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Pellet forging of iron. / Sunullah Ozbek

Swansea University Author: Sunullah Ozbek

Abstract

A study has been made of a new particulate forging process in which pellets are used instead of conventional powder. The experimental procedure was first to produce iron oxide pellets prepared from a mixture of iron oxide superconcentrate powder and an organic binder. After drying, the oxide pellets...

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Published: 1984
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42479
first_indexed 2018-08-02T18:54:48Z
last_indexed 2019-10-21T16:47:54Z
id cronfa42479
recordtype RisThesis
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spelling 2018-09-03T08:59:23.5076127 v2 42479 2018-08-02 Pellet forging of iron. ddb37577f2000c101f4b66b9bb7947d0 NULL Sunullah Ozbek Sunullah Ozbek true true 2018-08-02 A study has been made of a new particulate forging process in which pellets are used instead of conventional powder. The experimental procedure was first to produce iron oxide pellets prepared from a mixture of iron oxide superconcentrate powder and an organic binder. After drying, the oxide pellets were reduced and sintered in hydrogen to produce porous sponge iron pellets. Preforms were made from these pellets and subsequently hot forged in a closed die at 1100&deg;C to produce forged discs. The discs were called 'sponge iron pellet forgings'. One of the purposes of the investigation was to determine whether the new route gave a product which had mechanical properties at least equal to the equivalent powder forged product even though it was made from a potentially cheap and relatively impure raw material. Thus, forgings were also made from pelletised iron powder and iron powder, and the results compared. Mechanical properties appear to be better or similar to that of iron powder forgings. The effects of process variables, such as pellet size, preform density, type of deformation and annealing treatment, on the final properties were studied. Among these, preform density (varying between 50-95% theoretical) and annealing treatment (1 hour at 700&deg;C in H2) had significant effects on the final properties. Microscopically the product is characterised by a fine grain size and a large number of uniformly distributed fine inclusions. The inclusions derived from residual impurities in the concentrate, most of which were originally in the magnetite lattice. The number, size and size distribution of the inclusions are determined. The inclusions impart a substantial grain-refinement strengthening to the iron matrix during annealing. E-Thesis Materials science. 31 12 1984 1984-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral Ph.D 2018-09-03T08:59:23.5076127 2018-08-02T16:24:29.4001876 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Sunullah Ozbek NULL 1 0042479-02082018162457.pdf 10801709.pdf 2018-08-02T16:24:57.7470000 Output 20651837 application/pdf E-Thesis true 2018-08-02T16:24:57.7470000 false
title Pellet forging of iron.
spellingShingle Pellet forging of iron.
Sunullah Ozbek
title_short Pellet forging of iron.
title_full Pellet forging of iron.
title_fullStr Pellet forging of iron.
title_full_unstemmed Pellet forging of iron.
title_sort Pellet forging of iron.
author_id_str_mv ddb37577f2000c101f4b66b9bb7947d0
author_id_fullname_str_mv ddb37577f2000c101f4b66b9bb7947d0_***_Sunullah Ozbek
author Sunullah Ozbek
author2 Sunullah Ozbek
format E-Thesis
publishDate 1984
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description A study has been made of a new particulate forging process in which pellets are used instead of conventional powder. The experimental procedure was first to produce iron oxide pellets prepared from a mixture of iron oxide superconcentrate powder and an organic binder. After drying, the oxide pellets were reduced and sintered in hydrogen to produce porous sponge iron pellets. Preforms were made from these pellets and subsequently hot forged in a closed die at 1100&deg;C to produce forged discs. The discs were called 'sponge iron pellet forgings'. One of the purposes of the investigation was to determine whether the new route gave a product which had mechanical properties at least equal to the equivalent powder forged product even though it was made from a potentially cheap and relatively impure raw material. Thus, forgings were also made from pelletised iron powder and iron powder, and the results compared. Mechanical properties appear to be better or similar to that of iron powder forgings. The effects of process variables, such as pellet size, preform density, type of deformation and annealing treatment, on the final properties were studied. Among these, preform density (varying between 50-95% theoretical) and annealing treatment (1 hour at 700&deg;C in H2) had significant effects on the final properties. Microscopically the product is characterised by a fine grain size and a large number of uniformly distributed fine inclusions. The inclusions derived from residual impurities in the concentrate, most of which were originally in the magnetite lattice. The number, size and size distribution of the inclusions are determined. The inclusions impart a substantial grain-refinement strengthening to the iron matrix during annealing.
published_date 1984-12-31T04:22:56Z
_version_ 1861599233952448512
score 11.100739

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