PRECIPITATION BEHAVIOR OF CARBIDE DURING HEATING PROCESS IN Nb AND Nb-Mo MICRO-ALLOYED STEELS

doi:10.11900/0412.1961.2014.00424

Acta Metall Sin

2015, Vol. 51

Issue (3): 315-324 DOI: 10.11900/0412.1961.2014.00424

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PRECIPITATION BEHAVIOR OF CARBIDE DURING HEATING PROCESS IN Nb AND Nb-Mo MICRO-ALLOYED STEELS

ZHANG Zhengyan^1,², LI Zhaodong¹, YONG Qilong¹(

), SUN Xinjun¹, WANG Zhenqiang³, WANG Guodong²

1 Department of Structural Steels, Central Iron and Steel Research Institure, Beijing 100081
2 State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819
3 Shougang Research Institute of Technology, Beijing 100043

Cite this article:

ZHANG Zhengyan, LI Zhaodong, YONG Qilong, SUN Xinjun, WANG Zhenqiang, WANG Guodong. PRECIPITATION BEHAVIOR OF CARBIDE DURING HEATING PROCESS IN Nb AND Nb-Mo MICRO-ALLOYED STEELS. Acta Metall Sin, 2015, 51(3): 315-324.

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Abstract

As an important carbide forming element, Nb plays an important role in steel. Precipitated Nb can restrain the austenite grain growth during soaking process and provide precipitation strengthening after g/a phase transformation. Precipitated or dissolved Nb can inhibit recrystallizaton of deformed austenite. Recently, both Nb and Mo are added in steel to enhance the role of Nb. However, these kinds of researches mostly focused on continual cooling process of g/a transformation or isothermal process during tempering, and precipitation behavior of MC-type carbide in steel containing Nb and Mo during reheating process and the effect of Mo on precipitation of NbC in ferrite were rarely reported. Therefore, in this work, precipitation behaviors of MC-type carbide and the synergistic effect of Nb and Mo in steel containing Nb or Nb-Mo during reheating process at the heat rate 20 ℃/min were investigated by means of Vickers hardness test, SEM, HRTEM and DSC. The results show that both Nb and Nb-Mo steels have hardness peaks at 300 and 700 ℃, which are attributed to the precipitation of e-carbide and MC-type carbide, respectively. The MC-type carbide precipitates at about 650 ℃ during reheating process, which is in a good agreement with the nose temperature of MC-type carbide calculated by Avrami equation. (Nb, Mo)C particle forming in Nb-Mo steel during precipitation has a small mismatch with ferrite matrix compared with NbC, leading to the decrease of interfacial energy. Thus, the precipitation kinetic of MC-type carbide in Nb-Mo steel is faster than that in Nb steel, which results in the denser and finer MC-type carbide and higher precipitation strengthening effect.

Key words: carbide precipitation Vickers hardness interfacial energy

ZTFLH:

TG142

Fund: Supported by National Basic Research Program of China (No.2010CB630805) and National Natural Science Foundation of China (No.51201036)

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	Zhengyan ZHANG
	Zhaodong LI
	Qilong YONG
	Xinjun SUN
	Zhenqiang WANG
	Guodong WANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00424 OR https://www.ams.org.cn/EN/Y2015/V51/I3/315

Table 1 Chemical compositions of Nb and Nb-Mo microalloyed steels

Fig.1 Vickers hardness of Nb and Nb-Mo microalloyed steels after quenching at 1200 ℃ for 5 h followed by heating to 200~750 ℃

Fig.2 SEM images of Nb (a) and Nb-Mo (b) microalloyed steels quenched at 1200 ℃ for 5 h (M/A—martensite/austenite)

Fig.4 TEM bright (a), dark (b) field images and SAED pattern (c) of M/A island in quenched Nb-Mo microalloyed steel and TEM image (d), SAED pattern (e) and EDS spectrum (f) of e-carbide in Nb-Mo microalloyed steel when heated to 300 ℃ followed by water quenching

Fig.5 TEM images of Nb (a~c) and Nb-Mo (d~f) steels heated to 500 ℃ (a, d), 600 ℃ (b, e) and 700 ℃ (c, f)

Fig.6 Morphologies (a, b), HRTEM images (c, d) and EDS spectra (e, f) of precipitates in Nb (a, c, e) and Nb-Mo (b, d, f) microalloyed steels (a—lattice constant)

Fig.7 DSC curves of Nb and Nb-Mo microalloyed steels during heating from 150 to 400 ℃

Fig.8 Lattice parameter of (Nb_xMo₁_-_x)C varied with atomic fraction of Mo in (Nb_xMo₁_-_x)C

Fig.9 Variation of interfacial energy between (Nb_xMo₁_-_x)C and ferrite with temperatures

Fig.10 Variation of critical nucleation energy ΔG_c (a) and critical nucleation size d_c (b) of (Nb_xMo_1-x)C depending with temperatures during heating process

Fig.11 Precipitation-temperature-time (PTT) curves of (Nb_xMo₁_-_x)C during heating process (t_0.05—the time when the mass fraction of the precipitation of (Nb_xMo₁_-_x)C reaches 5%, t₀—constant irrelevant to time)

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