Metallic materials - Steel - Method of test for the determination of brittle crack arrest toughness, Kca

2019 ◽  
Keyword(s):  
Crack Arrest ◽  
Metallic Materials ◽  
Brittle Crack ◽  
Arrest Toughness

Simplified Evaluation of Brittle Crack Arrest Toughness in Heavy-thick Plate by Combined Small-scale Tests

2017 ◽  
Vol 27 (2) ◽  
pp. 210-215 ◽  
Author(s):  
Teppei Okawa ◽  
Hiroyuki Shirahata ◽  
Kiyotaka Nakashima ◽  
Kazuhisa Yanagita ◽  
Takehiro Inoue
Keyword(s):  
Thick Plate ◽  
Crack Arrest ◽  
Small Scale ◽  
Brittle Crack ◽  
Arrest Toughness

Study on Unstable Brittle Crack Arrest Toughness of Extremely-Low Carbon Bainitic Steel Plates

Materials ◽  
2004 ◽  
Author(s):  
Tsunehisa Handa ◽  
Takahiro Kubo ◽  
Keniti Amano ◽  
Mitsuhiro Okatsu ◽  
Kazunori Miyamoto ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Cross Section ◽  
Test Piece ◽  
Main Crack ◽  
Crack Arrest ◽  
Steel Plates ◽  
Bainitic Steel ◽  
Low Carbon ◽  
Brittle Crack ◽  
Arrest Toughness

The extremely-low carbon bainitic steel (ELCB steel) is a high strength steel with about 0.02 mass% or less carbon. In this research, unstable brittle crack arrest toughness of ELCB steel plates was investigated by temperature-gradient ESSO tests, compared with that of conventional TMCP steel plates. Both of ELCB and TMCP steel plates without pre-straining had sufficient crack-arrest toughness at 0°C. After 10% prestraining, the TMCP steel plate had not sufficient crack-arrest toughness at 0 °C . The ELCB steel plates, however, maintained high crack arrest toughness at 0°C. even after 10% pre-straining. ELCB steel were also different from TMCP steels in the correlation between transition temperature of crack arrest toughness and fracture appearance transition temperature (vTrs) obtained by Charpy impact test. When the vTrs of an ELCB steel and that of a TMCP steel were the same value, crack arrest toughness of an ELCB steel was higher than that of a TMCP steel. In the cross section of the ESSO test piece of the ELCB steels, many sub-cracks and micro-crack branching were observed. However, in the cross section of the ESSO test piece of the conventional TMCP steels, there were few subcracks and branching. Initiation of sub-cracks and branching around the main crack tip reduces the stress intensity factor of the main crack. It was considered that the above features of the ELCB steel were caused by initiation of sub-cracks and branching at the tip of the main brittle crack.

Determination of Crack Arrest Toughness at High Temperatures Using Compact Specimens

1988 ◽  
Vol 110 (2) ◽  
pp. 129-136 ◽  
Author(s):  
K. Kussmaul ◽  
R. Gillot
Keyword(s):  
High Temperatures ◽  
Impact Energy ◽  
Pressure Vessel ◽  
Crack Arrest ◽  
Test Method ◽  
Ferritic Steels ◽  
Pressure Vessel Steels ◽  
Reference Curves ◽  
Arrest Toughness

In order to determine the influence of the test temperature on the crack arrest toughness, investigations were carried out on pressure vessel steels of various strength and toughness up to the upper-shelf of the Charpy V-notch impact energy (CV-energy). The tests were conducted on the basis of the proposed ASTM test method for ferritic steels with modified wedge-loaded compact specimens. The thickness ranged from 0.75–6.69 in. (19–170 mm), the in-plane dimensions from 3.94–15.75 in. (100–400 mm). The comparison with the reference curves of the American and German guidelines showed significant discrepancies at high temperatures.

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