Study on primary carbonitrides in H13 steel based on the two-sublattice model

SUN Xiao-lin; Wang Fei; CHEN Xi-chun; GUO Han-jie; MAO Ming-tao

doi:10.13374/j.issn2095-9389.2017.01.008

Volume 39 Issue 1

Jan. 2017

Turn off MathJax

Article Contents

Article Navigation > Chinese Journal of Engineering > 2017 > 39(1): 61-67

SUN Xiao-lin, Wang Fei, CHEN Xi-chun, GUO Han-jie, MAO Ming-tao. Study on primary carbonitrides in H13 steel based on the two-sublattice model[J]. Chinese Journal of Engineering, 2017, 39(1): 61-67. doi: 10.13374/j.issn2095-9389.2017.01.008

Citation:

SUN Xiao-lin, Wang Fei, CHEN Xi-chun, GUO Han-jie, MAO Ming-tao. Study on primary carbonitrides in H13 steel based on the two-sublattice model[J]. Chinese Journal of Engineering, 2017, 39(1): 61-67. doi: 10.13374/j.issn2095-9389.2017.01.008

Citation:

PDF( 5402 KB)

Study on primary carbonitrides in H13 steel based on the two-sublattice model

doi: 10.13374/j.issn2095-9389.2017.01.008

1) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2) Research Institute for High Temperature Materials, Central Iron and Steel Research Institute, Beijing 100081, China

Received Date: 2015-12-28

Abstract

Abstract

Three kinds of primary carbonitrides were classified in H13 hot work die steel through experiment,including (V_x,Mo_1-x)(Cy,N_1-y) rich in V and C,(Ti_x,V_1-x)(C_y,N_1-y) rich in Ti and N,and (Ti_x,V_1-x)(C_y,N_1-y) rich in V and C,some having a core in the center.The element variation and Gibbs energy of the carbonitrides during H13 solidification were analyzed based on the solidification segregation model and the two-sublattice model,taking the interaction between components into account as well as the alloying element content and C/N ratio of the three types of primary carbonitrides.It is found that Tiand N-rich (Ti_x,V_1-x)(C_y,N_1-y) forms when the solid fraction reaches 0.9,while the other Vand C-rich (Ti_x,V_1-x)(C_y,N_1-y) generates when the solid fraction is greater than 0.96 during solidification.The critical solid fraction for the formation of these two (Ti_x,V_1-x)(C_y,N_1-y) decreases with increasing Ti and N contents soluted in the carbonitrides.The formation of (V_x,Mo_1-x)(C_y,N_1-y) during solidification can be affected by the x value.The critical solid fraction decreases as less vanadium is soluted in (V_x,Mo_1-x)(C_y,N_1-y),leading to larger size carbonitrides demonstrated by the models,which fit well with experimental data.The influence of oxides and carbonitrides on heterogeneous nucleation for the carbonitrides was also researched through lattice misfitting analysis.
- hot die steel,
- carbonitrides,
- segregation,
- sublattices,
- composition

FullText(HTML)

References(12)

References

[4]	Okaguchi S, Hashimoto T. Characteristics of precipitates and mechanical properties in Ti bearing HSLA steels. Trans ISIJ, 1987, 27(6):467
[6]	Zou H L, Kirkaldy J S. Carbonitride precipitate growth in titanium/niobium microalloyed steels. Metall Trans A, 1991, 22(7):1511
[7]	Inoue K, Ishikawa N, Ohnuma H, et al. Calculation of phase equilibria between austenite and (Nb,Ti,V) (C,N) in microalloyed steels. ISIJ Int, 2001, 41(2):175
[9]	Won Y M, Thomas B G. Simple model of microsegregation during solidification of steels. Metall Mater Trans A, 2001, 32(7):1755
[12]	Zhou J, Ma D S, Chi H X, et al. Microstructure and properties of hot working die steel H13 MOD. J Iron Steel Res Int, 2013, 20(9):117
[14]	Shi C B, Chen X C, Guo H J, et al. Control of MgO·Al₂O₃ spinel inclusions during protective gas electroslag remelting of die steel. Metall Mater Trans B, 2013, 44(2):378
[15]	Du S C. Standard Gibbs energies of formation of the carbides of vanadium by EMF measurement. Metall Trans B, 1990, 21(2):313
[16]	Turkdogan E T. Physical Chemistry of High Temperature Technology. New York:Academic Press Inc., 1980
[17]	Pak J J, Jeong Y S, Hong I K, et al. Thermodynamics of TiN formation in Fe-Cr melts. ISIJ Int, 2005, 45(8):1106
[18]	Pavlina E J, Speer J G, Tyne C J V. Equilibrium solubility products of molybdenum carbide and tungsten carbide in iron. Scripta Mater, 2012, 66(5):243
[19]	Bratberg J, Frisk K. A thermodynamic analysis of the Mo-V and Mo-V-C systems. Calphad, 2002, 26(3):459
[20]	Sigworth G K, Elliot J F. The thermodynamics of liquid dilute iron alloys. Met Sci, 1974, 8(1):298