Fatigue behavior studies of die-pressing tool steel

Low cycle fatigue (LCF) behaviour of a tool steel YXMI under quenching and tempered conditions is reported, the alloy was quenching at 1220°C for 18min and then tempering at 540°C for lh, three tempering cycles, which resulted in tempered martensite, precipitate carbide and untempered martensite str...

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Main Author: Zhang, Shao Dong
Other Authors: Yip, Tick Hon
Format: Theses and Dissertations
Published: 2008
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Online Access:http://hdl.handle.net/10356/5535
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-55352023-03-11T17:27:47Z Fatigue behavior studies of die-pressing tool steel Zhang, Shao Dong Yip, Tick Hon School of Mechanical and Production Engineering DRNTU::Engineering::Manufacturing Low cycle fatigue (LCF) behaviour of a tool steel YXMI under quenching and tempered conditions is reported, the alloy was quenching at 1220°C for 18min and then tempering at 540°C for lh, three tempering cycles, which resulted in tempered martensite, precipitate carbide and untempered martensite structure, total axial strain controlled LCF tests were conducted at strain rate varies from 0.008 to 0.0144 s"1 at total strain amplitude ranges from 1% to 2%, in the room temperature. The cycles stress response behaviour, The material shows evidence of very high cyclic softening, varying between 30 MPa and 200 MPa depending on strain amplitude, this softening can reach up to 30% of the first cycle amplitude. Such behaviour is commonly explained as follows: the initial high dislocation density that results from the quenching, decreases during cycling and generates dislocation cell structures and the tool steel shows cyclic softenting. Master of Science (Mechanics & Processing of Materials) 2008-09-17T10:52:55Z 2008-09-17T10:52:55Z 2003 2003 Thesis http://hdl.handle.net/10356/5535 Nanyang Technological University application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
topic DRNTU::Engineering::Manufacturing
spellingShingle DRNTU::Engineering::Manufacturing
Zhang, Shao Dong
Fatigue behavior studies of die-pressing tool steel
description Low cycle fatigue (LCF) behaviour of a tool steel YXMI under quenching and tempered conditions is reported, the alloy was quenching at 1220°C for 18min and then tempering at 540°C for lh, three tempering cycles, which resulted in tempered martensite, precipitate carbide and untempered martensite structure, total axial strain controlled LCF tests were conducted at strain rate varies from 0.008 to 0.0144 s"1 at total strain amplitude ranges from 1% to 2%, in the room temperature. The cycles stress response behaviour, The material shows evidence of very high cyclic softening, varying between 30 MPa and 200 MPa depending on strain amplitude, this softening can reach up to 30% of the first cycle amplitude. Such behaviour is commonly explained as follows: the initial high dislocation density that results from the quenching, decreases during cycling and generates dislocation cell structures and the tool steel shows cyclic softenting.
author2 Yip, Tick Hon
author_facet Yip, Tick Hon
Zhang, Shao Dong
format Theses and Dissertations
author Zhang, Shao Dong
author_sort Zhang, Shao Dong
title Fatigue behavior studies of die-pressing tool steel
title_short Fatigue behavior studies of die-pressing tool steel
title_full Fatigue behavior studies of die-pressing tool steel
title_fullStr Fatigue behavior studies of die-pressing tool steel
title_full_unstemmed Fatigue behavior studies of die-pressing tool steel
title_sort fatigue behavior studies of die-pressing tool steel
publishDate 2008
url http://hdl.handle.net/10356/5535
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