热时效对含硅铁素体/马氏体钢力学性能的影响

刘肖; 王辉; 肖军; 孙永铎; 刘帅洋; 张金钰

doi:10.13832/j.jnpe.2023.S1.0147

热时效对含硅铁素体/马氏体钢力学性能的影响

doi: 10.13832/j.jnpe.2023.S1.0147

1.
中国核动力研究设计院核反应堆燃料及材料重点实验室，成都，610213
2.
西安交通大学金属材料强度国家重点实验室，西安，710049

详细信息

作者简介:
刘　肖（1989—），女，硕士研究生，现主要从事反应堆结构材料工艺与性能方面的研究，E-mail: 18280008908@126.com

中图分类号: TL334
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- 被引次数: 0
出版历程
- 收稿日期: 2022-12-15
- 修回日期: 2023-03-13
- 刊出日期: 2023-06-15

Effect of Thermal Aging on Mechanical Properties of Silicon-containing Ferritic/Martensitic Steel

1.
Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China
2.
State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, China

摘要

摘要: 对4种不同Si含量的9Cr-铁素体/马氏体（F/M）钢开展550℃热时效实验（最长时间为5000 h），测试其屈服强度（R_p0.2）、抗拉强度（R_m）、延伸率（A）等力学性能，并结合扫描电子显微镜/能谱仪（SEM/EDS）、透射电子显微镜（TEM）表征手段，研究微观组织结构与力学性能之间的关联规律。结果表明：添加少量的Si可以提高9Cr-F/M钢的强度，且Si含量（质量分数）为0.7%时，R_p0.2和R_m达到最大值，但Si的添加会促进Laves相析出；时效时间（t）对9Cr-F/M钢的塑性有显著影响，当t＜2500 h时，9Cr-F/M钢的塑性变化不大，但当Si含量提高至1.0%，经5000 h时效后塑性大幅下降，这归因于Laves相在晶界的析出和长大。
- 铁素体/马氏体（F/M）钢 /
- 热时效 /
- 力学性能 /
- 显微组织 /
- Laves相
Abstract: Four kinds of 9Cr- ferritic/martensitic (F/M) steels with different Si contents were heat aged at 550°C (the longest time was 5000 h), and their mechanical properties such as yield strength (R_p0.2), tensile strength (R_m) and elongation (A) were tested. The relationship between microstructure and mechanical properties was studied by means of scanning electron microscope/energy dispersive spectrometer (SEM/EDS) and transmission electron microscope (TEM). The results show that the strength of 9Cr-F/M steel can be improved by adding a small amount of Si, and when the Si content (mass fraction) is 0.7%, R_p0.2 and R_m reach the maximum, but the addition of Si will promote Laves phase precipitation. Aging time (t) has a significant effect on the plasticity of 9Cr-F/M steel. When t < 2500 h, the plasticity of 9Cr-F/M steel has little change, but when the Si content is increased to 1.0%, the plasticity decreases greatly after aging for 5000 h, which is attributed to the precipitation and growth of Laves phase at the grain boundary.
- Ferritic/Martensitic (F/M) Steel /
- Thermal aging /
- Mechanical properties /
- Microstructure /
- Laves phase

HTML全文

图 1 拉伸性能测试样品 mm

Figure 1. Tensile Test Sample

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图 2 不同Si含量F/M钢时效前与5000 h后样品的TEM形貌

Figure 2. TEM Image of F/M Steel Sample with Different Si Content before Aging and after 5000 h

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图 3 马氏体板条宽度随t变化曲线

Figure 3. Variation Curve of Martensitic Slat With t

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图 4 R_p0.2随t变化曲线

Figure 4. Variation Curve of R_p0.2 with t

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图 5 R_m随t变化曲线

Figure 5. Variation Curve of R_m with t

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图 6 A随t变化曲线

Figure 6. Variation Curve of A with t

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表 1 不同Si含量F/M钢在不同t的力学性能

Table 1. Mechanical Properties of F/M Steel with Different Si Content at Different t

序号	Si含量/%	t /h	弹性模量（E）/MPa	R_p0.2/MPa	R_m/MPa	A/%	断面收缩率（Z）/%
1	0	0	211842	645	755	20.8	74.2
2		1000	204819	655	748	13.4	73.4
3		2500	206535	660	759	16.9	72.2
4		5000	205648	652	757	17.1	68.1
5	0.4	0	216468	613	735	18.2	70.8
6		1000	204832	619	732	19.0	71.9
7		2500	206685	614	731	20.4	69.4
8		5000	206728	579	711	19.3	67.0
9	0.7	0	217544	703	806	17.9	69.3
10		1000	210522	716	816	16.8	67.9
11		2500	208771	699	812	17.8	66.0
12		5000	210745	700	816	16.2	63.4
13	1.0	0	214690	657	789	18.9	68.4
14		2500	207019	666	792	19.2	64.0
15		5000	209741	668	809	13.2	57.5

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