Advanced material development : functionally graded stainless steel alloy composites
- Authors: Bayode, A.
- Date: 2018
- Subjects: Metallic composites , Metal coating , Pulsed laser deposition
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/284879 , uj:30784
- Description: D.Ing. (Mechanical Engineering) , Abstract: Laser metal deposition (LMD) is one of the additive manufacturing technologies that is used in the production of fully dense parts layer by layer. This innovative manufacturing process shows real promise in reducing component fabrication time, cost and weight. One of the major advantages of this technology is in the ability to manufacture components with multi-material properties such as Functionally Graded Materials (FGM). FGM is a class of advanced materials that combine the benefits of its component materials together as a whole, while minimizing the problems produced by material property mismatch of the constituent materials. Several studies have been conducted on FGMs processed by LMD. Most of these studies are on metal-ceramic composites, however, there is a growing need for bimetallic components with different properties along their axial or radial directions for modern engineering applications. In this study, the laser metal deposition process was evaluated as a candidate for manufacturing a compositionally graded bimetal material consisting magnetic and non-magnetic metals. The materials used were 17-4PH powder, AISI 316L powder and AISI 316 substrate. Since this study has not been done and there were no known models or strategies to follow in building this particular FGM. Trial and error experiments were first adopted in selecting the process conditions for building the FGM. The trial and error experiments, referred to as preliminary study involved the production of 17- 4PH and AISI 316L clads. This was done primarily to evaluate the solidification behaviour of the individual powders and also identify the process window that will successfully produce fully dense clads with good bonding and wettability that are structurally harmonised. Based on the findings of the preliminary studies, a set of parameters was obtained as a standard for producing the compositionally graded composite...
- Full Text:
- Authors: Bayode, A.
- Date: 2018
- Subjects: Metallic composites , Metal coating , Pulsed laser deposition
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/284879 , uj:30784
- Description: D.Ing. (Mechanical Engineering) , Abstract: Laser metal deposition (LMD) is one of the additive manufacturing technologies that is used in the production of fully dense parts layer by layer. This innovative manufacturing process shows real promise in reducing component fabrication time, cost and weight. One of the major advantages of this technology is in the ability to manufacture components with multi-material properties such as Functionally Graded Materials (FGM). FGM is a class of advanced materials that combine the benefits of its component materials together as a whole, while minimizing the problems produced by material property mismatch of the constituent materials. Several studies have been conducted on FGMs processed by LMD. Most of these studies are on metal-ceramic composites, however, there is a growing need for bimetallic components with different properties along their axial or radial directions for modern engineering applications. In this study, the laser metal deposition process was evaluated as a candidate for manufacturing a compositionally graded bimetal material consisting magnetic and non-magnetic metals. The materials used were 17-4PH powder, AISI 316L powder and AISI 316 substrate. Since this study has not been done and there were no known models or strategies to follow in building this particular FGM. Trial and error experiments were first adopted in selecting the process conditions for building the FGM. The trial and error experiments, referred to as preliminary study involved the production of 17- 4PH and AISI 316L clads. This was done primarily to evaluate the solidification behaviour of the individual powders and also identify the process window that will successfully produce fully dense clads with good bonding and wettability that are structurally harmonised. Based on the findings of the preliminary studies, a set of parameters was obtained as a standard for producing the compositionally graded composite...
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Characterization of laser metal deposited 316L stainless steel
- Bayode, A., Akinlabi, Esther Titilayo, Pityana, S.
- Authors: Bayode, A. , Akinlabi, Esther Titilayo , Pityana, S.
- Date: 2016
- Subjects: Laser metal deposition , Microhardnes , Stainless steel
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/92382 , uj:20223 , Citation: Bayode, A., Akinlabi, E.T. & Pityana, S. 2016. Characterization of laser metal deposited 316L stainless steel.
- Description: Abstract: Laser metal deposition (LMD) is an innovative manufacturing technique that uses laser to melt powders to fabricate fully dense components layer by layer. It is capable of processing different metallic powders and can also be used for consolidating different powder to produce custom alloys or functionally graded materials (FGM). The properties of laser processed materials is dependent on the final microstructure of the parts which in turn is dependent on the LMD processing parameters. This study investigates the effects of laser power on the structural integrity, microstructure and microhardness of laser deposited 316L stainless steel. The result showed that the laser power has much influence on the evolving microstructure and microhardness of the components. The average microhardness of the samples were observed to decrease as the laser power increased due to grain coarsening.
- Full Text:
- Authors: Bayode, A. , Akinlabi, Esther Titilayo , Pityana, S.
- Date: 2016
- Subjects: Laser metal deposition , Microhardnes , Stainless steel
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/92382 , uj:20223 , Citation: Bayode, A., Akinlabi, E.T. & Pityana, S. 2016. Characterization of laser metal deposited 316L stainless steel.
- Description: Abstract: Laser metal deposition (LMD) is an innovative manufacturing technique that uses laser to melt powders to fabricate fully dense components layer by layer. It is capable of processing different metallic powders and can also be used for consolidating different powder to produce custom alloys or functionally graded materials (FGM). The properties of laser processed materials is dependent on the final microstructure of the parts which in turn is dependent on the LMD processing parameters. This study investigates the effects of laser power on the structural integrity, microstructure and microhardness of laser deposited 316L stainless steel. The result showed that the laser power has much influence on the evolving microstructure and microhardness of the components. The average microhardness of the samples were observed to decrease as the laser power increased due to grain coarsening.
- Full Text:
Microstructure and microhardness of 17-4 ph stainless steel made by laser metal deposition
- Bayode, A., Akinlabi, Esther Titilayo, Pityana, S.
- Authors: Bayode, A. , Akinlabi, Esther Titilayo , Pityana, S.
- Date: 2016
- Subjects: Additive manufacturing , Laser metal deposition , Microstructure
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/214385 , uj:21275 , Citation: Bayode, A., Akinlabi, E & Pityana, S. 2016. Microstructure and microhardness of 17-4 ph stainless steel made by laser metal deposition.
- Description: Abstract: Laser metal deposition (LMD) is an additive manufacturing process. Unlike conventional manufacturing process which is subtractive, LMD produces part layer by layer from the ground up and has been used to fabricate fully dense components using a variety of metallic powders. This paper investigates the evolving properties of laser deposited 17- 4PH stainless steel. The microstructure was martensitic with a dendritic structure. The average microhardness of the samples was found to be less than their wrought counterpart.
- Full Text:
- Authors: Bayode, A. , Akinlabi, Esther Titilayo , Pityana, S.
- Date: 2016
- Subjects: Additive manufacturing , Laser metal deposition , Microstructure
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/214385 , uj:21275 , Citation: Bayode, A., Akinlabi, E & Pityana, S. 2016. Microstructure and microhardness of 17-4 ph stainless steel made by laser metal deposition.
- Description: Abstract: Laser metal deposition (LMD) is an additive manufacturing process. Unlike conventional manufacturing process which is subtractive, LMD produces part layer by layer from the ground up and has been used to fabricate fully dense components using a variety of metallic powders. This paper investigates the evolving properties of laser deposited 17- 4PH stainless steel. The microstructure was martensitic with a dendritic structure. The average microhardness of the samples was found to be less than their wrought counterpart.
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