NANOMECHANICAL TESTING OF ICCGHAZ OF ARCTIC STEEL
An ever increasing demand for energy is forcing the oil industry to push technology forward, as new oil rich fields are discovered further North. The Arctic offers a harsh, cold climate, leading to new challenges within the field of materials technology. Offshore and onshore Arctic production demand...
Main Author: | |
---|---|
Other Authors: | |
Format: | Master Thesis |
Language: | English |
Published: |
NTNU
2015
|
Subjects: | |
Online Access: | http://hdl.handle.net/11250/2350225 |
id |
ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2350225 |
---|---|
record_format |
openpolar |
spelling |
ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2350225 2023-05-15T14:51:14+02:00 NANOMECHANICAL TESTING OF ICCGHAZ OF ARCTIC STEEL Kvaal, Aksel Louis Legouy Thaulow, Christian 2015 http://hdl.handle.net/11250/2350225 eng eng NTNU ntnudaim:13295 http://hdl.handle.net/11250/2350225 167 Materialteknologi Materialutvikling og -bruk Master thesis 2015 ftntnutrondheimi 2019-09-17T06:50:57Z An ever increasing demand for energy is forcing the oil industry to push technology forward, as new oil rich fields are discovered further North. The Arctic offers a harsh, cold climate, leading to new challenges within the field of materials technology. Offshore and onshore Arctic production demand strong, and tough materials, able to withstand temperatures down to °60 ±C, in addition to extreme weather. As the temperature drops the risk for brittle material failure will increase. Understanding material deformation and governing mechanisms under such conditions can prevent material failure, while maintaining cost-efficiency. Application of nanomechanical testing methods has become increasingly important within ma- terials research. Understanding material properties at the micro- and nano-level, has attracted sig- nificant interest. Most small-scale experiments have been conducted at room temperature, as this requires a less complex set-up. However, testing of Arctic steels requires low temperature small- scale experiments to obtain material performance in its field of operation. The scope of this thesis was to modify existing cryogenic experimental equipment. Characteri- zation of regions in a weld simulated zone of a steel developed for use under Arctic conditions, was to be conducted. Additionally, establishing nanomechanical properties was desired. The approach was to machine micro-sized cantilevers and pillars, using a focused ion beam. The specimens were loaded, and compressed, at room temperature, and at approximately °80 ±C. The in-house made and modified cryogenic set-up enabled highly accurate low temperature nanomechanical testing. A nanoindenter was utilized to map the hardness at the micro-level, obtaining the variations of hardness in the microstructure. This thesis yielded interesting results regarding hardness, nanomechanical material properties and testing methods. However, pushing the equipment beyond its specifications resulted in exper- imental data requiring compensation for several unforeseen effects. The critical stress intensity factors were calculated through the J-integral for both pure iron and steel cantilevers. Pillar com- pression to obtain the microstructure yield strength, was also conducted, all contributing to the characterization of the microstructure and nanomechanical properties of the steel. Master Thesis Arctic NTNU Open Archive (Norwegian University of Science and Technology) Arctic Pillar ENVELOPE(166.217,166.217,-77.583,-77.583) |
institution |
Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
topic |
Materialteknologi Materialutvikling og -bruk |
spellingShingle |
Materialteknologi Materialutvikling og -bruk Kvaal, Aksel Louis Legouy NANOMECHANICAL TESTING OF ICCGHAZ OF ARCTIC STEEL |
topic_facet |
Materialteknologi Materialutvikling og -bruk |
description |
An ever increasing demand for energy is forcing the oil industry to push technology forward, as new oil rich fields are discovered further North. The Arctic offers a harsh, cold climate, leading to new challenges within the field of materials technology. Offshore and onshore Arctic production demand strong, and tough materials, able to withstand temperatures down to °60 ±C, in addition to extreme weather. As the temperature drops the risk for brittle material failure will increase. Understanding material deformation and governing mechanisms under such conditions can prevent material failure, while maintaining cost-efficiency. Application of nanomechanical testing methods has become increasingly important within ma- terials research. Understanding material properties at the micro- and nano-level, has attracted sig- nificant interest. Most small-scale experiments have been conducted at room temperature, as this requires a less complex set-up. However, testing of Arctic steels requires low temperature small- scale experiments to obtain material performance in its field of operation. The scope of this thesis was to modify existing cryogenic experimental equipment. Characteri- zation of regions in a weld simulated zone of a steel developed for use under Arctic conditions, was to be conducted. Additionally, establishing nanomechanical properties was desired. The approach was to machine micro-sized cantilevers and pillars, using a focused ion beam. The specimens were loaded, and compressed, at room temperature, and at approximately °80 ±C. The in-house made and modified cryogenic set-up enabled highly accurate low temperature nanomechanical testing. A nanoindenter was utilized to map the hardness at the micro-level, obtaining the variations of hardness in the microstructure. This thesis yielded interesting results regarding hardness, nanomechanical material properties and testing methods. However, pushing the equipment beyond its specifications resulted in exper- imental data requiring compensation for several unforeseen effects. The critical stress intensity factors were calculated through the J-integral for both pure iron and steel cantilevers. Pillar com- pression to obtain the microstructure yield strength, was also conducted, all contributing to the characterization of the microstructure and nanomechanical properties of the steel. |
author2 |
Thaulow, Christian |
format |
Master Thesis |
author |
Kvaal, Aksel Louis Legouy |
author_facet |
Kvaal, Aksel Louis Legouy |
author_sort |
Kvaal, Aksel Louis Legouy |
title |
NANOMECHANICAL TESTING OF ICCGHAZ OF ARCTIC STEEL |
title_short |
NANOMECHANICAL TESTING OF ICCGHAZ OF ARCTIC STEEL |
title_full |
NANOMECHANICAL TESTING OF ICCGHAZ OF ARCTIC STEEL |
title_fullStr |
NANOMECHANICAL TESTING OF ICCGHAZ OF ARCTIC STEEL |
title_full_unstemmed |
NANOMECHANICAL TESTING OF ICCGHAZ OF ARCTIC STEEL |
title_sort |
nanomechanical testing of iccghaz of arctic steel |
publisher |
NTNU |
publishDate |
2015 |
url |
http://hdl.handle.net/11250/2350225 |
long_lat |
ENVELOPE(166.217,166.217,-77.583,-77.583) |
geographic |
Arctic Pillar |
geographic_facet |
Arctic Pillar |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
167 |
op_relation |
ntnudaim:13295 http://hdl.handle.net/11250/2350225 |
_version_ |
1766322294008840192 |