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Fig. 1.

Groove configuration of the dissimilar metal joint between HMn steel and STS 316L

Fig. 2.

Location of test specimens

Fig. 3.

Dissimilar metal joints for welding deformation measurement: (a) before welding, (b) after welding

Fig. 4.

Stress-strain curves of the DMWs using various welding fillers

Fig. 5.

Hardness profiles for various locations in the DMWs: (a) cap region, (b) root region

Fig. 6.

Transverse-weld specimens of DN fractured after bending test

Fig. 7.

Angular deformation for the DMW: (a) extracted section profile before welding, (b) extracted section profile after welding.

Fig. 8.

Microstructure of the fusion zone for various DSWs: (a) DM, (b) DS, (c) DN

Fig. 9.

Microstructure of the specimen DM for various locations in HAZ: (a) macro-view of the DMW, (b) near fusion line at the cap region of STS 316L side, (c) near fusion line at the root region of STS 316L side, (d) base metal of STS 316L, (e) near fusion line at the cap region of HMn side, (f) near fusion line at the root region of HMn side, (g) base metal of HMn steel

Fig. 10.

Phase analysis (IPF and phase map) near the fusion line of various DMWs: (a) location for EBSD examination, (b) color index of phase for Fig. 10c, (c) phase analysis for each location; ① DM: Weld–HAZ of HMn side, ② DM: Weld–HAZ of STS 316L side, ③ DS: Weld–HAZ of HMn side, ④ DS: Weld–HAZ of STS 316L side, ⑤ DN: Weld–HAZ of HMn side, ⑥ DN: Weld–HAZ of STS 316L side, (the red and white lines denote the fusion line) (d) phase fraction of Fig. 10c, (e) phase index for location ⑤ (Fig. 10c) to confirm the formation of hexagonal Fe₃C, (f) phase index for location ⑤ (Fig. 10c) to confirm no formation of ε–martensite

Fig. 11.

Microstructural prediction of dissimilar welds for various welding fillers [34]

Fig. 12.

Fractured surface of the specimen DN after the bending test: (a) fractured surface (x300), (b) enlarged fractured surface (x1500) at the red-square location in Fig. 12a, (c) EDS analysis of Nb precipitates at the red arrows in Fig. 12b, (d) the cross-section(x5000) of DN root weld, (e) EDS analysis in the locations ¨ç–¨é in Fig. 12d

Fig. 13.

Mapping of Nb solutes in the specimen DN: (a) macro view of the transverse DN, (b) Nb distribution at cap weld depicted in Fig. 12a, (c) Nb distribution at root weld depicted in Fig. 12a

Table 1.

Chemical composition of base materials (wt. %)

	C	Si	Mn	Ni	Cr	Mo
HMn steel	0.42	0.26	24.2	0.33	3.61	0.006
STS 316L	0.012	0.49	0.84	10.1	16.1	2.09

Table 2.

Chemical composition of filler metals (wt. %)

AWS Class No.	C	Si	Mn	Nb	Ni	Cr	Mo	Fe
ERFeMn-C(HMn steel)	0.39	0.42	22.71	-	2.49	2.94	1.51	Bal.
ER309LMo(STS 309LMo)	0.02	0.42	1.70	-	13.7	23.3	2.1	Bal.
ERNiCrMo-3(Inconel 625)	0.01	0.021	0.01	3.39	64.73	22.45	8.37	0.33

Table 3.

Welding parameters for dissimilar metal welding

DMWs	Filler Metal	Area	Max. Inter-pass Temp. (°C)	Current (A)	Voltage (V)	Travel Speed (cm/min.)	Heat Input (kJ/mm)
DM	HMn steel	Root	48	67	8.9	2.4	1.49
		Fill	115	132–202	9.3–14.0	9.4–18.0	0.72–1.70
		Cap	92	180–181	13.0	8.8–11.5	1.23–1.59
DS	STS 309LMo	Root	39	68	8.6	2.5	1.38
		Fill	120	130–205	9.1–13.5	8.4–15.0	0.76–1.89
		Cap	84	180–181	12.0–13.5	9.5–12.2	1.06–1.36
DN	Inconel 625	Root	20	77	8.8	2.9	1.41
		Fill	146	131–201	9.0–12.0	9.2–15.6	0.74–1.52
		Cap	86	180	10.5–11.0	10.4–10.7	1.06–1.13

Table 4.

Tensile properties of transverse and all-weld specimens using various welding fillers

ID	Transverse tensile test		All-weld tensile test
ID	TS (MPa)	YS ^(Ϯ1) (MPa)	TS (MPa)	YS ^(Ϯ1) (MPa)	EL ^(Ϯ2) (%)
DM	636	433	771	540	49
DS	644	433	676	550	42
DN	629	402	785	543	43

(Ϯ1) Yield strength was measured by 0.2% offset method.

(Ϯ2) Fracture elongation.

Table 5.

CVN impact properties for DMWs using various welding fillers

DMWs	Absorbed energy (Joule)				Lateral expansion (mm)
DMWs	1	2	3	Ave.	1	2	3	Ave.
DM	61	60	53	58	1.00	1.04	1.00	1.01
DS	45	56	57	53	0.72	0.81	0.87	0.80
DN	93	95	87	92	1.98	1.70	1.46	1.71

Table 6.

Angular deformation for various specimens and locations

DMWs	Deformation ratio (%)
DMWs	Face	Root	Ave.
DM	9.3	9.4	9.3
DS	8.2	8.3	8.3
DN	6.4	6.4	6.4

Table 7.

Typical coefficient of thermal expansion [26,27]

Fillers	Range (°C)	CTE (10^-6/°C)
HMn	25‒1000	22.7
STS 309LMo	20‒966	19.5
Inconel 625	20‒1000	17.4