Abstract
Cold headability is the ability of a cylindrical metallic specimen to be shaped at high strain rate into the head of a bolt, screw or other cold-formed part without cracking. This property is material dependent and can be influenced by many factors such as chemical composition, surface condition, and microstructure. The effect of microstructure upon the cold headability of a medium carbon steel (1036M) was investigated. Six different microstructures were produced by various heat treatments. Drop weight tower (DWT) testing methods, previously developed at McGill University, were used on samples of these materials. Visual inspection, metallographic and SEM analysis were carried out to detect cracks on the surfaces of tested samples and to identify their causes. The axial and circumferential strains of the tested samples were measured and the strains at which cracks were initiated were used to assess the headability. The cold headability was found to be particularly sensitive to the microstructure and was greatest in the completely spheroidized structures. This indicates that DWT testing is a valid method for evaluating the cold headability of metallic materials.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 905-913 |
| Number of pages | 9 |
| Journal | ISIJ International |
| Volume | 44 |
| Issue number | 5 |
| DOIs | |
| State | Published - Jan 1 2004 |
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All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry
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Effect of microstructure on the cold headability of a medium carbon steel. / Ma, Xiaoyu; Humphreys, Alan O.; Nemes, James; Hone, Michel; Nickoletopoulos, Nick; Jonas, John J.
In: ISIJ International, Vol. 44, No. 5, 01.01.2004, p. 905-913.Research output: Contribution to journal › Article
TY - JOUR
T1 - Effect of microstructure on the cold headability of a medium carbon steel
AU - Ma, Xiaoyu
AU - Humphreys, Alan O.
AU - Nemes, James
AU - Hone, Michel
AU - Nickoletopoulos, Nick
AU - Jonas, John J.
PY - 2004/1/1
Y1 - 2004/1/1
N2 - Cold headability is the ability of a cylindrical metallic specimen to be shaped at high strain rate into the head of a bolt, screw or other cold-formed part without cracking. This property is material dependent and can be influenced by many factors such as chemical composition, surface condition, and microstructure. The effect of microstructure upon the cold headability of a medium carbon steel (1036M) was investigated. Six different microstructures were produced by various heat treatments. Drop weight tower (DWT) testing methods, previously developed at McGill University, were used on samples of these materials. Visual inspection, metallographic and SEM analysis were carried out to detect cracks on the surfaces of tested samples and to identify their causes. The axial and circumferential strains of the tested samples were measured and the strains at which cracks were initiated were used to assess the headability. The cold headability was found to be particularly sensitive to the microstructure and was greatest in the completely spheroidized structures. This indicates that DWT testing is a valid method for evaluating the cold headability of metallic materials.
AB - Cold headability is the ability of a cylindrical metallic specimen to be shaped at high strain rate into the head of a bolt, screw or other cold-formed part without cracking. This property is material dependent and can be influenced by many factors such as chemical composition, surface condition, and microstructure. The effect of microstructure upon the cold headability of a medium carbon steel (1036M) was investigated. Six different microstructures were produced by various heat treatments. Drop weight tower (DWT) testing methods, previously developed at McGill University, were used on samples of these materials. Visual inspection, metallographic and SEM analysis were carried out to detect cracks on the surfaces of tested samples and to identify their causes. The axial and circumferential strains of the tested samples were measured and the strains at which cracks were initiated were used to assess the headability. The cold headability was found to be particularly sensitive to the microstructure and was greatest in the completely spheroidized structures. This indicates that DWT testing is a valid method for evaluating the cold headability of metallic materials.
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U2 - 10.2355/isijinternational.44.905
DO - 10.2355/isijinternational.44.905
M3 - Article
VL - 44
SP - 905
EP - 913
JO - ISIJ International
JF - ISIJ International
SN - 0915-1559
IS - 5
ER -