]. Mater. Des., 2012, 33: 306
[15] Liu X, Yang J C, Yang L, et al. Effect of Ce on inclusions and impact property of 2Cr13 stainless steel [J]. J. Iron Steel Res. Int., 2010, 17: 59
[16] Adabavazeh Z, Hwang W S, Su Y H. Effect of adding cerium on microstructure and morphology of Ce-based inclusions formed in low-carbon steel [J]. Sci. Rep., 2017, 7: 46503
[17] Yan N, Yu S F, Chen Y. In situ observation of austenite grain growth and transformation temperature in coarse grain heat affected zone of Ce-alloyed weld metal [J]. J. Rare Earths, 2017, 35: 203
[18] Yue L J, Han J S, Wang L M. Study on nonmetallic inclusions and pitting corrosion resistance of RE weathering steel [J]. Chin. Rare Earth, 2013, 34(3): 13
[18] (岳丽杰, 韩金生, 王龙妹. 稀土耐候钢中的夹杂物及耐点蚀性能研究 [J]. 稀土, 2013, 34(3): 13)
[19] Yue L J, Wang L L, Wang L M. Influence of rare earth element on the mechanical properties of clean weathering steel [J]. Chin. Rare Earth, 2014, 35(6): 20
[19] (岳丽杰, 汪磊丽, 王龙妹. 微量稀土对洁净耐候钢力学性能的影响 [J]. 稀土, 2014, 35(6): 20)
[20] Wen Z, Yi D Q, Wang B, et al. Effect of rare earths on the recrystallization behavior of T91 heat-resistant steel [J]. J. Univ. Sci. Technol. Beijing, 2013, 35: 1000
[20] (文 智, 易丹青, 王 斌等. 稀土对T91耐热钢动态再结晶行为影响 [J]. 北京科技大学学报, 2013, 35: 1000)
[21] Fu X Y, Yang J C, Jiang X Z, et al. Effects of Ce on the inclusions and impact toughness of T91 heat-resistant steel [J]. Chin. Rare Earth, 2015, 36(5): 60
[21] (富晓阳, 杨吉春, 蒋学智等. Ce对T91耐热钢夹杂物的变质及冲击韧性的影响 [J]. 稀土, 2015, 36(5): 60)
[22] Wang M J, Li Y M, Wang Z X, et al. Effect of rare earth elements on the thermal cracking resistance of high speed steel rolls [J]. J. Rare Earth, 2011, 29: 489
[23] Liu H H, Fu P X, Liu H W, et al. Carbides evolution and tensile property of 4Cr5MoSiV1 die steel with rare earth addition [J]. Metals, 2017, 7: 436
[24] Ali Hamidzadeh M, Meratian M, Saatchi A. Effect of cerium and lanthanum on the microstructure and mechanical properties of AISI D2 tool steel [J]. Mater. Sci. Eng., 2013, A571: 193
[25] Xie Y, Cheng G G, Chen L, et al. Generating mechanism of large heterogeneous carbonitrides with multiple layers in H13+Nb Bar [J]. Steel Res. Int., 2017, 88: 1600119
[26] Xie Y, Cheng G G, Chen L, et al. Characteristics and generating mechanism of large precipitates in Nb-Ti-microalloyed H13 tool steel [J]. ISIJ Int., 2016, 56: 995
[27] Huang Y, Cheng G G, Li S J, et al. Precipitation behavior of large primary carbides in cast H13 steel [J]. Steel Res. Int., 2019, 90: 1900035
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