Tailoring Variant Pairing to Enhance Impact Toughness in High-Strength Low-Alloy Steels via Trace Carbon Addition

doi:10.1007/s40195-020-01186-x

Abstract

Abstract:

Alloying can make conventional metals reach ultra-high strength, but this usually comes at dramatic loss of toughness. In this work, a desirable strength-toughness combination in high-strength low-alloy steel achieved via trace carbon addition. The significance of carbon in tailoring variant pairing and tuning impact toughness was elucidated from the perspective of crystallography and thermodynamics. As the carbon content increases, the packets and blocks are refined, and the - 40 ℃ impact toughness improves. The enhancement of impact toughness results from the higher density of block boundaries, and the fracture mode shifts from brittle fracture to ductile-brittle combined fractures, then to ductile fracture due to the increased carbon. Increasing the carbon content would lower the martensite start temperature (M_S) temperature and driving force for martensitic transformation, and increase the strength of austenite matrix, which in turn contributes to producing more V1/V2 variant pairs to accommodate the transformation strain.

Key words: High-strength low-alloy steel, Carbon, Impact toughness, Variant pairing, Phase transformation

Yi-Shuang Yu, Zhi-Quan Wang, Bin-Bin Wu, Jing-Xiao Zhao, Xue-Lin Wang, Hui Guo, Cheng-Jia Shang. Tailoring Variant Pairing to Enhance Impact Toughness in High-Strength Low-Alloy Steels via Trace Carbon Addition[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(6): 755-764.

Figures/Tables 12

References 34

[1]	Y.Q. Weng, C.F. Yang, C.J. Shang, Kang T’ieh/Iron and Steel 46, 1 (2011)
[2]	G. Krauss, Steels: Processing, Structure, and Performance, 2nd edn. ( Materials Park, Ohio, ASM International, 2015), p. 246
[3]	X. Li, K. Lu, Nat. Mate. 16, 700 (2017)
[4]	X. Li, K. Lu, Science 364, 733 (2019)
[5]	M. Kapoor, D. Isheim, G. Ghosh, S. Vaynman, M.E. Fine, Y.W. Chung, Acta Mate. 73, 56 (2014) DOI URL
[6]	M. Kapoor, R. O’Malley, G.B. Thompson, Metall. Mater. Trans. A 47, 1984 (2016)
[7]	J. Hannula, J. Kömi, D.A. Porter, M.C. Somani, A. Kaijalainen, P. Suikkanen, J.R. Yang, S.P. Tsai, Metall. Mater. Trans. A 48, 5344 (2017)
[8]	J. Takahashi, K. Ishikawa, K. Kawakami, M. Fujioka, N. Kubota, Acta Mate. 133, 41 (2017) DOI URL
[9]	G. Huang, X.L. Wan, K.M. Wu, H.Z. Zhao, R.D.K. Misra, Metals 8, 718 (2018)
[10]	F.C. Cerda, C. Goulas, I. Sabirov, S. Papaefthymiou, A. Monsalve, R.H. Petrov, Mater. Sci. Eng. A 672, 108 (2016)
[11]	Z.J. Xie, G. Han, W.H. Zhou, X.L. Wang, C.J. Shang, R.D.K. Misra, Scr. Mate. 155, 164 (2018)
[12]	G. Gao, B. Gao, X. Gui, J. Hu, J. He, Z. Tan, B. Bai, Mater. Sci. Eng. A 753, 1 (2019)
[13]	J.R. Davis, Metals Handbook Desk Edition, 2nd edn. ( Materials Park, Ohio, ASM International, 1998), p. 464
[14]	Y.D. Chung, H. Fujii, R. Ueji, N. Tsuji, Scr. Mate. 63, 223 (2010)
[15]	A. Stormvinter, G. Miyamoto, T. Furuhara, P. Hedström, A. Borgenstam, Acta Mate. 60, 7265 (2012) DOI URL
[16]	T. Kaneshita, G. Miyamoto, T. Furuhara, Acta Mate. 127, 368 (2017) DOI URL
[17]	X.L. Wang, X.P. Ma, Z.Q. Wang, S.V. Subramanian, Z.J. Xie, C.J. Shang, X.C. Li, Mater. Charact. 149, 26 (2019) DOI
[18]	S. Huang, B.B. Wu, Z.Q. Wang, Y.S. Yu, C.S. Wang, L. Yan, X.C. Li, C.J. Shang, R.D.K. Misra, Mater. Lett. 254, 412 (2019) DOI
[19]	B.B. Wu, Z.Q. Wang, Y.S. Yu, X.L. Wang, C.J. Shang, R.D.K. Misra, Scr. Mate. 170, 43 (2019)
[20]	C. Cayron, J. Appl. Cryst. 40, 1183 (2007) DOI URL
[21]	X.L. Wang, Z.Q. Wang, L.L. Dong, C.J. Shang, X.P. Ma, S.V. Subramanian, Mater. Sci. Eng. A 704, 448 (2017)
[22]	S.M.C. van Bohemen, L. Morsdorf, Acta Mater. 125, 401 (2017) DOI URL
[23]	C. Celada- ero, J. Sietsma, M.J. Santofimia, Mater. Des. 167, 107625 (2019) DOI URL
[24]	S. Morito, H. Saito, T. Ogawa, T. Furuhara, T. Maki, ISIJ Int. 45, 91 (2005) DOI URL
[25]	N. Takayama, G. Miyamoto, T. Furuhara, Acta Mate. 60, 2387 (2012) DOI URL
[26]	S. Morito, H. Tanaka, R. Konishi, T. Furuhara, T. Maki, Acta Mate. 51, 1789 (2003) DOI URL
[27]	S.M.C. van Bohemen, Materialia 7, 100384 (2019)
[28]	T. Furuhara, H. Kawata, S. Morito, T. Maki, Mater. Sci. Eng. A 431, 228 (2006)
[29]	H. Kawata, K. Sakamoto, T. Moritani, S. Morito, T. Furuhara, T. Maki, Mater. Sci. Eng. A 438-440, 140(2006)
[30]	A.F. Gourgues, Mater. Sci. Technol. 18, 119 (2002) DOI URL
[31]	J.L. González-Velázquez, Fractography and Failure Analysis (Springer International Publishing, Switzerland, 2018), p. 49
[32]	N.J. Petch, J. Iron Steel Inst. 174, 25 (1953)
[33]	D. Barbier, Adv. Eng. Mate. 16, 122 (2014)
[34]	S.A. Filippov, N.Y. Zolotorevsky, Mater. Lett. 214, 130 (2018) DOI URL

Steel	C	Si	Mn	P	S	Cr + Ni + Cu + Mo	B
0.04C	0.04	0.21	1.35	0.011	0.012	2.72	0.0020
0.08C	0.08	0.23	1.34	0.009	0.010	2.65	0.0011
0.12C	0.12	0.22	1.28	0.008	0.010	2.69	0.0016

Steel	C	Si	Mn	P	S	Cr + Ni + Cu + Mo	B
0.04C	0.04	0.21	1.35	0.011	0.012	2.72	0.0020
0.08C	0.08	0.23	1.34	0.009	0.010	2.65	0.0011
0.12C	0.12	0.22	1.28	0.008	0.010	2.69	0.0016

Steel	Yield strength (MPa)	Tensile strength (MPa)	Total elongation (%)	Impact energy (J)
0.04C	853	1059	14.2	35 (± 7)
0.08C	1022	1268	12.7	57 (± 1)
0.12C	1052	1327	14.6	63 (± 2)

Steel	Yield strength (MPa)	Tensile strength (MPa)	Total elongation (%)	Impact energy (J)
0.04C	853	1059	14.2	35 (± 7)
0.08C	1022	1268	12.7	57 (± 1)
0.12C	1052	1327	14.6	63 (± 2)

OR	Steel	Euler angle
OR	Steel	φ1 (°)	Φ (°)	φ2 (°)
Exact K-S OR		114.2	10.5	204.2
Actual OR	0.04C	117.3	8.9	199.1
	0.08C	118.1	8.8	198.0
	0.12C	120.2	8.9	195.8