Impact of annealing treatments on the softening and work hardening behaviour of Jethete M152 alloy for subsequent cold forming processes

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Abstract

Cold forming processes present advantages to produce components with tight tolerances to the final (net) shape, eliminating significant production costs. These processes requires forming parts in a soft condition, with high ductility and formability. Jethete M152 alloy is a cold formable 13-Cr% martensitic stainless steel used in the aerospace industry. However, the inherent high strength of this material presents challenges in terms of the high loads and contact and friction stresses developed during cold forming processes. The main purpose of this work was to explore the impact of different types of annealing treatments (subcritical, full and isothermal treatments) on the softening and work hardening behavior of this alloy. Microstructural and mechanical testing analysis were conducted. The results indicate that only subcritical annealing treatments (T < Ar1) were successful by reducing the strength and hardness levels. However no significant effect on both work hardening behavior and uniform elongation was found. Due to the high hardenability of this alloy, those softening treatments which require the austenization of the material were translated into the formation of freshly (as-quenched) martensite, resulting into an increase of strength, loss in ductility properties and a significant change in the work hardening behaviour. Despite of the large differences in strength properties and work hardening behaviour across all the softening treatments analyzed, no significant microstructural differences were found. These results indicate that such differences are associated mainly to both dislocation density and the substructure developed during tempering/annealing at high temperatures.
LanguageEnglish
Pages303-312
Number of pages10
JournalMaterials Science and Engineering: A
Volume690
Early online date6 Mar 2017
DOIs
Publication statusPublished - 6 Apr 2017

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cold working
work hardening
Strain hardening
hardening
softening
Annealing
annealing
Ductility
ductility
Martensitic stainless steel
martensitic stainless steels
Mechanical testing
Aerospace industry
Tempering
Formability
aerospace industry
production costs
Martensite
tempering
Strength of materials

Keywords

  • Jethete M152 alloy
  • annealing treatments
  • softening behaviour
  • work hardening
  • temper martensite

Cite this

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title = "Impact of annealing treatments on the softening and work hardening behaviour of Jethete M152 alloy for subsequent cold forming processes",
abstract = "Cold forming processes present advantages to produce components with tight tolerances to the final (net) shape, eliminating significant production costs. These processes requires forming parts in a soft condition, with high ductility and formability. Jethete M152 alloy is a cold formable 13-Cr{\%} martensitic stainless steel used in the aerospace industry. However, the inherent high strength of this material presents challenges in terms of the high loads and contact and friction stresses developed during cold forming processes. The main purpose of this work was to explore the impact of different types of annealing treatments (subcritical, full and isothermal treatments) on the softening and work hardening behavior of this alloy. Microstructural and mechanical testing analysis were conducted. The results indicate that only subcritical annealing treatments (T < Ar1) were successful by reducing the strength and hardness levels. However no significant effect on both work hardening behavior and uniform elongation was found. Due to the high hardenability of this alloy, those softening treatments which require the austenization of the material were translated into the formation of freshly (as-quenched) martensite, resulting into an increase of strength, loss in ductility properties and a significant change in the work hardening behaviour. Despite of the large differences in strength properties and work hardening behaviour across all the softening treatments analyzed, no significant microstructural differences were found. These results indicate that such differences are associated mainly to both dislocation density and the substructure developed during tempering/annealing at high temperatures.",
keywords = "Jethete M152 alloy, annealing treatments, softening behaviour, work hardening, temper martensite",
author = "Marcos P{\'e}rez",
year = "2017",
month = "4",
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language = "English",
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pages = "303--312",
journal = "Materials Science and Engineering: A",
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T1 - Impact of annealing treatments on the softening and work hardening behaviour of Jethete M152 alloy for subsequent cold forming processes

AU - Pérez, Marcos

PY - 2017/4/6

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N2 - Cold forming processes present advantages to produce components with tight tolerances to the final (net) shape, eliminating significant production costs. These processes requires forming parts in a soft condition, with high ductility and formability. Jethete M152 alloy is a cold formable 13-Cr% martensitic stainless steel used in the aerospace industry. However, the inherent high strength of this material presents challenges in terms of the high loads and contact and friction stresses developed during cold forming processes. The main purpose of this work was to explore the impact of different types of annealing treatments (subcritical, full and isothermal treatments) on the softening and work hardening behavior of this alloy. Microstructural and mechanical testing analysis were conducted. The results indicate that only subcritical annealing treatments (T < Ar1) were successful by reducing the strength and hardness levels. However no significant effect on both work hardening behavior and uniform elongation was found. Due to the high hardenability of this alloy, those softening treatments which require the austenization of the material were translated into the formation of freshly (as-quenched) martensite, resulting into an increase of strength, loss in ductility properties and a significant change in the work hardening behaviour. Despite of the large differences in strength properties and work hardening behaviour across all the softening treatments analyzed, no significant microstructural differences were found. These results indicate that such differences are associated mainly to both dislocation density and the substructure developed during tempering/annealing at high temperatures.

AB - Cold forming processes present advantages to produce components with tight tolerances to the final (net) shape, eliminating significant production costs. These processes requires forming parts in a soft condition, with high ductility and formability. Jethete M152 alloy is a cold formable 13-Cr% martensitic stainless steel used in the aerospace industry. However, the inherent high strength of this material presents challenges in terms of the high loads and contact and friction stresses developed during cold forming processes. The main purpose of this work was to explore the impact of different types of annealing treatments (subcritical, full and isothermal treatments) on the softening and work hardening behavior of this alloy. Microstructural and mechanical testing analysis were conducted. The results indicate that only subcritical annealing treatments (T < Ar1) were successful by reducing the strength and hardness levels. However no significant effect on both work hardening behavior and uniform elongation was found. Due to the high hardenability of this alloy, those softening treatments which require the austenization of the material were translated into the formation of freshly (as-quenched) martensite, resulting into an increase of strength, loss in ductility properties and a significant change in the work hardening behaviour. Despite of the large differences in strength properties and work hardening behaviour across all the softening treatments analyzed, no significant microstructural differences were found. These results indicate that such differences are associated mainly to both dislocation density and the substructure developed during tempering/annealing at high temperatures.

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