Impact of various heat treatments on the microstructure evolution and mechanical properties of hot forged 18CrNiMo7-6 steel

Research output: Contribution to conferencePaper

Abstract

Carburizing is a method of enhancing the surface properties of components, primarily made from low to medium carbon steels, such as shafts, gears, bearings, etc. Carburized parts are generally quenched and tempered before being put into service; however, after quenching of carburized parts further annealing and hardening treatments can be employed before final tempering. This work analyses the impact of the two aforementioned heat treatment approaches on the development of subsequent microstructures and mechanical properties of hot forged 18CrNiMo7-6 steel. Moreover, this study aims to understand the impact of normalizing treatments prior to the two aforementioned heat treatment routes. Microstructural and mechanical tests were conducted on four as forged flat cylinder components that received a combination of the abovementioned heat treatments. In general, better microstructure refinement, in terms of prior austenite grain size (PAGS), was obtained for carburized parts that received the intermediate annealing and hardening treatments after quenching and prior to the final tempering. Additionally, further refinement of the martensitic pockets/blocks was observed for parts that did not receive a normalising treatment prior to carburisation. The studied heat treatments appear to have a negligible effect on the mechanical properties of the hot forged flat cylinder components.

Conference

ConferenceHeat Treat 2017
CountryUnited States
CityOhio
Period24/10/1726/10/17
Internet address

Fingerprint

Heat treatment
Mechanical properties
Microstructure
Steel
Tempering
Hardening
Quenching
Bearings (structural)
Annealing
Carburizing
Austenite
Carbon steel
Surface properties
Gears

Keywords

  • carburizing
  • heat treatment
  • 18CrNiMo7-6 steel

Cite this

@conference{d11d0e4429cc4e248fac1f5f475b37b7,
title = "Impact of various heat treatments on the microstructure evolution and mechanical properties of hot forged 18CrNiMo7-6 steel",
abstract = "Carburizing is a method of enhancing the surface properties of components, primarily made from low to medium carbon steels, such as shafts, gears, bearings, etc. Carburized parts are generally quenched and tempered before being put into service; however, after quenching of carburized parts further annealing and hardening treatments can be employed before final tempering. This work analyses the impact of the two aforementioned heat treatment approaches on the development of subsequent microstructures and mechanical properties of hot forged 18CrNiMo7-6 steel. Moreover, this study aims to understand the impact of normalizing treatments prior to the two aforementioned heat treatment routes. Microstructural and mechanical tests were conducted on four as forged flat cylinder components that received a combination of the abovementioned heat treatments. In general, better microstructure refinement, in terms of prior austenite grain size (PAGS), was obtained for carburized parts that received the intermediate annealing and hardening treatments after quenching and prior to the final tempering. Additionally, further refinement of the martensitic pockets/blocks was observed for parts that did not receive a normalising treatment prior to carburisation. The studied heat treatments appear to have a negligible effect on the mechanical properties of the hot forged flat cylinder components.",
keywords = "carburizing, heat treatment, 18CrNiMo7-6 steel",
author = "Paranjayee Mandal and {Al Mamun}, Abdullah and Himanshu Lalvani and {Da Silva}, Laurie and Marcos Perez and Lisa Muir",
note = "This article is made available as an electronic reprint with the permission of ASM International for the University of Strathclyde Institutional Repository. Reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this article for a fee or for commercial purposes, or modification of the content of this article is prohibited.; Heat Treat 2017 : 29th Heat Treating Society Conference and Exposition ; Conference date: 24-10-2017 Through 26-10-2017",
year = "2017",
month = "10",
day = "24",
language = "English",
pages = "48--53",
url = "http://www.asminternational.org/web/heat-treat-2017",

}

Mandal, P, Al Mamun, A, Lalvani, H, Da Silva, L, Perez, M & Muir, L 2017, 'Impact of various heat treatments on the microstructure evolution and mechanical properties of hot forged 18CrNiMo7-6 steel' Paper presented at Heat Treat 2017, Ohio, United States, 24/10/17 - 26/10/17, pp. 48-53.

Impact of various heat treatments on the microstructure evolution and mechanical properties of hot forged 18CrNiMo7-6 steel. / Mandal, Paranjayee; Al Mamun, Abdullah ; Lalvani, Himanshu; Da Silva, Laurie; Perez, Marcos; Muir, Lisa.

2017. 48-53 Paper presented at Heat Treat 2017, Ohio, United States.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Impact of various heat treatments on the microstructure evolution and mechanical properties of hot forged 18CrNiMo7-6 steel

AU - Mandal, Paranjayee

AU - Al Mamun, Abdullah

AU - Lalvani, Himanshu

AU - Da Silva, Laurie

AU - Perez, Marcos

AU - Muir, Lisa

N1 - This article is made available as an electronic reprint with the permission of ASM International for the University of Strathclyde Institutional Repository. Reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this article for a fee or for commercial purposes, or modification of the content of this article is prohibited.

PY - 2017/10/24

Y1 - 2017/10/24

N2 - Carburizing is a method of enhancing the surface properties of components, primarily made from low to medium carbon steels, such as shafts, gears, bearings, etc. Carburized parts are generally quenched and tempered before being put into service; however, after quenching of carburized parts further annealing and hardening treatments can be employed before final tempering. This work analyses the impact of the two aforementioned heat treatment approaches on the development of subsequent microstructures and mechanical properties of hot forged 18CrNiMo7-6 steel. Moreover, this study aims to understand the impact of normalizing treatments prior to the two aforementioned heat treatment routes. Microstructural and mechanical tests were conducted on four as forged flat cylinder components that received a combination of the abovementioned heat treatments. In general, better microstructure refinement, in terms of prior austenite grain size (PAGS), was obtained for carburized parts that received the intermediate annealing and hardening treatments after quenching and prior to the final tempering. Additionally, further refinement of the martensitic pockets/blocks was observed for parts that did not receive a normalising treatment prior to carburisation. The studied heat treatments appear to have a negligible effect on the mechanical properties of the hot forged flat cylinder components.

AB - Carburizing is a method of enhancing the surface properties of components, primarily made from low to medium carbon steels, such as shafts, gears, bearings, etc. Carburized parts are generally quenched and tempered before being put into service; however, after quenching of carburized parts further annealing and hardening treatments can be employed before final tempering. This work analyses the impact of the two aforementioned heat treatment approaches on the development of subsequent microstructures and mechanical properties of hot forged 18CrNiMo7-6 steel. Moreover, this study aims to understand the impact of normalizing treatments prior to the two aforementioned heat treatment routes. Microstructural and mechanical tests were conducted on four as forged flat cylinder components that received a combination of the abovementioned heat treatments. In general, better microstructure refinement, in terms of prior austenite grain size (PAGS), was obtained for carburized parts that received the intermediate annealing and hardening treatments after quenching and prior to the final tempering. Additionally, further refinement of the martensitic pockets/blocks was observed for parts that did not receive a normalising treatment prior to carburisation. The studied heat treatments appear to have a negligible effect on the mechanical properties of the hot forged flat cylinder components.

KW - carburizing

KW - heat treatment

KW - 18CrNiMo7-6 steel

M3 - Paper

SP - 48

EP - 53

ER -