고경도 철계 장갑재의 미세조직과 기계적 특성 분석

이지민; 한종주; 송영범; 함진희; 김홍규; 황병철; Ji-Min Lee; Jong-Ju Han; Young-Beum Song; Jin-Hee Ham; Hong-Kyu Kim; Byoungchul Hwang

Korean Journal of Materials Research, Vol.28, No.8, 459-465, August, 2018

DOI10.3740/MRSK.2018.28.8.459 Export Citation

고경도 철계 장갑재의 미세조직과 기계적 특성 분석

Microstructure and Mechanical Properties of the High-Hardness Armor Steels

이지민, 한종주, 송영범¹, 함진희¹, 김홍규¹, 황병철 ^†

서울과학기술대학교 신소재공학과
¹국방과학연구소 제4기술연구본부

Ji-Min Lee, Jong-Ju Han, Young-Beum Song¹, Jin-Hee Ham¹, Hong-Kyu Kim¹, and Byoungchul Hwang^†

Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
¹The 4th R&D Institute, Agency for Defense Development, Daejeon 34060, Republic of Korea

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This paper presents a study of the microstructure and mechanical properties of commercial high-hardness armor (HHA) steels tempered at different temperatures. Although the as-received specimens of all the steels exhibit a tempered martensite structure with lath type morphology, the A steel, which has the smallest carbon content, had the lowest hardness due to reduced solid solution hardening and larger lath thickness, irrespective of tempering conditions. As the tempering temperature increases, the hardness of the steels steadily decreases because dislocation density decreases and the lath thickness of martensite increases due to recovery and over-aging effects. When the variations in hardness plotted as a function of tempering temperature are compared with the hardness of the as-received specimens, it seems that the B steel, which has the highest yield and tensile strengths, is fabricated by quenching, while the other steels are fabricated by quenching and tempering. On the other hand, the impact properties of the steels are affected by specimen orientation and test temperature as well as microstructure. Based on these results, the effect of tempering on the microstructure and mechanical properties of commercial high-hardness armor steels is discussed.

Keywords:high-hardness armor;steels;microstructure;mechanical properties;impact toughness

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Hertzberg RW: Deformation and Fracture Mechanics of Engineering Materials, John Wiley & Sons, Inc., 1996.
Lim HS, Lee J, Song YB, Kim HK, Hwang B, Korean. J. Mater. Res., 27, 357 (2017)
Cottrell AH, Bilby BA, Proc. Phys. Soc., 62, 49 (1949)
Granas L, Scand. J. Metall., 1, 255 (1972)
Fakir R, Barka N, Brousseau J, Met. Mater. Int., 24, 1 (2018)
Dehghani K, Nekahi A, Met. Mater. Int., 18, 757 (2012)
Palanikumar K, Karunamoorthy L, Karthikeyan R, Latha B, Met. Mater. Int., 12, 483 (2006)

[Related Articles]

[1] Sohn SW, Hong SH, J. Korean Soc. Precis. Eng., 7, 7 (2002)

[2] Demir T, Ubeyli M, Ylldlrlm RO, J. Mater. Eng. Perform., 18, 145 (2009)

[3] Dikshit SN, Kutumbarao VV, Sundararajan G, Int. J. Impact Eng., 16, 293 (1995)

[4] Kim HK, Hong SS, Shim IO, Compos. Res., 24, 46 (2011)

[5] ORDP 20-170 Ordnance Engineering Design Handbook, Armor and its application to vehicles, Ordnance Corps, (1961).

[6] Isfahany AN, Saghafian H, Borhani G, J. Alloy. Compd., 509, 3931 (2011)

[7] Zhong N, Wang XD, Wang L, Rong YH, Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process., 506, 111 (2009)

[8] SSAB. Retrieved May 10, 2018 from https://www.ssab.kr.

[9] ArcelorMittal. Retrieved May 10, 2018 from http://industeel.arcelormittal.com.

[10] Porter DA, Easterling KE, Sherif M : Phase Transformations in Metals and Alloys (Revised Reprint), CRC press, 2009.

[11] Krauss G: Principles of Heat Treatment of Steel, American Society for Metals, 1988.

[12] Dieter GE: Mechanical Metallurgy, McGraw-Hill, 2001.

[13] Hertzberg RW: Deformation and Fracture Mechanics of Engineering Materials, John Wiley & Sons, Inc., 1996.

[14] Lim HS, Lee J, Song YB, Kim HK, Hwang B, Korean. J. Mater. Res., 27, 357 (2017)

[15] Cottrell AH, Bilby BA, Proc. Phys. Soc., 62, 49 (1949)

[16] Granas L, Scand. J. Metall., 1, 255 (1972)

[17] Fakir R, Barka N, Brousseau J, Met. Mater. Int., 24, 1 (2018)

[18] Dehghani K, Nekahi A, Met. Mater. Int., 18, 757 (2012)

[19] Palanikumar K, Karunamoorthy L, Karthikeyan R, Latha B, Met. Mater. Int., 12, 483 (2006)