Abstract:Effects of tempering temperature on morphology of metastable austenite and mechanical properties of Mn-Ni steel were investigated by X-ray Diffraction (XRD), Electron Back Scattering Diffraction (EBSD) and Transmission Electron Microscope(TEM). The results show that the volume fraction of metastable austenite at room temperature increased with the increase of tempering temperature. When tempering temperature was 600 and 625 ℃, metastable austenite mainly precipitated in the shape of thin film along the lath boundaries of tempered martensite, paralleling to the surrounding martensitic laths. This thin film metastable austenite had a dense distribution, with the thickness ranging from 60 to 100 nm, and had a good stability; when the tempering temperature was 650 ℃, thin film metastable austenite decreased dramatically and large block metastable austenite precipitated unevenly on the intersections of grain boundaries of tempered martensite. Analysis indicates that block metastable austenite is beneficial to the ductility of test steel, but it goes against to improving low temperature toughness; while thin film metastable austenite can improve low temperature toughness significantly.
收稿日期: 2014-02-18
出版日期: 2014-12-02
引用本文:
江 陆, 孙新军, 李昭东, 雍岐龙. 回火温度对Mn-Ni钢亚稳奥氏体形貌及其力学性能的影响[J]. 钢铁, 2014, 49(12): 59-64.
JIANG Lu, SUN Xin-jun, LI Zhao-dong, YONG Qi-long. Effects of Tempering Temperature on Morphology of Metastable Austenite and Mechanical Properties of Mn-Ni Steel. Iron and Steel, 2014, 49(12): 59-64.
Thomas G.Retained austenite and tempered martensite embrittlement[J].Metallurgical Transactions A, 1978, 9(3):439-450
[1]
Thomas G.Retained austenite and tempered martensite embrittlement[J].Metallurgical Transactions A, 1978, 9(3):439-450
[2]
Zhang K, Zhang M, Guo Z, et al.A new effect of retained austenite on ductility enhancement in high-strength quenching–partitioning–tempering martensitic steel[J].Materials Science and Engineering: A, 2011, 528(29):8486-8491
[2]
Zhang K, Zhang M, Guo Z, et al.A new effect of retained austenite on ductility enhancement in high-strength quenching–partitioning–tempering martensitic steel[J].Materials Science and Engineering: A, 2011, 528(29):8486-8491
[3]
Fultz B, Kim J I, Kim Y H, et al.The stability of precipitated austenite and the toughness of 9Ni steel[J].Metallurgical Transactions A, 1985, 16(12):2237-2249
[3]
Fultz B, Kim J I, Kim Y H, et al.The stability of precipitated austenite and the toughness of 9Ni steel[J].Metallurgical Transactions A, 1985, 16(12):2237-2249
[4]
Wang Y, Zhang K, Guo Z, et al.A new effect of retained austenite on ductility enhancement in high strength bainitic steel[J]. [J].Materials Science and Engineering: A, 2012, 552:288-294
[4]
Wang Y, Zhang K, Guo Z, et al.A new effect of retained austenite on ductility enhancement in high strength bainitic steel[J]. [J].Materials Science and Engineering: A, 2012, 552:288-294
ZHANG F T, WANG J Y, GUO Y Y.On the relationship between return austenite and toughness for Ni9 steel at cryogenic temperatures[J].Acta Metall Sin, 1984, 20(6):405-410
[6]
ZHANG F T, WANG J Y, GUO Y Y.On the relationship between return austenite and toughness for Ni9 steel at cryogenic temperatures[J].Acta Metall Sin, 1984, 20(6):405-410
[7]
MORRIS J W, GUO Z, KRENN C R, et al.The limits of strength and toughness in steel[J].ISIJ international, 2001, 41(6):599-611
[7]
MORRIS J W, GUO Z, KRENN C R, et al.The limits of strength and toughness in steel[J].ISIJ international, 2001, 41(6):599-611
[8]
YANG Y, CAI Q, TANG D, et al.Precipitation and stability of reversed austenite in 9Ni steel[J].International Journal of Minerals, Metallurgy, and Materials, 2010, 17(5):587-595
[8]
YANG Y, CAI Q, TANG D, et al.Precipitation and stability of reversed austenite in 9Ni steel[J].International Journal of Minerals, Metallurgy, and Materials, 2010, 17(5):587-595
[9]
Sun S, Pugh M.Manganese partitioning in dual-phase steel during annealing[J].Materials Science and Engineering: A, 2000, 276(1):167-174
[9]
Sun S, Pugh M.Manganese partitioning in dual-phase steel during annealing[J].Materials Science and Engineering: A, 2000, 276(1):167-174
[10]
De Moor E, Matlock D K, Speer J G, et al.Austenite stabilization through manganese enrichment[J].Scripta Materialia, 2011, 64(2):185-188
[10]
De Moor E, Matlock D K, Speer J G, et al.Austenite stabilization through manganese enrichment[J].Scripta Materialia, 2011, 64(2):185-188
[11]
KIM J I, KIM H J, MORRIS J W.The role of the constituent phases in determining the low temperature toughness of 55 Ni cryogenic steel[J].Metallurgical Transactions A, 1984, 15(12):2213-2219
[11]
KIM J I, KIM H J, MORRIS J W.The role of the constituent phases in determining the low temperature toughness of 55 Ni cryogenic steel[J].Metallurgical Transactions A, 1984, 15(12):2213-2219
[12]
LI L, GAO Y, ZHU N Q, et al.Technology for high performance TRIP steel[J].Science China Technological Sciences, 2012, 55(7):1823-1826
[12]
LI L, GAO Y, ZHU N Q, et al.Technology for high performance TRIP steel[J].Science China Technological Sciences, 2012, 55(7):1823-1826
[13]
FULTZ B, MORRIS J W.A m?ssbauer spectrometry study of the mechanical transformation of precipitated austenite in 6Ni steel[J][J].Metallurgical and Materials Transactions A, 1985, 16:173-177
[13]
FULTZ B, MORRIS J W.A m?ssbauer spectrometry study of the mechanical transformation of precipitated austenite in 6Ni steel[J][J].Metallurgical and Materials Transactions A, 1985, 16:173-177
[14]
MORRIS J W, JR, KIM J I, FULTZ B.Consequences of the Re-Transformation of Precipitated Austenite in Ferritic Cryogenic Steels[R].Cambridge: Lawrence Berkeley National Laboratory, 1979.
[14]
MORRIS J W, JR, KIM J I, FULTZ B.Consequences of the Re-Transformation of Precipitated Austenite in Ferritic Cryogenic Steels[R].Cambridge: Lawrence Berkeley National Laboratory, 1979.