一种核电用镍基合金焊丝熔敷金属的组织与性能

郭枭; 何鹏; 徐锴; 陈佩寅; 陈波; 霍树斌

doi:10.12073/j.hjxb.20191120002

一种核电用镍基合金焊丝熔敷金属的组织与性能

郭枭^{1, 2,},
何鹏^1, ,,
徐锴²,
陈佩寅³,
陈波³,
霍树斌³

1.
哈尔滨工业大学，先进焊接与连接国家重点试验室，哈尔滨，150001
2.
哈尔滨焊接研究院有限公司，哈尔滨，150028
3.
哈尔滨威尔焊接有限责任公司，哈尔滨，150028

基金项目: 国家科技重大专项资金资助项目(2018ZX06004001)

详细信息

作者简介:
郭枭，1988年出生，博士研究生，高级工程师；主要从事镍基合金焊接材料研究；发表论文10余篇；Email：guoxiaogarden@163.com.

通讯作者:
何鹏，教授，博士研究生导师；Email：hithepeng@hit.edu.cn.

中图分类号: TG 434
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出版历程
- 收稿日期: 2019-11-19
- 网络出版日期: 2020-07-26
- 刊出日期: 2020-07-26

Microstructure and mechanical properties of deposited metal for nuclear plant nickel alloy welding wire

GUO Xiao^{1, 2,},
HE Peng^1, ,,
XU Kai²,
CHEN Peiyin³,
CHEN Bo³,
HUO Shubin³

1.
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China
2.
Harbin Welding Institute Limited Company, Harbin 150028, China
3.
Harbin Well Welding Co.,Ltd., Harbin, 150028, China

摘要

摘要: 通过采用JMatPro软件，OM，SEM，TEM等手段分析了试制镍基合金焊丝GTAW熔敷金属的组织与力学性能. 结果表明：试验焊丝熔敷金属金相组织主要由柱状树枝晶γ相(NiCrFe固溶体)、枝晶间富Mo和Nb的偏析γ相以及枝晶间分布的(Nb,Ti)C碳化物、(Ni,Cr,Fe)₂(Nb,Mo)型Laves相、MoCrFe型σ相等组成. Mo，Nb等元素在组织中存在偏析现象，相比于焊丝化学成分，熔敷金属中枝晶干γ相Fe含量较高，Mo，Nb含量较低，而枝晶间Mo，Nb含量较高、Fe含量较低. 熔敷金属室温、350 ℃高温抗拉及屈服强度较高、塑性较好，室温拉伸断口形貌以沿晶分布的韧窝为主，在韧窝底部存在密集的析出相.
- 镍基合金 /
- 核电 /
- Laves相 /
- σ相
Abstract: Microstructure and mechanical properties of deposited metal with experimental nickel alloy wires by GTAW was investigated by JMatPro software, OM, SEM, TEM etc. Results indicated that there were columnar γ matrix, interdentritic precipitates including σ phase, MC carbides, Laves phases in the deposited metal. Compared with nominal chemical compositions, dendrite core has higher Fe content and lower Nb, Mo content, while interdendritic segregation zone has higher Nb, Mo content and lower Fe content. MC carbide was (Nb,Ti)C, Laves is rich in Mo and Cr with structural formula (Ni,Cr,Fe)₂(Nb,Mo), σ phases is rich in Mo and Cr with MoCrFe tetragonal structure. The deposited metal has high strength and good ductility at room temperature and 350 ℃. Dimples along grain boundary dominants the fracture morphology of tensile specimen at room temperature, with dense precipitates in the bottom of dimples.
- nickel alloy /
- nuclear plant /
- Laves phase /
- σ phase

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图 1 熔敷金属制备示意图

Figure 1. Schematic diagram of deposited metal sample preparation

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图 2 基于焊丝化学成分的平衡相JMatPro计算结果

Figure 2. Calculated results of equilibrium phases based on experimental wire chemical composition by JMatPro

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图 3 熔敷金属金相组织

Figure 3. Metallographic microstructure of deposited metal. (a) typical field； (b) detailed view as marked in Fig.3a

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图 4 熔敷金属SEM微观形貌

Figure 4. Microstructure of deposited metal by SEM

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图 5 共晶组织背散射像

Figure 5. Eutectic microstructure BSE images

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图 6 元素分布EPMA面扫描分析结果

Figure 6. Analysis results of element distribution by EPMA

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图 7 熔敷金属第二相TEM像及对应的选区电子衍射结果

Figure 7. TEM images of precipitates and SAED results by TEM. (a) dark field image; (b) σ SAED;(c) MC SAED

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图 8 室温拉伸断口SEM形貌

Figure 8. Fracture surface morphology of tensile specimen at room temperature by SEM

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表 1 GTAW工艺参数

Table 1 GTAW parameters

焊接电流I/A	电弧电压U/V	焊接速度v₁/(mm·min⁻¹)	送丝速度v₂/(mm·min⁻¹)	保护气体	层温控制T/℃
220	13.5	120	1 150	纯Ar	≤ 150

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表 2 试验用焊丝的化学成分(质量分数，%)

Table 2 Chemical compositions of experimental wire

C	Si	Mn	S	P	Nb	Fe	Mo	Al	Ti	Cr	Ni
0.02	0.07	0.96	0.001	0.002	2.01	9.44	5.06	0.28	0.20	29.02	余量

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表 3 熔敷金属各典型相能谱分析结果(质量分数，%)

Table 3 EDS results of typical phases in deposited metal

分析区域	Nb	Mo	Ti	Ni	Cr	Fe
A	0.87	4.64	0.09	52.02	30.17	11.54
B	2.69	6.91	0.50	48.41	30.40	9.11
C1	5.17	17.18	—	32.17	35.31	7.13
C2	5.32	17.21	—	31.31	35.11	7.23
D1	22.06	9.69	0.08	32.98	20.16	5.65
D2	19.21	10.69	—	33.25	21.92	6.35
E	30.01	3.73	9.23	14.27	11.78	3.29

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参考文献(12)

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