G18CrMo2-6钢在高温回火过程中第二相的演变

doi:10.11901/1005.3093.2015.640

材料研究学报

2016, Vol. 30

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

本期目录 | 过刊浏览

G18CrMo2-6钢在高温回火过程中第二相的演变

李振江, 郑雷刚

中国科学院金属研究所沈阳材料科学国家(联合)实验室沈阳 110016

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

引用本文:

李振江, 郑雷刚. G18CrMo2-6钢在高温回火过程中第二相的演变[J]. 材料研究学报, 2016, 30(8): 561-567.
Zhenjiang LI, Leigang ZHENG. Evolution of Secondary Phase in G18CrMo2-6 Steel during High Temperature Tempering[J]. Chinese Journal of Materials Research, 2016, 30(8): 561-567.

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摘要:

应用扫描电子显微镜、透射电子显微镜和能谱技术等手段研究了G18CrMo2-6钢正火组织中第二相在680℃下保温一系列时间段的转变。结果表明, 在正火后贝氏体中析出相主要为马氏体/奥氏体(M/A)组元和合金渗碳体(M₃C); 在回火保温初期M/A分解为铁素体(α)与M₃C组织, 随着保温时间延长M₃C逐渐球化并溶解, M₂₃C₆在晶界析出并长大, 同时基体上有细小弥散的MC相析出。即回火保温过程中组织随时间的延长发生M/A→α+M₃C, M₃C→M₂₃C6+MC的变化。

关键词 ：金属材料, G18CrMo2-6钢, 第二相, 回火, 演变

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

收稿日期: 2015-11-11

作者简介: 本文联系人: 李振江

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https://www.cjmr.org/CN/10.11901/1005.3093.2015.640 或 https://www.cjmr.org/CN/Y2016/V30/I8/561

表1 标准中G18CrMo2-6钢及实验用G18CrMo2-6钢的化学成分

图1 G18CrMo2-6钢940℃×2 h正火后的微观组织

图2 G18CrMo2-6 钢正火后的微观组织

图3 在680℃保温不同时间的金相组织

图4 M/A组元随着保温时间的变化

图5 G18CrMo2-6 钢经过不同回火时间后贝氏体区的微观组织

图6 G18CrMo2-6钢经过不同回火时间后晶界的微观组织

图7 G18CrMo2-6钢的大块状第二相TEM像及衍射斑点分析

图8 G18CrMo2-6 钢回火组织的TEM像及碳化物衍射斑点分析

图9 G18CrMo2-6 钢回火后晶界析出相的 TEM像及衍射斑点分析

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