6Cr13Mo不锈钢中碳化物演变规律研究

宋令玺; 郑淮北; 杨亚光; 王英虎

doi:10.7513/j.issn.1004-7638.2022.03.025

6Cr13Mo不锈钢中碳化物演变规律研究

doi: 10.7513/j.issn.1004-7638.2022.03.025

宋令玺^{1, 2},
郑淮北^{1, 2},
杨亚光³,
王英虎^{1, 2}

1.
成都先进金属材料产业技术研究院股份有限公司, 四川成都 610300
2.
海洋装备用金属材料及其应用国家重点实验室, 辽宁鞍山 114009
3.
攀钢集团江油长城特殊钢有限公司, 四川绵阳 621700

详细信息

中图分类号: TF76,TG142.71
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- 被引次数: 0
出版历程
- 收稿日期: 2021-07-09
- 刊出日期: 2022-06-30

Study of carbide evolution in a 6Cr13Mo stainless steel

Song Lingxi^{1, 2},
Zheng Huaibei^{1, 2},
Yang Yaguang³,
Wang Yinghu^{1, 2}

1.
Chengdu Advanced Metal Materials Industrial Technolgy Research Institute Co., Ltd., Chengdu 610300, Sichuan， China
2.
State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114009, Liaoning， China
3.
Pangang Group Jiangyou Changcheng Special Steel Co., Ltd. , Mianyang 621700, Sichuan， China

摘要

摘要: 采用Thermo-Calc热力学软件对6Cr13Mo不锈钢进行了相图计算，利用超高温共聚焦显微镜模拟了6Cr13Mo不锈钢加热、冷却及凝固过程，观察分析了碳化物的演变规律。结果表明：相图计算的6Cr13Mo不锈钢平衡室温组织为铁素体和M₂₃C₆类型碳化物；凝固过程中成分发生凝固偏析，当液相中C含量达到约为1%时，成分体系变为亚共晶钢体系，在析出奥氏体的同时，液相中直接析出M₇C₃类型的碳化物；加热过程中，随着温度升高，碳化物呈先增加后减少趋势；降温过程中，随着温度降低，碳化物逐渐增多，且在800 ℃时达到峰值；凝固过程中，随着凝固速率的提高，M₇C₃数量减少且形态改变。
- 6Cr13Mo不锈钢 /
- 凝固；偏析 /
- M₂₃C₆碳化物 /
- M₇C₃碳化物 /
- 凝固速率
Abstract: Thermo-Calc thermodynamic software was used to calculate the phase diagram of 6Cr13Mo stainless steel. The heating, cooling, and solidification processes of 6Cr13Mo stainless steel were simulated via an ultra-high temperature confocal microscope, and the evolution of carbide was observed and analyzed. The results show that the room temperature microstructure of 6Cr13Mo stainless steel calculated by phase diagram is ferrite and M₂₃C₆ type carbides. During the solidification process, the components undergo solidification segregation. The composition system changes into the hypoeutectic steel system when the content of C in the liquid phase reaches about 1%, and M₇C₃ type carbides precipitate directly from the liquid phase while austenite precipitates. During the heating process, the carbide first increases and then decreases with the increase in temperature. During the cooling process, the carbide gradually increases with the decrease of temperature and reaches a peak at 800 ℃. During the solidification process, the number of M₇C₃ decreases, and the morphology changes with the increase in the solidification rate.
- 6Cr13Mo stainless steel /
- solidification , segregation /
- M₂₃C₆ carbide /
- M₇C₃ carbide /
- solidification rate

HTML全文

图 1 6Cr13Mo不锈钢组织转变

（a）平衡相图；（b）各析出相质量分数随温度变化；（c）计算的各相中C的质量分数；（d）6Cr13Mo退火态组织

Figure 1. Microstructure evolution of 6Cr13Mo stainless steel

下载: 全尺寸图片幻灯片

图 2 6Cr13Mo不锈钢升温过程照片

Figure 2. Microstructures evolution of 6Cr13Mo stainless steel in heating process

(a) 900 ℃; (b) 1 020 ℃; (c) 1 180℃; (d) 1 300 ℃

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图 3 6Cr13Mo不锈钢降温过程照片

Figure 3. Microstructures evolution of 6Cr13Mo stainless steel in cooling process

(a) 1 300 ℃; (b) 1 000 ℃; (c) 900 ℃; (d) 800 ℃

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图 4 不同温度冷却速率下6Cr13Mo不锈钢凝固组织照片

Figure 4. Solidification microstructures of 6Cr13Mo stainless steel at different cooling rates

（a）30 ℃/min；（b）50 ℃/min；（c）100 ℃/min；（d）30 ℃/min；（e）50 ℃/min；（f）100 ℃/min

下载: 全尺寸图片幻灯片

图 5 6Cr13Mo不锈钢能谱分析

（a）SEM图像；（b）位置1EDS图谱；（c）位置2EDS图谱；（d）位置3EDS图谱

Figure 5. EDS analysis of 6Cr13Mo stainless steel

下载: 全尺寸图片幻灯片

图 6 6Cr16Mo不锈钢EBSD分析

（a）相比例；（b） IPF

Figure 6. EBSD analysis of 6Cr13Mo stainless steel

下载: 全尺寸图片幻灯片

表 1 6Cr13Mo不锈钢主要合金成分

Table 1. Chemical composition of 6Cr13Mo stainless steel %

C Mn Si Cr Mo Ni

0.58～0.65 0.20～0.48 0.25～0.50 13～14 0.25～−0.32 ≤0.60

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