1 Ganzhou Non-ferrous Metallurgy Research Institute,Ganzhou 341000; 2 State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083
Abstract: Properties of traditional H13 steel with 5% Cr and modified H13 steel with 3% Cr were compared, relevant microstructures and phase composition were also investigated using scanning electron microscopy, transmission electron microscopy and X-ray diffraction, and the effect of Cr on the microstructures and properties of H13 steel were studied. The results demonstrated that the tempering resistance and high temperature strength of H13 steel were remarkably enhanced by reducing the Cr content, mainly related to the level of recovery of martensite and the types of precipitates during tempering. When the traditional H13 steel was tempered at 650 ℃, the martensite was almost completely recovered and a large amount of near spherical Cr7C3 and M6C type carbides with a size of about 120 nm were precipitated along the original martensite lath boundaries and grain boundaries, reducing the second phase reinforcement effect. But for the modified H13 steel with 3% Cr, the lath martensite with high dislocation density was still observed after 650 ℃ tempering, and intensive plate-like VC type carbides with a length of about 25 nm and thickness about 2.5 nm were found within the martensite lath. The dispersed VC carbide precipitated during tempering significantly inhibited the recovery of martensite, thus enhancing the high temperature properties.
1 Wang Yanjun, Li Pengwei.Optimization on heat treatment process of H13 steel[J].Heat Treatment,2013,34(2):22(in Chinese). 王彦俊,李鹏伟.H13钢热处理工艺优化[J].热处理,2013,34(2):22. 2 Guimaraes J R C, Branco J R T, Kajita T. Partial substitution of niobium for vanadium in H-13 hot-work tool steel[J].Materials Science Technology,1986,2:1074. 3 Jiang Shiwei,Zhou Guoxing.Heat treatment of especially large-sized H13 steel die[J].Heat Treatment,2015,30(4):41(in Chinese). 蒋世伟,周国星.H13钢特大型模具的热处理[J].热处理,2015,30(4):41. 4 Norstrom L A, Ohrberg N. Thermal-fatigue behaviour of hot-work tool steels[J].Metals Technology,1981,8:22. 5 Wang Ming, Ma Dangshen, Liu Zhentian, et al. Effect of Nb on segregation, primary carbides and toughness of H13 steel[J].Acta Me-tallurgica Sinica,2014,50(3):285(in Chinese). 王明,马党参,刘振天,等.Nb对芯棒用H13钢偏析、液析碳化物及力学性能的影响[J].金属学报,2014,50(3):285. 6 Michaud P, Delagnes D, Lamesle P, et al. The effect of the addition of alloying elements on carbide precipitation and mechanical properties in 5% chromium martensitic steels[J].Acta Materialia,2007,55:4877. 7 Du Zhiwei, Liu Zongchang, Zhu Wenfang, et al.Study on the phase transformation of H13 steel during quenching and tempering[J].Journal of Baotou University of Iron and Steel Technology,2001,20(1):34(in Chinese). 杜志伟,刘宗昌,朱文方,等.H13钢淬火、回火过程中相变的研究[J].包头钢铁学院学报,2001,20(1):34. 8 Mebarki N, Delagnes D, Lamesle P, et al. Relationship between microstructure and mechanical properties of a 5% Cr tempered martensitic tool steel[J].Materials Science and Engineering A,2004,s387-389:171. 9 Delagnes D, Lamesle P, Mathon M H, et al. Influence of silicon content on the precipitation of secondary carbides and fatigue properties of a 5%Cr tempered martensitic steel[J].Materials Science and Engineering A,2005,394:435. 10 Kayser F, Cohen M. Carbides in high-speed steel-their nature and quantity[J].Metal Progress,1952,61(6):79. 11 Lee K B, Yang H R, Kwon H. Effects of alloying additions and austenitizing treatments on secondary hardening and fracture behavior for martensitic steels containing both Mo and W[J].Metallurgical & Materials Transactions A,2001,32(7):1659. 12 Irani J J, Honeycomb R W K. Clustering and precipitation in iron-molybdenum-carbon alloys[J].Journal of Iron and Steel Research, International,1966,203:826. 13 Kwon H, Lee K B, Yang H R, et al. Effect of alloying additions on secondary hardening behavior of Mo-containing steels[J].Metallurgical & Materials Transactions A,1997,28:775. 14 Zhou Q C, Wu X C, Shi N N, et al. Microstructure evolution and kinetic analysis of DM hot-work die steels during tempering[J].Materials Science and Engineering. A,2011,528(18):5696. 15 Kuo K. Alloy carbides precipitated during the fourth stage of tempering[J].Journal of Iron and Steel Research, International,1956,184:258. 16 Baker R G, Nutting J J. The tempering of 2.25Cr%-1%Mo steel after quenching and normalizing[J].Journal of Iron and Steel Research, International,1959,202:257. 17 Smith E. An investigation of secondary hardeningof a 1% vanadium-0.2% carbon steel[J].Acta Metallurgica,1966,14:583. 18 Wang R, Dunlop G L. The crystallography of secondary carbide precipitation in high speed steel[J].Acta Metallurgica,1984,32(10):1591.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2018, Vol. 32 
