Effect of Molybdenum on Microstructure and Properties of AISI D2 Tool Steel

doi:10.11901/1005.3093.2017.426

Chinese Journal of Materials Research

2018, Vol. 32

Issue (6): 432-431 DOI: 10.11901/1005.3093.2017.426

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Effect of Molybdenum on Microstructure and Properties of AISI D2 Tool Steel

Xumin LI¹, Feng FANG¹, Yiyou TU¹, Xuefeng ZHOU¹(

), Jianzhong WU², Huixia XU²

1 Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
2 Jiangsu Engineering Research Center of Tool Steel, Danyang 215400, China

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Xumin LI, Feng FANG, Yiyou TU, Xuefeng ZHOU, Jianzhong WU, Huixia XU. Effect of Molybdenum on Microstructure and Properties of AISI D2 Tool Steel. Chinese Journal of Materials Research, 2018, 32(6): 432-431.

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Abstract

Effect of Mo-content on the microstructure and properties of AISI D2 tool steel has been studied by means of OM, SEM, TEM, XRD and EDS. Results show that with the increasing Mo-content, the grain size of the steel decreased, while the amount of eutectic carbides increased, and the morphology of which changed from rod-like to fish bone-like and block-like. The thermal stability of the fish bone-like and block-like carbides is higher than that of the rod-like ones, thereby, they are difficult to dissolve and spheroidize during heating process. This fact may result in the decrease in solubility of alloying elements after quenching, and the decrease in hardness after tempering. The optimum Mo content is between 0.9% and 1.1%, correspondingly, the hardness of the tempered D2 steel is 61 HRC, and the impact toughness reaches about 20 J/cm².

Key words: metallic materials D2 tool steel molybdenum carbide hardness impact toughness

Received: 14 July 2017

ZTFLH:

TG142.1

Fund: Supported by National Natural Science Foundation of China (No. 51301038), Primary Research and Development Plan of Jiangsu Province (No. BE2016154), Special Funds of Scientific and Technological Development of Danyang City (No. SGP201502)

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	Xumin LI
	Feng FANG
	Yiyou TU
	Xuefeng ZHOU
	Jianzhong WU
	Huixia XU

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.426 OR https://www.cjmr.org/EN/Y2018/V32/I6/432

Fig.1 Microstrucure of D2 ingot: (a) 0.7%Mo; (b) 0.9%Mo; (c) 1.1%Mo; (d) 1.3%Mo

Fig.2 Three-dimensional morphologies of eutectic carbide in D2 ingot: (a) 0.7%Mo; (b) 0.9%Mo; (c) 1.1%Mo; (d) 1.3%Mo

Table1 Chemical composition of carbides with different morphologies (%, mass fraction)

Fig.3 XRD profiles of carbides in D2 ingots (a) 0.7% Mo; (b) 1.3%Mo

Fig.4 Bright field image and diffraction pattern of the M₇C₃carbides: (a) 0.7%Mo; (b) 1.3%Mo

Fig.5 Three-dimensional morphologies of eutectic carbides after heating: (a) 0.7%Mo; (b) 0.9%Mo; (c) 1.1%Mo; (d) 1.3%Mo

Fig.6 Microstructure of D2 steel after forging (K=6) (a) 0.7%Mo; (b) 0.9%Mo; (c) 1.1%Mo; (d) 1.3%Mo

Fig.7 Microstructure of D2 steel after quenching at 1100℃ (a) 0.7%Mo, (b) 0.9%Mo, (c) 1.1%Mo, (d) 1.3%Mo

Fig.8 Alloy content of the martrix after quenching at different temperature

Fig.9 Hardness and toughness of the D2 steel with different contents of Mo after quenching and tempering

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