Materialkrav för komponenter i förbränningsmotorer för vätgas

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dc.contributor.authorAbda, Deler
dc.contributor.authorAndersson, Joel
dc.contributor.authorAndersson, Svante
dc.contributor.authorKåhre, Hugo
dc.contributor.authorJönsson, Henrik
dc.contributor.authorTorslén, Melker
dc.contributor.departmentChalmers tekniska högskola / Institutionen för industri- och materialvetenskapsv
dc.contributor.departmentChalmers University of Technology / Department of Industrial and Materials Scienceen
dc.contributor.examinerNyborg, Mats
dc.contributor.supervisorNorell, Mats
dc.contributor.supervisorCao, Yu
dc.date.accessioned2023-06-14T10:55:04Z
dc.date.available2023-06-14T10:55:04Z
dc.date.issued2023
dc.date.submitted2023
dc.description.abstractBecause of the current climate crisis hydrogen gas is investigated as a fuel for internal combustion engines. Hydrogen gas has the potential to be an environmentally friendly fuel since it can be produced with renewable electricity and it does not release carbon dioxide during combustion. One problem with hydrogen is that it embrittles many metals and thus potentially limits the material selection that could be used to construct a hydrogen powered engine. The purpose of the study is to investigate how hydrogen can affect materials and components in hydrogen powered internal combustion engines. Hydrogen embrittlement can be attributed to several mechanisms, these mechanisms are more thoroughly described during this project. This generally leads to for instance reduced ductility and fatigue limit for the affected materials. Different crystal structures have different susceptibility to this effect, for instance hydrogen diffusion is higher in BCC metals and BCC metals are embrittled to a greater extent compared to FCC metals. Different types of piston engines with internal combustion was further investigated to determine what engine type is more suited to being powered by hydrogen gas. This was done in order to determine components which are more relevant to study further. Spark ignition was percieved to be advantageous since hydrogen gas requires significantly higher compression than is currently used in compression ignition egnines. The effect of hydrogen on the alloys most commonly used in conventional internal combustion engines was studied. High strength steel, in general, embrittles to a higher extent compared to, for instance, aluminium and austenitic stainless steels. However, the variation is large even between different alloys within the same alloy group. Finally, components with direct exposure to hydrogen were studied as well as their requirements and which alloys they usually consist of. Exactly how fatigue limit and service life for different components would be affected could not be determined. Investigating this would require experiments with hydrogen powered engines for long periods of time. A conclusion is that components in proximity to the combustion chamber are critical to study further, partially because of the high concentrations of hydrogen and partially because of the high mechanical and thermal stresses.
dc.identifier.coursecodeIMSX16
dc.identifier.urihttp://hdl.handle.net/20.500.12380/306211
dc.language.isoswe
dc.setspec.uppsokTechnology
dc.titleMaterialkrav för komponenter i förbränningsmotorer för vätgas
dc.type.degreeExamensarbete på kandidatnivåsv
dc.type.degreeBachelor Thesisen
dc.type.uppsokM2
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