Evolution of Secondary Phase in G18CrMo2-6 Steel during High Temperature Tempering

doi:10.11901/1005.3093.2015.640

Chinese Journal of Materials Research

2016, Vol. 30

Issue (8): 561-567 DOI: 10.11901/1005.3093.2015.640

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Evolution of Secondary Phase in G18CrMo2-6 Steel during High Temperature Tempering

LI Zhenjiang^*, ZHENG Leigang

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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LI Zhenjiang, ZHENG Leigang. Evolution of Secondary Phase in G18CrMo2-6 Steel during High Temperature Tempering. Chinese Journal of Materials Research, 2016, 30(8): 561-567.

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Abstract

The evolution of the secondary phase in G18CrMo2-6 heat-resistant steel induced by tempering at 680℃ for a series of durations was investigated by optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and energy dispersive X-ray detector (EDX). It demonstrates that martensite/austenite (M/A) particles and M₃C precipitate on bainite matrix after normalizing. During the tempering, decomposition of M/A particles into the M₃C carbides in bainite matrix can be found. The increasing of tempering time results in the precipitation of MC, the spheroidization and refinement of M₃C carbide as well as the precipitation and coarsening of M₂₃C6 carbide at the grain boundaries.

Key words: metallic materials G18CrMo2-6 steel second phase tempering evolution

Received: 11 November 2015

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.640 OR https://www.cjmr.org/EN/Y2016/V30/I8/561

Table 1 Chemical compositions of the steel G18CrMo2-6 in standard and this work (%, mass fraction)

Fig.1 OM (a) and SEM (b, c) images of 940℃×2 h normalized G18CrMo2-6 steel

Fig.2 SEM (a) and LSCM (b) images of air-cooling normalized G18CrMo2-6 steel

Fig.3 The OM images of G18CrMo2-6 steel tempered at 680℃ for 0 h (a), 100 h (b), 500 h (c) and 1000 h (d)

Fig.4 SEM images of M/A island after normalized (a) and tempered at 680℃ for 1 h (b), 2 h (c)

Fig.5 SEM images of bainite region after tempered at 680℃ for 0 h (a), 20 h(b), 100 h (c), 200 h (d), 500 h (e) and 1000 h (f)

Fig.6 SEM images of grain boundary after normalized and tempered at 680℃ for 0 h (a), 20 h (b), 100 h (c), 200 h (d), 500 h (e) and 1000 h (f)

Fig.7 TEM micrographs (a) and SAED pattern analysis of carbides (b) for G18CrMo2-6 steel normalized

Fig.8 TEM micrographs of rod-like particle with small size within bainite (tempering with 2 h (a), 100 h (b)), SAED pattern analysis (c) and EDS result

Fig.9 TEM micrographs of M₂₃C₆carbide at grain boundary (a) and SAED pattern analysis (b)

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