The addition of active elements during cladding will affect the molten pool flow, and different concentrations have different flow states. In this paper, a numerical model of heat-flow coupling in the ASTM 1045 laser cladding Fe60 process was established and the effects of different concentrations of S, O, and Se elements on the molten pool flow state were calculated and revealed. The results show that there is a critical concentration (CC) when the active element affects the molten pool flow. When the concentration is lower than CC, the flow direction of the melt in the molten pool is from the center to the edge. With the increase in concentration, the flow velocity of the molten pool gradually decreases. When the concentration of active elements reaches CC, the flow direction of the melt changes, but the concentration will make the molten pool flow disorderly appear. The concentration at which the melt flow direction begins to change is called the initial critical concentration (ICC), and the concentration at the end of the change in the melt flow direction (completely reversed) is called the perfect critical concentration (PCC). In the experiment, ICC and PCC intervals are not suitable for concentration selection. When the concentration of active elements exceeds PCC, the flow direction of molten pool does not change. The flow velocity of the molten pool gradually increases with the increase in the active element concentration. The morphology and microstructure of the cladding layer were analyzed with the same technological parameters. The effectiveness of numerical simulation is verified.

1.
G.
Zhang
,
A.
Feng
,
P.
Zhao
,
X.
Pan
, and
H.
Feng
, “
Effect of energy density on the microstructure and wear resistance of nickel-based WC coatings by laser cladding of preset Zr702 alloy plates
,”
Coatings
13
,
826
–837 (
2023
).
2.
B. A.
Khamidullin
,
I. V.
Tsivilskiy
,
A. I.
Gorunov
, and
A.Kh
Gilmutdinov
, “
Modeling of the effect of powder parameters on laser cladding using coaxial nozzle
,”
Surf. Coat. Technol.
364
,
430
443
(
2019
).
3.
Z.
Xu
,
F.
Wang
,
S.
Peng
,
W.
Liu
, and
J.
Guo
, “
Effects of process parameters on microstructure and high-temperature oxidation resistance of laser-clad IN718 coating on Cr5Mo steel
,”
Coatings
13
,
197
–216 (
2023
).
4.
T.
Yamaguchi
,
K.
Tanaka
, and
H.
Hagino
, “
Porosity reduction in WC-12Co laser cladding by aluminum addition
,”
Int. J. Refract. Met. Hard Mater.
110
,
106020
(
2023
).
5.
H.
Wang
,
Y.
Cheng
,
J.
Yang
, and
X.
Liang
, “
Microstructure and properties of Fe based amorphous coatings deposited by laser cladding under different preheating temperatures
,”
J. Non-Cryst. Solids
602
,
122081
(
2023
).
6.
L.
Chang
,
Y.
Yanpeng
,
L.
Zhaotai
,
H.
Xin
, and
J.
Tenghui
, “
Differential analysis of the influence mechanism of ultrasonic vibrations on laser cladding
,”
CIRP J. Manuf. Sci. Technol.
38
,
16
37
(
2022
).
7.
K.
Qi
and
L.
Jiang
, “
Effect of Y2O3 on the microstructures and properties of magnetic field-assisted laser-clad Co-based alloys
,”
J. Mater. Eng. Perform.
33
,
1
13
(
2023
).
8.
R.
Chen
,
G.
Yu
,
X.
He
,
Z.
Gan
, and
S.
Li
, “
The diffusion of S in 38MnVS6 steel significantly influences the morphology and microstructure of laser cladding layers
,”
Chin. J. Lasers
45
,
0602005
(
2018
).
9.
B.
Ribic
,
S.
Tsukamoto
,
R.
Rai
, and
T.
DebRoy
, “
Role of surface-active elements during keyhole-mode laser welding
,”
J. Phys. D
44
,
485203
(
2011
).
10.
Z.
Gan
,
G.
Yu
,
X.
He
, and
S.
Li
, “
Surface-active element transport and its effect on liquid metal flow in laser-assisted additive manufacturing
,”
Int. Commun. Heat Mass Transfer
86
,
206
214
(
2017
).
11.
T.
Matsushita
,
I.
Belov
,
D.
Siafakas
,
A. E. W.
Jarfors
, and
M.
Watanabe
, “
Interfacial phenomena between molten iron and molten slag—Effect of nitrogen on the Marangoni convection
,”
J. Mater. Sci.
56
,
7811
7822
(
2021
).
12.
T.
Jia
,
C.
Li
,
S.
Deng
,
M.
Zhang
, and
X.
Han
, “
Parameter sensitivity evaluation of the laser cladding for Fe60 powder with different sulfur contents
,”
Appl. Phys. A
128
,
1039
–1060 (
2022
).
13.
T.
Jia
,
C.
Li
,
S.
Jia
,
Y.
Liu
, and
X.
Han
, “
Influence mechanism of active elements on multi-field coupling in laser cladding Fe60 process
,”
Int. J. Adv. Manuf. Technol.
124
,
411
428
(
2023
).
14.
Z.
Shu
,
G.
Yu
,
B.
Dong
,
X.
He
,
Z.
Li
, and
S.
Li
, “
Role of surface-active element sulfur on thermal behavior, driving forces, fluid flow and solute dilution in laser linear welding of dissimilar metals
,”
Materials
16
,
2609
–2628 (
2023
).
15.
Z.
Gan
,
G.
Yu
,
X.
He
, and
S.
Li
, “
Numerical simulation of thermal behavior and multicomponent mass transfer in direct laser deposition of Co-base alloy on steel
,”
Int. J. Heat Mass Transfer
104
,
28
38
(
2017
).
16.
X.
Han
,
C.
Da Zhang
,
C.
Li
,
Z. B.
Yu
, and
B.
Zhang
, “
Study on a multifield coupling mechanism and a numerical simulation method of a pulsed laser deposition process from a disk laser
,”
Appl. Phys. A
127
,
1
19
(
2021
).
17.
C.
Li
,
D.
Zhang
,
X.
Gao
, and
X.
Han
, “
Numerical simulation method of the multi-field coupling mechanism for laser cladding 316L powder
,”
Weld. World
66
,
1
18
(
2022
).
18.
Y.
Jiang
,
Y.
Cheng
,
X.
Zhang
,
J.
Yang
,
X.
Yang
, and
Z.
Cheng
, “
Simulation and experimental investigations on the effect of Marangoni convection on thermal field during laser cladding process
,”
Optik
203
,
164044
(
2020
).
19.
Q.
Chai
,
C.
Fang
,
J. Y.
Hu
,
Y.
Xing
, and
D. L.
Huang
, “
Cellular automaton model for the simulation of laser cladding profile of metal alloys
,”
Mater. Des.
195
,
109033
109043
(
2020
).
20.
J.
Song
,
Y.
Chew
,
G.
Bi
,
X.
Yao
,
B.
Zhang
,
J.
Bai
, and
S. K.
Moon
, “
Numerical and experimental study of laser aided additive manufacturing for melt-pool profile and grain orientation analysis
,”
Mater. Des.
137
,
286
297
(
2018
).
21.
Z.
Gan
,
H.
Liu
,
S.
Li
,
X.
He
, and
G.
Yu
, “
Modeling of thermal behavior and mass transport in multi-layer laser additive manufacturing of Ni-based alloy on cast iron
,”
Int. J. Heat Mass Transfer
111
,
709
722
(
2017
).
22.
H.
Tian
,
X.
Chen
,
Z.
Yan
,
X.
Zhi
,
Q.
Yang
, and
Z.
Yuan
, “
Finite-element simulation of melt pool geometry and dilution ratio during laser cladding
,”
Appl. Phys. A
125
,
1
9
(
2019
).
23.
P.
Sahoo
,
T.
Debroy
, and
M. J.
McNallan
, “
Surface tension of binary metal-surface active solute systems under conditions relevant to welding metallurgy
,”
Metall. Trans. B
19
,
483
491
(
1988
).
24.
Y.
Du
,
Y.
Peng
,
K.
Mao
,
G.
He
, and
L.
Zhang
, “
Effect of laser specific energy on mechanical properties of Fe60 coatings by laser cladding
,”
Opt. Laser Technol.
172
,
110497
(
2024
).
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