Effect of Interlayer on Microstructures and Properties of 304 Stainless Steel/Nb Joints by Laser Welding

Material	C	Mn	Nb	Fe	Ti	Zr	W	Ni	Mo
Nb	≤0.01	-	Bal.	≤0.005	≤0.002	≤0.02	≤0.03	≤0.005	≤0.01
304 SS	≤0.08	≤2.0	-	Bal.	-	-	-	8-11	-
Material	Cr	Si	Ta	N	O	H	P	S	Cr
Nb	≤0.002	≤0.005	≤0.1	≤0.015	≤0.015	≤0.001	-	-	≤0.002
304 SS	18-20	≤1.0	-	-	-	-	≤0.045	≤0.03	18-20

Table 2. Physical parameters of Nb and 304 SS at room temperature
View table
Table 2. Physical parameters of Nb and 304 SS at room temperature
Material Melting point /℃ Specific heat /(J·kg^-1·K^-1) Thermal conductivity /(W·m^-1·K^-1) Linear expansioncoefficient /(10^-6·K^-1)
Nb 2469 27 53.7 7.1
304 SS 1450 461 14.6 16.0

Table 3. Fracture EDS of joint by direct welding ( atomic fraction, %)
View table
Table 3. Fracture EDS of joint by direct welding ( atomic fraction, %)
Position Fe Nb Cr Ni
1' 38.78 46.46 10.85 3.91
2' 75.09 13.54 11.37 0

Table 4. Chemical compositions of various phases marked in Fig. 6 (atomic fraction, %)
View table
Table 4. Chemical compositions of various phases marked in Fig. 6 (atomic fraction, %)
Phase Fe Ag Cr Ni Cu
a 4.11 0 1.16 1.57 93.15
b 72.20 0 15.56 1.79 10.45
c 0 100 0 0 0
d 0 100 0 0 0

Table 5. Chemical compositions of various zones marked in Fig. 7 (atomic fraction, %)
View table
Table 5. Chemical compositions of various zones marked in Fig. 7 (atomic fraction, %)
Area Fe Mo Cr Ni V W Ta Nb
1 44.18 38.13 14.03 3.65 0 0 0 0
2 36.22 0 10.28 4.00 40.48 0 0 9.03
3 6.43 0 0 0 0 93.57 0 0
4 33.55 0 9.87 3.46 0 0 53.11 0

Table 6. Chemical compositions of various phases marked in Fig. 9 (atomic fraction, %)

View table

Table 6. Chemical compositions of various phases marked in Fig. 9 (atomic fraction, %)

Phase	Fe	Nb	Cr	Ni	Cu
A	51.09	27.41	14.21	4.30	3.00
B	61.01	11.29	16.00	5.58	6.12
C	6.24	-	2.22	-	91.54
D	65.80	-	13.40	1.96	18.84
E	7.36	-	2.01	1.34	89.29
F	60.90	7.97	17.79	3.69	9.66
G	3.90	-	0.82	-	95.28
H	66.44	-	18.84	3.61	11.11
J	4.11	-	1.16	1.57	93.15
K	72.20	-	15.56	1.79	10.45

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Shi Mingxiao, Chen Shujin, Hu Qingxian, Liu Dashuang, Zhou Fangming, Li Ruifeng, Zhao Jian. Effect of Interlayer on Microstructures and Properties of 304 Stainless Steel/Nb Joints by Laser Welding[J]. Chinese Journal of Lasers, 2017, 44(11): 1102005

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Paper Information

Category: laser manufacturing

Received: Jun. 16, 2017

Accepted: --

Published Online: Nov. 17, 2017

The Author Email: Mingxiao Shi (smx_just@163.com)

DOI:10.3788/CJL201744.1102005

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Chemical compositions of Nb and 304 SS (mass fraction, %)

Table 1. Chemical compositions of Nb and 304 SS (mass fraction, %)

Table 2. Physical parameters of Nb and 304 SS at room temperature

Table 2. Physical parameters of Nb and 304 SS at room temperature

Table 3. Fracture EDS of joint by direct welding ( atomic fraction, %)

Table 3. Fracture EDS of joint by direct welding ( atomic fraction, %)

Table 4. Chemical compositions of various phases marked in Fig. 6 (atomic fraction, %)

Table 4. Chemical compositions of various phases marked in Fig. 6 (atomic fraction, %)

Table 5. Chemical compositions of various zones marked in Fig. 7 (atomic fraction, %)

Table 5. Chemical compositions of various zones marked in Fig. 7 (atomic fraction, %)

Table 6. Chemical compositions of various phases marked in Fig. 9 (atomic fraction, %)

Table 6. Chemical compositions of various phases marked in Fig. 9 (atomic fraction, %)