基于热力学模拟计算的<strong>CLF-1</strong>钢改良设计

doi:10.11901/1005.3093.2022.279

材料研究学报

2023, Vol. 37

Issue (8): 590-602 DOI: 10.11901/1005.3093.2022.279

研究论文

本期目录 | 过刊浏览

基于热力学模拟计算的CLF-1钢改良设计

杨栋天¹^,², 熊良银¹^,²(

), 廖洪彬³, 刘实¹^,²

^1.中国科学院金属研究所特种合金研究部沈阳 110016
^2.中国科学技术大学材料科学与工程学院沈阳 110016
^3.核工业西南物理研究院聚变科学所成都 610225

Improved Design of CLF-1 Steel Based on Thermodynamic Simulation

YANG Dongtian¹^,², XIONG Liangyin¹^,²(

), LIAO Hongbin³, LIU Shi¹^,²

^1.Special Alloy Research Department, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
^3.Southwestern Institute of Physics, Institute for Fusion Science, Chengdu 610225, China

引用本文:

杨栋天, 熊良银, 廖洪彬, 刘实. 基于热力学模拟计算的CLF-1钢改良设计[J]. 材料研究学报, 2023, 37(8): 590-602.
Dongtian YANG, Liangyin XIONG, Hongbin LIAO, Shi LIU. Improved Design of CLF-1 Steel Based on Thermodynamic Simulation[J]. Chinese Journal of Materials Research, 2023, 37(8): 590-602.

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摘要:

使用Thermo-Calc软件计算CLF-1钢中平衡析出相的成分和含量，研究了各平衡相中的元素分布随温度变化的规律、主元素对各相析出量、析出温度的影响，以及元素在各平衡相之间分配的规律；用透射电子显微镜(TEM)表征了添加Ti元素后析出相的尺寸和数密度。热力学计算结果表明：TaC相中C的分配量只占M₂₃C₆中C分配量的约3.3%。C元素的不均匀分配，是CLF-1钢中MX相析出量较低的主要原因之一；在不引入其它强碳化物形成元素的情况下，无法用提高C含量的方式使MX相中C的分配量提高；Cr含量的提高会降低TaC的析出温度，因此其含量不宜超过8.8%；W含量的提高会降低MX析出量，因此不宜超过1.5%；Mn元素对各析出相都没有显著的影响；N含量不宜超过0.02%；在CLF-1钢中添加0.2%Ti可使MX相在650℃的析出量提高9倍，C的分配量提高15倍。实验结果表明：0.2%的Ti元素可使M₂₃C₆的数密度降低21.5%，平均尺寸减小20 nm，并使MX相数密度提高4.7倍。这些结果，有力地验证了Ti元素对MX相析出的促进作用。

关键词 ：材料科学基础学科, 相图与相变, CLF-1钢改良, Thermo-Calc计算, MX相, 元素分配量

Abstract：

The composition and quantity of the equilibrium precipitated phases in CLF-1 steel were calculated by means of Thermo-calc software. The variation of element distribution in each equilibrium phase with temperature, the influence of main elements on the precipitation amount and temperature of each phase, and the partition of elements among equilibrium phases were investigated. Meanwhile, the size and number density of the precipitated phases were characterized by transmission electron microscopy (TEM). Thermodynamic calculation results show that the partition amount of C in TaC phase only accounts for about 3.3% of that in M₂₃C₆. The heterogeneous partition of C is one of the main reasons for the low MX phase precipitation in CLF-1 steel. Without introducing other strong carbide-forming elements, the partition amount of C in MX phase cannot be increased by increasing the C content. The increase of Cr content will reduce the precipitation temperature of TaC, so the Cr content should not exceed 8.8%. The increase of W content will reduce the amount of MX precipitation, so it should not exceed 1.5%. Mn has no significant effect on the amount of every precipitated phase. Finally, N content should not exceed 0.02%. The addition of 0.2%Ti in CLF-1 steel can increase the precipitation amount of MX phase at 650℃ by 9 times, and increase the partition amount of C by 15 times. The experiment result shows that: the addition of 0.2% Ti can reduce the number density of M₂₃C₆ by 21.5%, reduce its average size by 20 nm, and increase the number density of MX phase by 4.7 times. These results strongly verified the promoting effect of Ti element on MX phase precipitation.

Key words： foundational discipline in materials science phase transition and phase diagram improvement of CLF-1 steel thermo-Calc calculation MX phase elemental partitioning fraction

收稿日期: 2022-05-16

ZTFLH:

TG142

通讯作者: 熊良银，副研究员，lyxiong@imr.ac.cn，研究方向为核用结构材料及储氢材料

Corresponding author: XIONG Liangyin, Tel: 13840426146, E-mail: lyxiong@imr.ac.cn

作者简介: 杨栋天，男，1998年生，博士生

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表1 CLF-1钢的化学成分

图1 CLF-1钢中平衡析出相随温度的变化

图2 CLF-1钢中各析出相的析出温度随合金元素含量的变化

表2 CLF-1钢中析出相的主要合金元素

图3 CLF-1钢各析出相中元素的浓度随温度的变化

图4 基体中Fe、Cr和W元素分配量随温度的变化

图5 M23C6中Fe、Cr、W和C元素分配量随温度的变化

图6 MX中C、Ta、N和V元素分配量随温度的变化

图7 基体中C、Ta、N和V元素分配量随温度的变化

图8 C含量对CLF-1钢各相析出量的影响

图9 N含量对CLF-1钢各相析出量的影响

图10 Cr含量对CLF-1钢各相析出量的影响

图11 W含量对CLF-1钢各相析出量的影响

图12 Mn含量对CLF-1钢各相析出量的影响

图13 Ti含量对CLF-1钢各相析出量的影响

图14 Ti元素的添加对CLF-1钢中M23C6和MX相析出量的影响

图15 CNAS钢中M23C6和MX相的析出量随温度的变化

图16 MX中C、Ta、 N、V和Ti元素分配量随温度的变化

图17 1#试样中M23C6的TEM分析

图18 1#试样中MC的TEM分析

图19 2#试样中MC的TEM分析

表3 1#和2#试样中析出相的数密度和平均粒径

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