[1] Zhou Xuefeng, Fang Feng, Tu Yiyou, et al. Carbide refinement in M42 high speed steelby rare earth metals and spheroidizing treatment [J]. Journal of Southeast University (English Edition), 2014, 30 (4): 445-448. [doi:10.3969/j.issn.1003-7985.2014.04.008]

Copy

Carbide refinement in M42 high speed steelby rare earth metals and spheroidizing treatment()

稀土和球化热处理对M42高速钢碳化物尺寸的细化作用

Share：

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

30

Issue:

2014 4

Page:

445-448

Research Field:

Materials Sciences and Engineering

Publishing date:

2014-12-31

Info

Title:

Carbide refinement in M42 high speed steelby rare earth metals and spheroidizing treatment

稀土和球化热处理对M42高速钢碳化物尺寸的细化作用

Author(s):

Zhou Xuefeng^{1, 2}, Fang Feng¹, Tu Yiyou¹, Jiang Jianqing¹, Zhu Wanglong², Yin Songyan³

¹Jiangsu Key Laboratory of Advanced Metallic Materials, Southeast University, Nanjing 211189, China
²Jiangsu Engineering Research Center of Tool and Die Steel, Danyang 212312, China
³Sunnywell New Material Technology Co. Ltd., Changzhou 213200, China

周雪峰^{1, 2}, 方峰¹, 涂益友¹, 蒋建清¹, 朱旺龙², 尹松艳³

¹东南大学江苏省先进金属材料高技术研究重点实验室, 南京 211189; ²江苏省工模具钢工程技术研究中心, 丹阳 212312; ³盛利维尔(中国)新材料技术有限公司, 常州 213200

Keywords:

high speed steel;  rare earth metals;  carbide;  dimension;  spheroidization

高速钢;  稀土;  碳化物;  尺寸;  球化

PACS:

TG142.7

DOI:

10.3969/j.issn.1003-7985.2014.04.008

Abstract:

The influence of rare earth metals and heat treatment on the microstructure and performance of M42 steel has been investigated by means of an optical microscope(OM), scanning electron microscope(SEM), energy dispersive spectroscopy(EDS), transmission electron microscope(TEM), electron back-scatter diffraction(EBSD)and X-ray diffraction(XRD). The results show that M₂C is the prevailing type of eutectic carbides in M42 steel. After modification with rare earth metals, M₂C eutectic carbides change from the ordered lamellar structure into a circular structure. Despite different morphologies, the two carbides present the same characteristics of microstructure and growth orientation. Compared with lamellar carbides, M₂C carbides with the circular structure are much easier to decompose and spheroidize after heating, which remarkably refines the carbide dimensions. The refined carbides improve the supersaturation of alloying elements in martensite and increase the hardness of M42 steel by 1.5 HRC.

采用OM, SEM, EDS, TEM, EBSD, XRD等分析手段, 研究了稀土和热处理对M42高速钢组织和性能的影响规律.结果表明, M₂C是M42高速钢主要的共晶碳化物类型.稀土处理后, M₂C共晶碳化物形貌由规则层片状变为不规则环状.尽管二者形貌差异明显, 但具有相同的微观结构和晶体取向特征.与层片状碳化物相比, 环状M₂C共晶碳化物热稳定性较差, 高温加热时更易发生分解和球化, 使碳化物尺寸明显细化.小尺寸碳化物在淬火加热时易于溶解, 提高了淬火后基体中合金元素的固溶度, 使M42高速钢硬度增加了1.5 HRC.

References:

[1] Hetzner D W. Refining carbide size distributions in M1 high speed steel by processing and alloying [J]. Materials Characterization, 2001, 46(2/3):175-182.
[2] Liu J T, Chang H B, Wu R H, et al. Investigation on hot deformation behavior of AISI T1 high-speed steel [J]. Materials Characterization, 2000, 45(3): 175-186.
[3] Pan Y C, Yang H, Liu X F, et al. Effect of K/Na on microstructure of high-speed steel used for rolls [J]. Materials Letters, 2004, 58(12/13): 1912-1916.
[4] Duan J T, Jiang Z Q, Fu H G. Effect of RE-Mg complex modifier on structure and performance of high speed steel roll [J]. Journal of Rare Earths, 2007, 25(S2): 259-263.
[5] Chaus A S. Application of bismuth for solidification structure refinement and properties enhancement in as-cast high-speed steels [J]. ISIJ International, 2005, 45(9):1297-1306.
[6] Lee E S, Park W J, Jung J Y, et al. Solidification microstructure and M₂C carbide decomposition in a spray-formed high-speed steel [J]. Metallurgical and Materials Transactions A, 1998, 29(5): 1395-1404.
[7] Di H S, Zhang X M, Wang G D, et al. Spheroidizing kinetics of eutectic carbide in the twin roll-casting of M2 high-speed steel [J]. Journal of Materials Processing Technology, 2005, 166(3):359-363.
[8] Hetzner D W, Geertruyden W V. Crystallography and metallography of carbides in high alloy steels [J]. Materials Characterization, 2008, 59(7): 825-841.
[9] Li Y J, Jiang Q C, Zhao Y G, et al. Influence of cerium on solidification microstructure of M2 high speed steel [J]. Journal of Rare Earths, 2000, 18(2): 132-135.
[10] Chen J Q. Distribution of rare earth in steel [J]. Journal of Jilin University, 1977(4): 27-31.(in Chinese)
[11] Zhou X F, Fang F, Li F, et al. Morphology and microstructure of M₂C carbide formed at different cooling rates in AISI M2 high speed steel [J]. Journal of Materials Science, 2011, 46(5): 1196-1202.
[12] Fredriksson H, Hillert M, Nica M. The decomposition of the M₂C carbide in high speed steel [J]. Scandinavian Journal of Metallurgy, 1979, 8(3): 115-122.
[13] Zhou X F, Fang F, Jiang J Q, et al. Refining carbide dimensions in AISI M2 high speed steel by increasing solidification rates and spheroidizing heat treatment [J]. Materials Science and Technology, 2014, 30(1): 116-122.

Memo

Memo:

Biography: Zhou Xuefeng(1982—), male, doctor, lecturer, xuefengzhou@seu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No.51301038, 51201031, 51371050), the Industry-Academia-Research Cooperative Innovation Fund of Jiangsu Province(No.BY2014127-03), the Natural Science Foundation of Jiangsu Province(No.BK20141306), the Scientific and Technological Innovation Fund of Danyang(No.SY201305).
Citation: Zhou Xuefeng, Fang Feng, Tu Yiyou, et al.Carbide refinement in M42 high speed steel by rare earth metals and spheroidizing treatment[J].Journal of Southeast University(English Edition), 2014, 30(4):445-448.[doi:10.3969/j.issn.1003-7985.2014.04.008]

Common functions