scholarly journals Effect of Microstructure in Hot Rolled Steel on the Formation of Retained Austenite and Mechanical Properties in Cold Rolled and Annealed Steel Sheet

1989 ◽  
Vol 75 (4) ◽  
pp. 626-633 ◽  
Author(s):  
Hung Chuan CHEN ◽  
Kenji TOMOKIYO ◽  
Hidenori ERA ◽  
Mineo SHIMIZU
Keyword(s):  
Mechanical Properties ◽  
Retained Austenite ◽  
Steel Sheet ◽  
Rolled Steel ◽  
Cold Rolled ◽  
Annealed Steel ◽  
Hot Rolled ◽  
Hot Rolled Steel ◽  
Effect Of Microstructure

Effects of Pre-Strain and Aging Treatment on the Mechanical Properties of 1.0wt.%Cu Containing Hot Rolled Steel Sheet

2004 ◽  
Vol 449-452 ◽  
pp. 517-520 ◽  
Author(s):  
In Gon Kim ◽  
Yang Do Kim ◽  
In Bae Kim
Keyword(s):  
Mechanical Properties ◽  
Steel Sheet ◽  
Aging Treatment ◽  
Spherical Shape ◽  
Peak Hardness ◽  
Precipitation Reaction ◽  
Strength Increase ◽  
Rolled Steel ◽  
Hot Rolled ◽  
Hot Rolled Steel

The effects of pre-strain and aging treatment on the mechanical properties of hot rolled steel sheet containing 1.0wt.%Cu were investigated. As the amount of pre-strain increased, the maximum hardness increased and the time to reach its peak hardness decreased. Tensile strength of 10% pre-strained steel was 600MPa. This value was about 150MPa higher than that of hot rolled steel. In case of 30% pre-strained steel, the strength was further increased to 657MPa. Such a strength increase was due to the strain hardening and enhanced precipitation reaction of Cu-clusters. TEM study revealed that fine Cu-clusters were uniformly dispersed throughout the grain. This means that the precipitation of Cu-clusters was mainly controlled by the vacancies introduced during the pre-straining process. The size of Cu-clusters was about 10~20nm at peak aged condition and they had spherical shape.

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