5Heat treatment and mechanical testing of AISI H11 steel

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

3 Citations (Scopus)

Abstract

Belonging to the class of chromium tool steels, AISI H11 possesses very good toughness and hardness, and is therefore suitable for hot metalforming jobs performed at very high loads. Mostly used in fabrication of helicopter rotor blades, H11 also has great potential as a die steel in hot-work forging and extrusion. This alloy steel can be heat treated to increase the service life and dimensional accuracy of the die and tooling. Main aim of the current investigation was to formulate an optimum heat treatment strategy for H11 steel, especially for hot work applications. High-speed milling and electric discharge machining were used to fabricate samples for tensile and impact testing. After various types of heat treatment (annealing, austenitizing, air cooling or oil quenching, single and double tempering), these samples were tested for hardness, toughness (impact), yield strength, tensile strength, and ductility. Microstructural analysis was also performed to analyze the effect of heat treatment on mechanical properties. As tempering temperature increases, hardness initially increases and then starts to gradually decrease; impact strength first decreases and then increases; and yield strength exhibits a fluctuating pattern of initial decline followed by an increase and another decrease. Even though H11 steel is highly suitable for both hot and cold-work, it is surprisingly not a common choice for metalworking dies and tools. Results presented here can encourage die designers and hot-work practitioners to explore the versatility of this tool steel, and to adopt appropriate heat treatment strategies for different applications.

Original languageEnglish
Title of host publicationKey Engineering Materials
PublisherTrans Tech Publications Ltd
Pages434-439
Number of pages6
Volume656-657
ISBN (Print)9783038354956
DOIs
Publication statusPublished - 2015
EventInternational Conference on Machining, Materials and Mechanical Technologies, IC3MT 2014 - Taipei City, Taiwan, Province of China
Duration: Aug 31 2014Sep 5 2014

Publication series

NameKey Engineering Materials
Volume656-657
ISSN (Print)10139826

Other

OtherInternational Conference on Machining, Materials and Mechanical Technologies, IC3MT 2014
CountryTaiwan, Province of China
CityTaipei City
Period8/31/149/5/14

Fingerprint

Mechanical testing
Steel
Heat treatment
Tool steel
Hardness
Tempering
Yield stress
Impact testing
Helicopter rotors
Electric discharge machining
Milling (machining)
Tensile testing
Alloy steel
Chromium
Impact strength
Forging
Service life
Turbomachine blades
Toughness
Extrusion

Keywords

  • H11 tool steel
  • Hardness
  • Microstructure
  • Optimum heat treatment
  • Tensile properties
  • Toughness

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Qamar, S. Z. (2015). 5Heat treatment and mechanical testing of AISI H11 steel. In Key Engineering Materials (Vol. 656-657, pp. 434-439). (Key Engineering Materials; Vol. 656-657). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/KEM.656-657.434

5Heat treatment and mechanical testing of AISI H11 steel. / Qamar, Sayyad Zahid.

Key Engineering Materials. Vol. 656-657 Trans Tech Publications Ltd, 2015. p. 434-439 (Key Engineering Materials; Vol. 656-657).

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

Qamar, SZ 2015, 5Heat treatment and mechanical testing of AISI H11 steel. in Key Engineering Materials. vol. 656-657, Key Engineering Materials, vol. 656-657, Trans Tech Publications Ltd, pp. 434-439, International Conference on Machining, Materials and Mechanical Technologies, IC3MT 2014, Taipei City, Taiwan, Province of China, 8/31/14. https://doi.org/10.4028/www.scientific.net/KEM.656-657.434
Qamar SZ. 5Heat treatment and mechanical testing of AISI H11 steel. In Key Engineering Materials. Vol. 656-657. Trans Tech Publications Ltd. 2015. p. 434-439. (Key Engineering Materials). https://doi.org/10.4028/www.scientific.net/KEM.656-657.434
Qamar, Sayyad Zahid. / 5Heat treatment and mechanical testing of AISI H11 steel. Key Engineering Materials. Vol. 656-657 Trans Tech Publications Ltd, 2015. pp. 434-439 (Key Engineering Materials).
@inproceedings{73f8149598ca4d5c9b0395efbdba6c50,
title = "5Heat treatment and mechanical testing of AISI H11 steel",
abstract = "Belonging to the class of chromium tool steels, AISI H11 possesses very good toughness and hardness, and is therefore suitable for hot metalforming jobs performed at very high loads. Mostly used in fabrication of helicopter rotor blades, H11 also has great potential as a die steel in hot-work forging and extrusion. This alloy steel can be heat treated to increase the service life and dimensional accuracy of the die and tooling. Main aim of the current investigation was to formulate an optimum heat treatment strategy for H11 steel, especially for hot work applications. High-speed milling and electric discharge machining were used to fabricate samples for tensile and impact testing. After various types of heat treatment (annealing, austenitizing, air cooling or oil quenching, single and double tempering), these samples were tested for hardness, toughness (impact), yield strength, tensile strength, and ductility. Microstructural analysis was also performed to analyze the effect of heat treatment on mechanical properties. As tempering temperature increases, hardness initially increases and then starts to gradually decrease; impact strength first decreases and then increases; and yield strength exhibits a fluctuating pattern of initial decline followed by an increase and another decrease. Even though H11 steel is highly suitable for both hot and cold-work, it is surprisingly not a common choice for metalworking dies and tools. Results presented here can encourage die designers and hot-work practitioners to explore the versatility of this tool steel, and to adopt appropriate heat treatment strategies for different applications.",
keywords = "H11 tool steel, Hardness, Microstructure, Optimum heat treatment, Tensile properties, Toughness",
author = "Qamar, {Sayyad Zahid}",
year = "2015",
doi = "10.4028/www.scientific.net/KEM.656-657.434",
language = "English",
isbn = "9783038354956",
volume = "656-657",
series = "Key Engineering Materials",
publisher = "Trans Tech Publications Ltd",
pages = "434--439",
booktitle = "Key Engineering Materials",

}

TY - GEN

T1 - 5Heat treatment and mechanical testing of AISI H11 steel

AU - Qamar, Sayyad Zahid

PY - 2015

Y1 - 2015

N2 - Belonging to the class of chromium tool steels, AISI H11 possesses very good toughness and hardness, and is therefore suitable for hot metalforming jobs performed at very high loads. Mostly used in fabrication of helicopter rotor blades, H11 also has great potential as a die steel in hot-work forging and extrusion. This alloy steel can be heat treated to increase the service life and dimensional accuracy of the die and tooling. Main aim of the current investigation was to formulate an optimum heat treatment strategy for H11 steel, especially for hot work applications. High-speed milling and electric discharge machining were used to fabricate samples for tensile and impact testing. After various types of heat treatment (annealing, austenitizing, air cooling or oil quenching, single and double tempering), these samples were tested for hardness, toughness (impact), yield strength, tensile strength, and ductility. Microstructural analysis was also performed to analyze the effect of heat treatment on mechanical properties. As tempering temperature increases, hardness initially increases and then starts to gradually decrease; impact strength first decreases and then increases; and yield strength exhibits a fluctuating pattern of initial decline followed by an increase and another decrease. Even though H11 steel is highly suitable for both hot and cold-work, it is surprisingly not a common choice for metalworking dies and tools. Results presented here can encourage die designers and hot-work practitioners to explore the versatility of this tool steel, and to adopt appropriate heat treatment strategies for different applications.

AB - Belonging to the class of chromium tool steels, AISI H11 possesses very good toughness and hardness, and is therefore suitable for hot metalforming jobs performed at very high loads. Mostly used in fabrication of helicopter rotor blades, H11 also has great potential as a die steel in hot-work forging and extrusion. This alloy steel can be heat treated to increase the service life and dimensional accuracy of the die and tooling. Main aim of the current investigation was to formulate an optimum heat treatment strategy for H11 steel, especially for hot work applications. High-speed milling and electric discharge machining were used to fabricate samples for tensile and impact testing. After various types of heat treatment (annealing, austenitizing, air cooling or oil quenching, single and double tempering), these samples were tested for hardness, toughness (impact), yield strength, tensile strength, and ductility. Microstructural analysis was also performed to analyze the effect of heat treatment on mechanical properties. As tempering temperature increases, hardness initially increases and then starts to gradually decrease; impact strength first decreases and then increases; and yield strength exhibits a fluctuating pattern of initial decline followed by an increase and another decrease. Even though H11 steel is highly suitable for both hot and cold-work, it is surprisingly not a common choice for metalworking dies and tools. Results presented here can encourage die designers and hot-work practitioners to explore the versatility of this tool steel, and to adopt appropriate heat treatment strategies for different applications.

KW - H11 tool steel

KW - Hardness

KW - Microstructure

KW - Optimum heat treatment

KW - Tensile properties

KW - Toughness

UR - http://www.scopus.com/inward/record.url?scp=84952323708&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84952323708&partnerID=8YFLogxK

U2 - 10.4028/www.scientific.net/KEM.656-657.434

DO - 10.4028/www.scientific.net/KEM.656-657.434

M3 - Conference contribution

SN - 9783038354956

VL - 656-657

T3 - Key Engineering Materials

SP - 434

EP - 439

BT - Key Engineering Materials

PB - Trans Tech Publications Ltd

ER -