Grain-size dependence of cleavage fracture toughness in mild steel

Nature ◽  
1978 ◽  
Vol 276 (5683) ◽  
pp. 50-51 ◽  
Author(s):  
D. A. CURRY
Keyword(s):  
Fracture Toughness ◽  
Grain Size ◽  
Mild Steel ◽  
Cleavage Fracture ◽  
Size Dependence

scholarly journals Grain Size Dependence of Fracture Toughness in an Ultrahigh Strength Maraging Steel

1983 ◽  
Vol 69 (1) ◽  
pp. 145-152 ◽  
Author(s):  
Yoshikuni KAWABE ◽  
Seiichi MUNEKI ◽  
Junji TAKAHASHI
Keyword(s):  
Fracture Toughness ◽  
Grain Size ◽  
Maraging Steel ◽  
Size Dependence ◽  
Ultrahigh Strength

scholarly journals Grain Size Dependence of the Fracture Toughness of Silicon Nitride Ceramics

1991 ◽  
Vol 99 (1148) ◽  
pp. 320-323 ◽  
Author(s):  
Takeshi KAWASHIMA ◽  
Hiromi OKAMOTO ◽  
Hideharu YAMAMOTO ◽  
Akira KITAMURA
Keyword(s):  
Fracture Toughness ◽  
Grain Size ◽  
Silicon Nitride ◽  
Size Dependence ◽  
Nitride Ceramics

Grain size dependence of hardness and fracture toughness in pure near fully-dense boron carbide ceramics

2016 ◽  
Vol 36 (7) ◽  
pp. 1829-1834 ◽  
Author(s):  
Bibi Malmal Moshtaghioun ◽  
Diego Gomez-Garcia ◽  
Arturo Dominguez-Rodriguez ◽  
Richard. I. Todd
Keyword(s):  
Fracture Toughness ◽  
Grain Size ◽  
Boron Carbide ◽  
Size Dependence ◽  
Carbide Ceramics

Determination of the Key Microstructural Parameter for the Cleavage Fracture Toughness of Reactor Pressure Vessel Steels in the Transition Region

2005 ◽  
Vol 297-300 ◽  
pp. 1672-1677
Author(s):  
Min Chul Kim ◽  
Bong Sang Lee ◽  
Won Jon Yang ◽  
Jun Hwa Hong
Keyword(s):  
Fracture Toughness ◽  
Grain Size ◽  
Transition Region ◽  
Cleavage Fracture ◽  
Crack Tip ◽  
Austenite Grain Size ◽  
Grain Sizes ◽  
Austenite Grain ◽  
Cleavage Initiation ◽  
Carbide Size

The effects of the microstructural parameters, such as the prior austenite grain size and carbide size, on the cleavage fracture toughness were investigated in the transition region of Mn-Mo-Ni bainitic low alloy steels. Cleavage fracture toughness was evaluated by the ASTM standard E 1921 Master curve method. In order to clarify the effects of each microstructure, the grain size and carbide size of the test materials were independently controlled by modifying the heat treatment process. Firstly, the grain sizes were changed from 25㎛ to 110㎛ without any significant changes in the carbide size and shape. Secondly, the average carbide sizes were changed from 0.20 ㎛ to 0.29㎛ but maintaining the initial grain sizes. As a result, the fracture toughness in the transition region did not show any significant dependency on the austenite grain size, while the carbide size showed a close relation to the fracture toughness. Fracture toughness was decreased with an increase of the average carbide size. From the microscopic observation of the fractured surface, the cleavage initiation distance (CID) from the original crack tip showed no direct relationship to the prior austenite grain sizes but a strong relationship to the carbide sizes. However, the measured cleavage fracture toughness was strongly related to the distance from the crack tip to the cleavage initiation site. From the viewpoint of the weakest link theory, the particle size and their distribution in front of the crack tip is probably more important than the grain size in the transition temperature range where the fracture was controlled by the cleavage crack initiation.

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