Influence of laser power on microstructure of laser metal deposited 17-4 ph stainless steel
- Adeyemi, A.A., Akinlabi, Esther Titilayo, Mahamood, R.M., Sanusi, K.O., Pityana, S., Tlotleng, M.
- Authors: Adeyemi, A.A. , Akinlabi, Esther Titilayo , Mahamood, R.M. , Sanusi, K.O. , Pityana, S. , Tlotleng, M.
- Date: 2017
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/244692 , uj:25306 , Citation: Adeyemi, A.A. et al. 2017. Influence of laser power on microstructure of laser metal deposited 17-4 ph stainless steel.
- Description: Abstract: The influence of laser power on the microstructure of 17-4 PH stainless steel produced by laser metal deposition was investigated. Multiple-track of 17-4 stainless steel powder was deposited on 316 stainless steel substrate using laser metal deposition, an additive manufacturing process. In this research, laser power was varied between 1.0 kW and 2.6 kW with scanning speed fixed at 1.2 m/s. The powder flow rate and the gas flow rate were also kept constant at values of 5 g/min and 2 l/min respectively. The microstructure was studied under optical microscope and it revealed that the microstructure was dendritic in structure with finer and lesser δ-ferrite at low laser power while the appearance of coarse and more δ-ferrite are seen at higher laser power.
- Full Text:
- Authors: Adeyemi, A.A. , Akinlabi, Esther Titilayo , Mahamood, R.M. , Sanusi, K.O. , Pityana, S. , Tlotleng, M.
- Date: 2017
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/244692 , uj:25306 , Citation: Adeyemi, A.A. et al. 2017. Influence of laser power on microstructure of laser metal deposited 17-4 ph stainless steel.
- Description: Abstract: The influence of laser power on the microstructure of 17-4 PH stainless steel produced by laser metal deposition was investigated. Multiple-track of 17-4 stainless steel powder was deposited on 316 stainless steel substrate using laser metal deposition, an additive manufacturing process. In this research, laser power was varied between 1.0 kW and 2.6 kW with scanning speed fixed at 1.2 m/s. The powder flow rate and the gas flow rate were also kept constant at values of 5 g/min and 2 l/min respectively. The microstructure was studied under optical microscope and it revealed that the microstructure was dendritic in structure with finer and lesser δ-ferrite at low laser power while the appearance of coarse and more δ-ferrite are seen at higher laser power.
- Full Text:
Constrained bending and straightening - a proposed method for severe plastic deformation of metals
- Mwita, W.M., Akinlabi, Esther Titilayo, Sanusi, K.O.
- Authors: Mwita, W.M. , Akinlabi, Esther Titilayo , Sanusi, K.O.
- Date: 2018
- Language: English
- Type: Conference proceeding
- Identifier: http://hdl.handle.net/10210/291184 , uj:31616 , Citation: Mwita, W.M., Akinlabi, E.T. & Sanusi, K.O. 2018. Constrained bending and straightening - a proposed method for severe plastic deformation of metals.
- Description: Abstract: The use of severe plastic deformation (SPD) technology to process ultra-fine/nano grains metals with enhanced desired properties for structural and biomedical applications have shown good results. However, SPD technology is still limited to discrete processes, small size samples with inhomogeneous strain. This paper proposes a new method for severe plastic deformation of metals known as constrained bending and straightening (CBS). The method is aimed to provide continuous production of ultra-fine/nano grains metals with improved strain homogeneity. The CBS process analytical model and its working principle are presented, a constitutive relation of feed length, bend roller diameter, effective strain and tensile strength is established. Results show that the magnitude and homogeneity of induced effective strain and tensile strength increase with the decrease of both feed length and bending roller diameter. Effective strain increased by 200% from 6mm to 2mm feed lengths. At 2mm feed length, tensile stress increased from 1223.8 MPa at 1 pass to 1302.5 MPa at 4 pass. Results from this study promise that CBS technique is potential to be adapted for continuous SPD of bulky length metal sheets with enhanced homogeneous properties.
- Full Text:
- Authors: Mwita, W.M. , Akinlabi, Esther Titilayo , Sanusi, K.O.
- Date: 2018
- Language: English
- Type: Conference proceeding
- Identifier: http://hdl.handle.net/10210/291184 , uj:31616 , Citation: Mwita, W.M., Akinlabi, E.T. & Sanusi, K.O. 2018. Constrained bending and straightening - a proposed method for severe plastic deformation of metals.
- Description: Abstract: The use of severe plastic deformation (SPD) technology to process ultra-fine/nano grains metals with enhanced desired properties for structural and biomedical applications have shown good results. However, SPD technology is still limited to discrete processes, small size samples with inhomogeneous strain. This paper proposes a new method for severe plastic deformation of metals known as constrained bending and straightening (CBS). The method is aimed to provide continuous production of ultra-fine/nano grains metals with improved strain homogeneity. The CBS process analytical model and its working principle are presented, a constitutive relation of feed length, bend roller diameter, effective strain and tensile strength is established. Results show that the magnitude and homogeneity of induced effective strain and tensile strength increase with the decrease of both feed length and bending roller diameter. Effective strain increased by 200% from 6mm to 2mm feed lengths. At 2mm feed length, tensile stress increased from 1223.8 MPa at 1 pass to 1302.5 MPa at 4 pass. Results from this study promise that CBS technique is potential to be adapted for continuous SPD of bulky length metal sheets with enhanced homogeneous properties.
- Full Text:
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