Microstructural and texture evolution of Jethete M152 flanged-test pieces during cold rotary forging

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Abstract

Rotary forging is an attractive incremental metal forming with many advantages over any other processes, requiring smaller deformation force and providing high accuracy (near-net-process). The main applications of rotary forging process include families of bevel and helical gears, and flanged components for transmissions such as disk, rollers, wheels, etc. The main aim of this work is to study the impact of rotary forging process on the microstructural and texture evolution of high-strength materials, and martensitic stainless steels in particular, during cold rotary forging process. Jethete M152 alloy is a cold formable 13%-Cr martensitic stainless steel used in the aerospace industry. Jethete M152 flanged test-pieces were rotary forged at room temperature. The process was interrupted at 4 intermediate steps, providing flange reductions of 25, 30, 50, 65 and 70 %. A complex grain flow and inhomogeneous deformation patterns are developed during rotary forging, characterized mainly by the formation of a strong deformation band which run parallel to the bottom die. A transition from asymmetrical bulging (inverted mushroom) to symmetrical bulging was observed as a result of the initial lower contact area of the preform with the bottom die. From microstructural analysis by EBSD, the lath structure of Jethete M152 is gradually reoriented and changes it shape in a direction parallel to the compression plane, developing a lamellar/pancake structure in those positions with maximum deformation. These microstructural changes are accompanied with the development of a strong texture formed by a duplex <100> + <111> fibers aligned with the compression axis, being the <111> fiber the stronger one. These findings are in good agreement with uniaxial compression for bcc metals. The analysis of the Orientation Distribution Figures (ODF) reveals that 4 main texture components are formed in the course of the rotary forging process: Brass {110}〈112〉, L {110}〈110〉, I {112}〈110〉, and Cube {001}〈100〉. In contrast with reported literature for bcc metals, no texture component associated to the γ-fiber ({111} ‖ ND) was found.
LanguageEnglish
Pages582-594
Number of pages13
JournalJournal of Materials Processing Technology
Volume252
Early online date9 Oct 2017
DOIs
Publication statusPublished - 28 Feb 2018

Fingerprint

Forging
Texture
Textures
Martensitic stainless steel
Stainless Steel
Fiber
Fibers
Metals
Die
Helical gears
Compression
Bevel gears
Lamellar structures
Aerospace industry
Metal forming
Metal Forming
Brass
Flanges
Wheels
Wheel

Keywords

  • rotary forging
  • near-net-shape
  • texture evolution
  • martensitic stainless steels
  • cold forming

Cite this

@article{58aaeb676fd94824a389795726bcb4db,
title = "Microstructural and texture evolution of Jethete M152 flanged-test pieces during cold rotary forging",
abstract = "Rotary forging is an attractive incremental metal forming with many advantages over any other processes, requiring smaller deformation force and providing high accuracy (near-net-process). The main applications of rotary forging process include families of bevel and helical gears, and flanged components for transmissions such as disk, rollers, wheels, etc. The main aim of this work is to study the impact of rotary forging process on the microstructural and texture evolution of high-strength materials, and martensitic stainless steels in particular, during cold rotary forging process. Jethete M152 alloy is a cold formable 13{\%}-Cr martensitic stainless steel used in the aerospace industry. Jethete M152 flanged test-pieces were rotary forged at room temperature. The process was interrupted at 4 intermediate steps, providing flange reductions of 25, 30, 50, 65 and 70 {\%}. A complex grain flow and inhomogeneous deformation patterns are developed during rotary forging, characterized mainly by the formation of a strong deformation band which run parallel to the bottom die. A transition from asymmetrical bulging (inverted mushroom) to symmetrical bulging was observed as a result of the initial lower contact area of the preform with the bottom die. From microstructural analysis by EBSD, the lath structure of Jethete M152 is gradually reoriented and changes it shape in a direction parallel to the compression plane, developing a lamellar/pancake structure in those positions with maximum deformation. These microstructural changes are accompanied with the development of a strong texture formed by a duplex <100> + <111> fibers aligned with the compression axis, being the <111> fiber the stronger one. These findings are in good agreement with uniaxial compression for bcc metals. The analysis of the Orientation Distribution Figures (ODF) reveals that 4 main texture components are formed in the course of the rotary forging process: Brass {110}〈112〉, L {110}〈110〉, I {112}〈110〉, and Cube {001}〈100〉. In contrast with reported literature for bcc metals, no texture component associated to the γ-fiber ({111} ‖ ND) was found.",
keywords = "rotary forging, near-net-shape, texture evolution, martensitic stainless steels, cold forming",
author = "Marcos P{\'e}rez",
year = "2018",
month = "2",
day = "28",
doi = "10.1016/j.jmatprotec.2017.10.012",
language = "English",
volume = "252",
pages = "582--594",
journal = "Journal of Materials Processing Technology",
issn = "0924-0136",

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TY - JOUR

T1 - Microstructural and texture evolution of Jethete M152 flanged-test pieces during cold rotary forging

AU - Pérez, Marcos

PY - 2018/2/28

Y1 - 2018/2/28

N2 - Rotary forging is an attractive incremental metal forming with many advantages over any other processes, requiring smaller deformation force and providing high accuracy (near-net-process). The main applications of rotary forging process include families of bevel and helical gears, and flanged components for transmissions such as disk, rollers, wheels, etc. The main aim of this work is to study the impact of rotary forging process on the microstructural and texture evolution of high-strength materials, and martensitic stainless steels in particular, during cold rotary forging process. Jethete M152 alloy is a cold formable 13%-Cr martensitic stainless steel used in the aerospace industry. Jethete M152 flanged test-pieces were rotary forged at room temperature. The process was interrupted at 4 intermediate steps, providing flange reductions of 25, 30, 50, 65 and 70 %. A complex grain flow and inhomogeneous deformation patterns are developed during rotary forging, characterized mainly by the formation of a strong deformation band which run parallel to the bottom die. A transition from asymmetrical bulging (inverted mushroom) to symmetrical bulging was observed as a result of the initial lower contact area of the preform with the bottom die. From microstructural analysis by EBSD, the lath structure of Jethete M152 is gradually reoriented and changes it shape in a direction parallel to the compression plane, developing a lamellar/pancake structure in those positions with maximum deformation. These microstructural changes are accompanied with the development of a strong texture formed by a duplex <100> + <111> fibers aligned with the compression axis, being the <111> fiber the stronger one. These findings are in good agreement with uniaxial compression for bcc metals. The analysis of the Orientation Distribution Figures (ODF) reveals that 4 main texture components are formed in the course of the rotary forging process: Brass {110}〈112〉, L {110}〈110〉, I {112}〈110〉, and Cube {001}〈100〉. In contrast with reported literature for bcc metals, no texture component associated to the γ-fiber ({111} ‖ ND) was found.

AB - Rotary forging is an attractive incremental metal forming with many advantages over any other processes, requiring smaller deformation force and providing high accuracy (near-net-process). The main applications of rotary forging process include families of bevel and helical gears, and flanged components for transmissions such as disk, rollers, wheels, etc. The main aim of this work is to study the impact of rotary forging process on the microstructural and texture evolution of high-strength materials, and martensitic stainless steels in particular, during cold rotary forging process. Jethete M152 alloy is a cold formable 13%-Cr martensitic stainless steel used in the aerospace industry. Jethete M152 flanged test-pieces were rotary forged at room temperature. The process was interrupted at 4 intermediate steps, providing flange reductions of 25, 30, 50, 65 and 70 %. A complex grain flow and inhomogeneous deformation patterns are developed during rotary forging, characterized mainly by the formation of a strong deformation band which run parallel to the bottom die. A transition from asymmetrical bulging (inverted mushroom) to symmetrical bulging was observed as a result of the initial lower contact area of the preform with the bottom die. From microstructural analysis by EBSD, the lath structure of Jethete M152 is gradually reoriented and changes it shape in a direction parallel to the compression plane, developing a lamellar/pancake structure in those positions with maximum deformation. These microstructural changes are accompanied with the development of a strong texture formed by a duplex <100> + <111> fibers aligned with the compression axis, being the <111> fiber the stronger one. These findings are in good agreement with uniaxial compression for bcc metals. The analysis of the Orientation Distribution Figures (ODF) reveals that 4 main texture components are formed in the course of the rotary forging process: Brass {110}〈112〉, L {110}〈110〉, I {112}〈110〉, and Cube {001}〈100〉. In contrast with reported literature for bcc metals, no texture component associated to the γ-fiber ({111} ‖ ND) was found.

KW - rotary forging

KW - near-net-shape

KW - texture evolution

KW - martensitic stainless steels

KW - cold forming

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DO - 10.1016/j.jmatprotec.2017.10.012

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