Sintering and heat-treatment of injection moulded 440K-type martensitic stainless steel compacts

M. Yousaf Anwar, Shepherd Bhero, P. F. Messer, H. A. Davies

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Sintering and heat treatment of injection moulded hardenable stainless steel powder (440Ktype) compacts has been studied. The binder system, known as the Sheffield Binder System, was used, which is comprised of two polymers, a major component of water soluble polyethylene glycols (PEGs) and a minor component of very finely dispersed polymethyl methacrylate (PMMA) derived from an emulsion. Mixing of a number of different feedstocks was carried out manually. Following the identification of the optimum binder composition (20 wt. % PMMA, 80 wt. % PEGs) and solid loading (68 Vol. %), several test specimens were injection moulded for further processing. The PEGs were removed by leaching with water. The PMMA was removed by pyrolysis, prior to the sintering stage. Samples were sintered to ~ 99% of theoretical density. With careful control of the various processing parameters, including sintering temperature and time, cooling rate and heat treatment conditions, good mechanical properties including high hardness of HRC 60 were attained. In an attempt to reduce the process cycle time, the sintering ramp was modified to include solutionising and oil-quenching in a single sintering cycle. The hardened samples were tempered at temperatures from 150 to 350 °C for 2 hours. Scanning electron microscopy was used to reveal the micro-structural changes during various sintering and heat-treatment stages.

Original languageEnglish
Title of host publicationProceedings of the Euro International Powder Metallurgy Congress and Exhibition, Euro PM 2008
PublisherEuropean Powder Metallurgy Association (EPMA)
Pages215-220
Number of pages6
Volume2
ISBN (Print)9781899072033
Publication statusPublished - 2008
EventEuropean International Powder Metallurgy Congress and Exhibition, Euro PM 2008 - Mannheim, Germany
Duration: Sep 29 2008Oct 1 2008

Other

OtherEuropean International Powder Metallurgy Congress and Exhibition, Euro PM 2008
CountryGermany
CityMannheim
Period9/29/0810/1/08

Fingerprint

martensitic stainless steels
Martensitic stainless steel
sintering
heat treatment
Sintering
Heat treatment
injection
Polymethyl Methacrylate
Polymethyl methacrylates
polymethyl methacrylate
Polyethylene glycols
Binders
glycols
polyethylenes
cycles
Water
Stainless Steel
leaching
Processing
ramps

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Ceramics and Composites
  • Materials Chemistry
  • Metals and Alloys
  • Condensed Matter Physics

Cite this

Yousaf Anwar, M., Bhero, S., Messer, P. F., & Davies, H. A. (2008). Sintering and heat-treatment of injection moulded 440K-type martensitic stainless steel compacts. In Proceedings of the Euro International Powder Metallurgy Congress and Exhibition, Euro PM 2008 (Vol. 2, pp. 215-220). European Powder Metallurgy Association (EPMA).
Yousaf Anwar, M. ; Bhero, Shepherd ; Messer, P. F. ; Davies, H. A. / Sintering and heat-treatment of injection moulded 440K-type martensitic stainless steel compacts. Proceedings of the Euro International Powder Metallurgy Congress and Exhibition, Euro PM 2008. Vol. 2 European Powder Metallurgy Association (EPMA), 2008. pp. 215-220
@inproceedings{0abd83cf887f4654a3c89ac65853e61c,
title = "Sintering and heat-treatment of injection moulded 440K-type martensitic stainless steel compacts",
abstract = "Sintering and heat treatment of injection moulded hardenable stainless steel powder (440Ktype) compacts has been studied. The binder system, known as the Sheffield Binder System, was used, which is comprised of two polymers, a major component of water soluble polyethylene glycols (PEGs) and a minor component of very finely dispersed polymethyl methacrylate (PMMA) derived from an emulsion. Mixing of a number of different feedstocks was carried out manually. Following the identification of the optimum binder composition (20 wt. {\%} PMMA, 80 wt. {\%} PEGs) and solid loading (68 Vol. {\%}), several test specimens were injection moulded for further processing. The PEGs were removed by leaching with water. The PMMA was removed by pyrolysis, prior to the sintering stage. Samples were sintered to ~ 99{\%} of theoretical density. With careful control of the various processing parameters, including sintering temperature and time, cooling rate and heat treatment conditions, good mechanical properties including high hardness of HRC 60 were attained. In an attempt to reduce the process cycle time, the sintering ramp was modified to include solutionising and oil-quenching in a single sintering cycle. The hardened samples were tempered at temperatures from 150 to 350 °C for 2 hours. Scanning electron microscopy was used to reveal the micro-structural changes during various sintering and heat-treatment stages.",
author = "{Yousaf Anwar}, M. and Shepherd Bhero and Messer, {P. F.} and Davies, {H. A.}",
year = "2008",
language = "English",
isbn = "9781899072033",
volume = "2",
pages = "215--220",
booktitle = "Proceedings of the Euro International Powder Metallurgy Congress and Exhibition, Euro PM 2008",
publisher = "European Powder Metallurgy Association (EPMA)",

}

Yousaf Anwar, M, Bhero, S, Messer, PF & Davies, HA 2008, Sintering and heat-treatment of injection moulded 440K-type martensitic stainless steel compacts. in Proceedings of the Euro International Powder Metallurgy Congress and Exhibition, Euro PM 2008. vol. 2, European Powder Metallurgy Association (EPMA), pp. 215-220, European International Powder Metallurgy Congress and Exhibition, Euro PM 2008, Mannheim, Germany, 9/29/08.

Sintering and heat-treatment of injection moulded 440K-type martensitic stainless steel compacts. / Yousaf Anwar, M.; Bhero, Shepherd; Messer, P. F.; Davies, H. A.

Proceedings of the Euro International Powder Metallurgy Congress and Exhibition, Euro PM 2008. Vol. 2 European Powder Metallurgy Association (EPMA), 2008. p. 215-220.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - Sintering and heat-treatment of injection moulded 440K-type martensitic stainless steel compacts

AU - Yousaf Anwar, M.

AU - Bhero, Shepherd

AU - Messer, P. F.

AU - Davies, H. A.

PY - 2008

Y1 - 2008

N2 - Sintering and heat treatment of injection moulded hardenable stainless steel powder (440Ktype) compacts has been studied. The binder system, known as the Sheffield Binder System, was used, which is comprised of two polymers, a major component of water soluble polyethylene glycols (PEGs) and a minor component of very finely dispersed polymethyl methacrylate (PMMA) derived from an emulsion. Mixing of a number of different feedstocks was carried out manually. Following the identification of the optimum binder composition (20 wt. % PMMA, 80 wt. % PEGs) and solid loading (68 Vol. %), several test specimens were injection moulded for further processing. The PEGs were removed by leaching with water. The PMMA was removed by pyrolysis, prior to the sintering stage. Samples were sintered to ~ 99% of theoretical density. With careful control of the various processing parameters, including sintering temperature and time, cooling rate and heat treatment conditions, good mechanical properties including high hardness of HRC 60 were attained. In an attempt to reduce the process cycle time, the sintering ramp was modified to include solutionising and oil-quenching in a single sintering cycle. The hardened samples were tempered at temperatures from 150 to 350 °C for 2 hours. Scanning electron microscopy was used to reveal the micro-structural changes during various sintering and heat-treatment stages.

AB - Sintering and heat treatment of injection moulded hardenable stainless steel powder (440Ktype) compacts has been studied. The binder system, known as the Sheffield Binder System, was used, which is comprised of two polymers, a major component of water soluble polyethylene glycols (PEGs) and a minor component of very finely dispersed polymethyl methacrylate (PMMA) derived from an emulsion. Mixing of a number of different feedstocks was carried out manually. Following the identification of the optimum binder composition (20 wt. % PMMA, 80 wt. % PEGs) and solid loading (68 Vol. %), several test specimens were injection moulded for further processing. The PEGs were removed by leaching with water. The PMMA was removed by pyrolysis, prior to the sintering stage. Samples were sintered to ~ 99% of theoretical density. With careful control of the various processing parameters, including sintering temperature and time, cooling rate and heat treatment conditions, good mechanical properties including high hardness of HRC 60 were attained. In an attempt to reduce the process cycle time, the sintering ramp was modified to include solutionising and oil-quenching in a single sintering cycle. The hardened samples were tempered at temperatures from 150 to 350 °C for 2 hours. Scanning electron microscopy was used to reveal the micro-structural changes during various sintering and heat-treatment stages.

UR - http://www.scopus.com/inward/record.url?scp=84902215007&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84902215007&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84902215007

SN - 9781899072033

VL - 2

SP - 215

EP - 220

BT - Proceedings of the Euro International Powder Metallurgy Congress and Exhibition, Euro PM 2008

PB - European Powder Metallurgy Association (EPMA)

ER -

Yousaf Anwar M, Bhero S, Messer PF, Davies HA. Sintering and heat-treatment of injection moulded 440K-type martensitic stainless steel compacts. In Proceedings of the Euro International Powder Metallurgy Congress and Exhibition, Euro PM 2008. Vol. 2. European Powder Metallurgy Association (EPMA). 2008. p. 215-220