Effect of Prestrain at Elevated Temperature on the Fracture Behavior of High Strength Steels

1983 ◽  
Vol 105 (1) ◽  
pp. 16-20 ◽  
Author(s):  
K. Satoh ◽  
M. Toyoda ◽  
Y. Mutoh
Keyword(s):  
Elevated Temperature ◽  
Cleavage Fracture ◽  
Fracture Mechanism ◽  
Strain Aging ◽  
Fracture Behavior ◽  
Present Report ◽  
High Strength Steels ◽  
High Strength ◽  
Fracture Initiation ◽  
Initiation And Propagation

It is well known that fracture initiation behavior is influenced by weld thermal straining. In the present report, attention is focused on the influence of weld thermal straining on the fracture mechanism. The influence of prestrain at elevated temperature or strain-aging on the initiation and propagation behaviors of ductile and cleavage fracture in KD32 and HT80 steels is investigated. A relationship between the increase in the lowest temperature at which a tear dimple region can be observed (Ti) or the decrease in stretched zone width and the increase in hardness at the notch tip is found.

Interrelation between Local and Global Characteristics of Cleavage Fracture

2013 ◽  
Vol 592-593 ◽  
pp. 221-224
Author(s):  
Vladimir Grishchenko ◽  
Sergiy Kotrechko ◽  
Sergey Mamedov ◽  
Oleksandra Zatsarna ◽  
Ivo Dlouhý
Keyword(s):  
Cleavage Fracture ◽  
High Strength Steels ◽  
High Strength ◽  
Fracture Initiation ◽  
Calibration Procedure ◽  
Local Approach ◽  
Notched Specimens ◽  
Distribution Parameters ◽  
Reactor Pressure

The complexity of calibration procedure for determination of Weibull distribution parameters as well as necessity to perform FEM calculations is one of the shortcomings of conventional versions of Local Approach (LA). This report presents an attempt to ascertain interrelation between local and global characteristics of fracture of pre-cracked and notched specimens of reactor pressure vessel steels, high-strength steels etc. Criterion of cleavage fracture initiation ahead of a crack (notch) is formulated. Dimensionless parameter characterizing the effect of embrittlement by the crack or notch is proposed on the basis of this criterion. Based on the findings of low-temperature tests of pre-cracked or notched specimens of structural steels, it is proved that this parameter may be determined by both local and global characteristics.

Analysis of fracture behavior of high-strength steels in tension after fire exposure

2021 ◽  
Vol 231 ◽  
pp. 111750
Author(s):  
Wen-Yu Cai ◽  
Jian Jiang ◽  
Yan-Bo Wang ◽  
Guo-Qiang Li
Keyword(s):  
Fracture Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Fire Exposure

Prediction of Fracture in Square-Cup Forming of Aluminium Alloy

2007 ◽  
Vol 546-549 ◽  
pp. 703-706
Author(s):  
Zhong Qi Yu ◽  
Zhong Qin Lin ◽  
Yu Ying Yang
Keyword(s):  
Aluminium Alloy ◽  
Fracture Behavior ◽  
Fracture Criterion ◽  
High Strength ◽  
Fracture Initiation ◽  
Alloy Sheet ◽  
Aluminum Alloy Sheet ◽  
Ductile Fracture Criterion ◽  
Vehicle Mass ◽  
Experimental Values

Aluminum alloy sheet is becoming one of the main materials to take the place of steel components to reduce the vehicle mass due to the advantage of low special density, high strength and corrosion resistance. To predict the formability during the aluminium alloy sheet forming accurately, , a ductile fracture criterion developed by the authors, was for numerical simulation, in this paper. Fracture behavior in square-cup forming of the aluminium alloy LF21M was predicted by means of the criterion. Comparison of the predicted results with experimental values shows that the critical punch stroke and the fracture initiation position in square-cup forming of the aluminium alloy have been predicted successfully by the criterion.

Elevated Temperature Properties of Maraging Steel Plates and Welds

1971 ◽  
Vol 93 (2) ◽  
pp. 218-224
Author(s):  
N. Kenyon ◽  
E. P. Sadowski ◽  
P. P. Hydrean
Keyword(s):  
Elevated Temperature ◽  
Maraging Steel ◽  
Elevated Temperatures ◽  
High Strength Steels ◽  
High Strength ◽  
Steel Plates ◽  
Maraging Steels ◽  
Gas Tungsten Arc ◽  
Temperature Exposure ◽  
Rupture Behavior

The creep rupture behavior, and the effects of elevated temperature exposure in air and hydrogen on the subsequent room temperature properties of a 12 percent Ni-5 percent Cr-3 percent Mo maraging steel are described. Tests have been made on several heats of plate and on gas tungsten-arc, gas metal-arc, and electroslag welds. On the basis of the results obtained, maraging steels offer promise as high-strength steels for service at elevated temperatures.

Strain aging of high-strength steels

1969 ◽  
Vol 11 (10) ◽  
pp. 792-797
Author(s):  
N. G. Orekhov ◽  
L. M. Pevzner ◽  
A. S. Tarantova ◽  
S. T. Kishkin
Keyword(s):  
Strain Aging ◽  
High Strength Steels ◽  
High Strength

Study on Micro-Mechanism of Crack Initiation and Propagation Induced by Inclusion in Ultra-High Strength Steel

2007 ◽  
Vol 353-358 ◽  
pp. 1185-1190 ◽  
Author(s):  
Yan Ping Zeng ◽  
Hong Mei Fan ◽  
Xi Shu Wang ◽  
Xi Shan Xie
Keyword(s):  
Crack Initiation ◽  
High Strength Steel ◽  
Harmful Effect ◽  
High Strength Steels ◽  
High Strength ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Crack Initiation And Propagation ◽  
Initiation And Propagation ◽  
Ultra High Strength Steel

Specially designed SEM in-situ tensile and fatigue tests have been conducted to trace the entire process of crack initiation and propagation till fracture in an ultra-high strength steel MA250. TiN is a typical inclusion and its average size is in the range of 8~10μm in MA250 steel. The micro-mechanism of the effect of TiN inclusion on crack initiation and propagation at tensile and fatigue tests both have been studied in detail. Experimental results show the harmful effect of TiN on tensile and fatigue properties both. This work is helpful to establish the practical life prediction model for the characteristic inclusion parameters in ultra-high strength steel components. It also enlightens us to eliminate TiN in the further development of ultra-high strength steels.

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