调质处理对CLAM钢焊缝抗辐照性能的影响

雷玉成; 刘丹; 姚奕强; 丁祥彬; 朱强

doi:10.12073/j.hjxb.20200528001

调质处理对CLAM钢焊缝抗辐照性能的影响

1.
江苏大学，镇江，212013
2.
中广核研究院有限公司，深圳，518000

基金项目: 国家自然科学基金资助项目(51875264)

详细信息

作者简介:
雷玉成，1962年出生，博士，教授，博士研究生导师. 主要研究方向为先进连接方法、焊接过程控制和模拟. 发表论文150余篇. Email: yclei@ujs.edu.cn.

中图分类号: TG 441.8
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出版历程
- 收稿日期: 2020-05-27
- 网络出版日期: 2020-10-15
- 刊出日期: 2020-10-15

Investigation on the radiation resistance of quenching and tempering CLAM steel weld

1.
Jiangsu University, Zhenjiang 212013, China
2.
China General Nuclear Power Corporation, Shenzhen 518000, China

摘要

摘要: 焊接是聚变堆包层装配的重要手段，开展焊缝的离子辐照效应研究对于提高核反应堆核心部件的使用寿命具有重要意义. 为对比研究中国低活化马氏体钢(China low activation martensitic，CLAM)焊态焊缝和调质处理焊缝的离子辐照效应，试验采用150 keV的He⁺在室温下对CLAM钢焊缝进行离子辐照. 利用X射线衍射(X-ray diffraction，XRD)和连续刚度纳米压痕技术(continuous stiffness measurement，CSM)等检测方法研究两种状态的焊缝辐照前后晶体结构和力学性能的变化. 结果表明，在15 dpa辐照剂量下，焊缝均出现了衍射峰的半峰宽宽化和衍射角向小角度偏移，以及焊态焊缝的衍射峰强度降低；焊缝的力学性能均有明显的辐照硬化和弹性模量降低. 但与焊态焊缝相比，调质处理后焊缝的辐照效应相对较弱，说明调质处理可以有效提高CLAM钢焊缝的抗辐照性能.
- CLAM钢焊缝 /
- He⁺辐照 /
- XRD测试 /
- 纳米压痕技术 /
- 辐照损伤
Abstract: Welding is an important mean of assembling the cladding layer of fusion reactor. The study of ion irradiation effect of weld is of great significance for improving the service life of nuclear reactor core components. In order to compare the ion irradiation effect of China low activated martensitic steel (CLAM) welded weld and tempered weld, the welds were subjected to He⁺ irradiation at room temperature of 150 keV. X-ray diffraction (XRD) and continuous stiffness nano-indentation technique (CSM) were used to study the changes of the crystal structure and the mechanical properties of the weld in two states before and after irradiation. The results show that under 15dpa ion irradiation, the peak width widens and the diffraction angle shifts to small angle in the weld, moreover, the diffraction peak intensity of welded weld reduces. In addition, the irradiation hardening and the elastic modulus decreasing occur in the weld after irradiation. However, compared with the welded weld, the irradiation effect of the tempered weld is relatively weak, indicating that the anti-irradiation performance of CLAM steel weld can be improved by quenching and tempering.
- CLAM steel weld /
- He⁺ irradiation /
- X-ray diffraction test /
- nano-indentation technique /
- irradiation damage

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图 1 注入的氦浓度分布和辐照损伤量分布

Figure 1. Distribution of injection helium concentration and radiation damage. (a) helium concentration dependence of depth; (b) irradiation damage dependence of depth

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图 2 压头压入材料的剖面图和压头的俯视投影图

Figure 2. Cross section and top view of indenter

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图 3 典型的载荷—位移曲线

Figure 3. A typical load-displacement curve

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图 4 CLAM钢焊缝辐照前后的衍射光谱图

Figure 4. The diffraction spectra of CLAM weld before and after irradiation. (a) diffraction spectra of CLAM weld; (b) diffraction spectra of main diffraction peak

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图 5 CLAM钢焊缝辐照前后表面形貌扫描图

Figure 5. Scanned surface morphology of the weld after irradiation of CLAM steel welds. (a) irradiated as welded weld;(b) irradiated tempered weld;(c) unirradiated as welded weld;(d) unirradiated tempered weld

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图 6 CLAM钢焊缝辐照前后微观应变的变化

Figure 6. Changes in the microscopic strain of CLAM steel welds before and after irradiation

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图 7 CLAM钢焊缝辐照后载荷随压入深度的变化

Figure 7. The change of the irradiation load of CLAM steel weld with the pressing depth

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图 8 CLAM钢焊缝辐照前后硬度随压入深度变化

Figure 8. The changing hardness of CLAM steel welds with depth before and after irradiation. (a) hardness dependence of depth; (b) H² dependence of h⁻¹

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图 9 辐照前后焊缝的硬度比较

Figure 9. Comparison of weld hardness before and after irradiation

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图 10 CLAM钢焊缝辐照前后弹性模量的变化

Figure 10. Changes of CLAM steel welds before and after irradiation. (a) elastic modulus dependence of depth; (b) comparison of elastic modulus

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表 1 CLAM钢的化学成分(质量分数，%)

Table 1 Chemical composition of CLAM steel

C	Cr	W	V	Mn	Ta	Ni	Si	S	P	Fe
0.12	8.9	1.44	0.20	0.35	0.15	0.02	0.08	0.003	< 0.0005	余量

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表 2 CLAM钢焊接参数

Table 2 Welding parameters of CLAM steel

焊层	焊接电流 I/A	焊接电压 U/V	焊接速度 v/(mm·s⁻¹)	氩气流量 q/(L·min⁻¹)
打底焊	120	12	1	10
盖面焊	125	12	1	10

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表 3 XRD统计获得的CLAM钢焊缝辐照前后衍射峰的变化

Table 3 The changes of diffraction peak of CLAM steel weld before and after irradiation were obtained by XRD

样品		半峰宽w/(°)	宽化率λ(%)	强度I(a.u.)	衍射角2θ/(°)	峰的偏移δ/(°)
焊态焊缝	未辐照	0.252	43.3	1064	44.944	小角度偏移0.154
焊态焊缝	辐照	0.361	43.3	596	44.790	小角度偏移0.154
调质处理焊缝	未辐照	0.146	28.1	1086	44.927	小角度偏移0.118
调质处理焊缝	辐照	0.187	28.1	1199	44.809	小角度偏移0.118

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