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Frontiers of Mechanical Engineering

Front. Mech. Eng.    2018, Vol. 13 Issue (4) : 513-519
Influence of the field humiture environment on the mechanical properties of 316L stainless steel repaired with Fe314
Lianzhong ZHANG, Dichen LI(), Shenping YAN, Ruidong XIE, Hongliang QU
State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, China
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The mechanical properties of 316L stainless steel repaired with Fe314 under different temperatures and humidities without inert gas protection were studied. Results indicated favorable compatibility between Fe314 and 316L stainless steel. The average yield strength, tensile strength, and sectional contraction percentage were higher in repaired samples than in 316L stainless steel, whereas the elongation rate was slightly lower. The different conditions of humiture environment on the repair sample exerted minimal influence on tensile and yield strengths. The Fe314 cladding layer was mainly composed of equiaxed grains and mixed with randomly oriented columnar crystal and tiny pores or impurities in the tissue. Results indicated that the hardness value of Fe314 cladding layer under different humiture environments ranged within 419–451.1 HV0.2. The field humiture environment also showed minimal impact on the average hardness of Fe314 cladding layers. Furthermore, 316L stainless steel can be repaired through laser cladding by using Fe314 powder without inert gas protection under different temperatures and humidity environments.

Keywords laser cladding      repaired performance      tensile strength      temperature and humidity environment     
Corresponding Authors: Dichen LI   
Just Accepted Date: 09 March 2018   Online First Date: 28 April 2018    Issue Date: 31 July 2018
 Cite this article:   
Lianzhong ZHANG,Dichen LI,Shenping YAN, et al. Influence of the field humiture environment on the mechanical properties of 316L stainless steel repaired with Fe314[J]. Front. Mech. Eng., 2018, 13(4): 513-519.
Group number Environmental combination Average temperature/°C Relative humidity/%
a Medium temperature and humidity (MTH) 24 55.0
b Medium temperature and high humidity(MTHH) 21 78.7
c Low temperature and medium humidity (LTMH) –8 60.0
d High temperature and dry (HTD) 44.6 14.0
Tab.1  Environmental combinations of various temperatures and humidities
Powder composition Weight percentage/%
Fe 73
Cr 15
Ni 10
Si 1
B 1
Mo 0
Tab.2  Fe314 powder component
Fig.1  Laser cladding system
Parameter Value
Spot diameter/mm 0.5
Scanning speed/(mm·s–1) 10
Powder supply ratio/(g·min–1) 2
Laser power/W 105
Layer thickness/mm 0.1
Tab.3  Summary of processing parameters
Fig.2  Cladding results
Fig.3  Broken samples after tensile testing
Serial number Yield strength, Rp0.2/MPa Tensile strength, Rm/MPa Elongation rate, A% Reduction in area, Z/%
Samples value Average value Samples value Average value Samples value Average value Samples value Average value
a 484 491.7 662 672 38.5 36.5 80 80
492 674 36.5 80
499 680 34.5 80
b 509 514.7 675 672 39.0 37.2 81 80.6
516 666 36.5 81
519 675 36.0 80
c 502 503 673 667 35.5 36.7 81 80
492 655 37.0 80
515 673 37.5 79
d 495 510.3 670 676.3 39.0 37.2 80 80.3
507 680 38.0 81
529 679 34.5 80
Tab.4  Tensile testing results
Fig.4  Comparison of the yield and tensile strengths for samples formed under various environmental combinations
Fig.5  Fe314 microstructure for the cladded layer formed under different temperaturesand humidity environments. (a) Fe314 microstructure of the cladded layer in medium temperature and humid environments (magnification: Left 500×; right 1000×); (b) Fe314 microstructure of the cladded layer in medium temperature and high humidity environments (magnification: Left 500×; right 1000×); (c) Fe314 microstructure of the cladded layer in low temperature and medium humidity environments (magnification: Left 500×; right 1000×); (d) Fe314 microstructure of the cladded layer in high temperature and dry environments (magnification: Left 500×;right 1000×)
Fig.6  Joint surfacemicrostructure. (a) Joint surfacemicrostructure of medium temperature and medium humidity environment; (b) joint surface microstructure of low temperature and medium humidity environment
Fig.7  Fe314 material cladding layer hardness value under different temperaturesand humidity conditions
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