An explanation of the relationship of fracture toughness to temperature in the range from upper shelf to first phase transformation

1992 ◽  
Vol 43 (2) ◽  
pp. 305-311 ◽  
Author(s):  
Yu-De Li
Keyword(s):  
Fracture Toughness ◽  
Phase Transformation ◽  
Relationship Of ◽  
The Relationship

Effect of Sintering Temperature on Microstructure and Properties of VС/Fe Composite

2012 ◽  
Vol 430-432 ◽  
pp. 978-983
Author(s):  
Guo Jun Zhang ◽  
Zhi Ping Sun ◽  
Li Yan Zou
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Sintering Temperature ◽  
Growth Trend ◽  
Flexure Strength ◽  
Microstructure And Properties ◽  
Whole Process ◽  
Relationship Of ◽  
The Relationship ◽  
Composite Samples

VC/Fe composite samples were fabricated by sintering at 1050, 1100 and 1150°C in vacuum. The microstructure and mechanical properties of samples were examined, and the relationship of structure and mechanical properties for VC/Fe composite sintered at different temperature were studied. The results show that fracture toughness, hardness and density is increasing obviously at 1050-1100°Cwith the increasing sintering temperature, but the growth trend increases slowly at 1100-1150°C; in whole process with temperature increased, Flexure strength heighten trend obviously. The microstructure of VC/Fe composite changed from particles piled up together to the microstructure particles closely, VC particles set gradually into Fe with temperature increased, and the gap reduced gradually.

Fracture Toughness Analysis of the China RPV Steel with Miniaturized Specimen

2016 ◽  
Vol 850 ◽  
pp. 41-46 ◽  
Author(s):  
Yun Lin ◽  
Wen Yang ◽  
Zhen Feng Tong ◽  
Guang Sheng Ning
Keyword(s):  
Fracture Toughness ◽  
Nuclear Power ◽  
Master Curve ◽  
Initiation Site ◽  
Cleavage Crack ◽  
Test Technique ◽  
Rpv Steel ◽  
Specimen Test ◽  
Relationship Of ◽  
The Relationship

Reactor pressurized vessel (RPV), which determines the lifetime of the nuclear power plant (NPP), is mainly forged using A508-3 steel in China. In order to meet the requirement of the small specimen test technique in the nuclear application, the fracture toughness of A508-3 steel was tested under-100°C using 1/4 CT specimens, and analyzed using Master Curve according to ASTM E 1921. In this work, the relationship of the KIC and the distance between the cleavage crack initiation site and the front of the fatigue crack is studied, and the transition temperature T0 of A508-3 is-98.7 oC, which is quite close to the test temperature.

Effect of Holding Time on Microstructure and Properties of VC/Fe Composite

2012 ◽  
Vol 723 ◽  
pp. 353-357
Author(s):  
Guo Jun Zhang ◽  
Zhi Ping Sun ◽  
Li Yan Zou
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Relative Density ◽  
Bending Strength ◽  
Holding Time ◽  
Microstructure And Properties ◽  
Microstructure And Mechanical Properties ◽  
Relationship Of ◽  
The Relationship ◽  
Better Than

The microstructure and mechanical properties of samples were examined, and the relationship of structure and mechanical properties for VC/Fe composite sintered at different holding time were studied. Holding time can influence the mechanical properties, with the holding time rising, when the holding time is 80 min, the hardness is Max, it’s 10.71 GPa, the enhancing range is 37.66%; The relative density changes slower from 60 to 100 min; when the holding time is 60 minutes, fracture toughness and bending strength of material is 16.17 MPa•m 1/2 and 1070 MPa, it’s better than before.

Bridging Toughening Mechanism of Fiber Eutectics and Transformation Particles Composite Ceramic

2010 ◽  
Vol 177 ◽  
pp. 178-181 ◽  
Author(s):  
Xin Hua Ni ◽  
Xie Quan Liu ◽  
Bao Hong Han ◽  
Guo Hui Zhong ◽  
Tao Sun
Keyword(s):  
Fracture Toughness ◽  
Volume Fraction ◽  
Composite Ceramic ◽  
Diameter Ratio ◽  
Interface Bonding ◽  
Toughening Mechanism ◽  
Random Orientation ◽  
Relationship Of ◽  
Interface Bonding Strength ◽  
The Relationship

Based on the microstructure of fiber eutectics and transformation particles composite ceramic, the bridging stress of the fiber eutectic is determined. The bridging load that makes crack closure to reduce the stress concentration of crack tip is calculated. The energy dissipative value of the bridging load is obtained by considering the random orientation of the fiber eutectic. Finally, according to the relationship of the fracture toughness and energy dissipation, the bridging toughening mechanism is established. Analysis shows that the bridging toughening value is enhanced with the increasing of volume fraction and fracture strength of fiber eutectic, and enhanced with the decreasing of interface bonding strength and length-diameter ratio.

Inner Connection of Bainite and Pearlite Transformation in Steels

2014 ◽  
Vol 900 ◽  
pp. 64-67
Author(s):  
Jian Hao Chen ◽  
Xiao Ling· Zhou ◽  
Lan Meng ◽  
Wen Liu
Keyword(s):  
Magnetic Field ◽  
Phase Transformation ◽  
Driving Force ◽  
Spontaneous Magnetization ◽  
Martensite Phase ◽  
Bainite Transformation ◽  
Relationship Of ◽  
The Relationship ◽  
New Phase ◽  
Magnetic Drive

Decomposition of austenite in steels from high to low temperatures is pearlite, bainite and martensite phase transformation. According to studies, magnetic field promotes the three transformations. The phenomenons indicate the three transformations have coherence in magnetics. There is a transformation from paramagnetism (γ) to ferromagnetism (α) among all these three. Magnetic drive ΔGm plays an important role in the phase transition. The bainite transformation was carried out at 300°C during different isothermal time. Combining the results, it studied the relationship of bainite and pearlite transformation from characteristics of the nucleation of BF, microstructures etc. Even without magnetic field, spontaneous magnetization makes contributions to phase transformation driving force. Small deflections cause by spontaneous magnetization may promote the lattice reorganization from FCC to BCC in a certain extent, while promote the formation of the new phase with BCC cube.

The Relationship of the Resistance Curve and Gc to Specimen Configuration

1977 ◽  
Vol 28 (1) ◽  
pp. 28-38 ◽  
Author(s):  
N J I Adams ◽  
H G Munro
Keyword(s):  
Fracture Toughness ◽  
Plastic Zone ◽  
Aluminium Alloys ◽  
Crack Extension ◽  
Thin Sheet ◽  
Compact Tension ◽  
Resistance Curve ◽  
Resistance Curves ◽  
Relationship Of ◽  
The Relationship

SummaryFollowing a brief introduction, an examination is presented of the factors which define fracture toughness, resistance-curve relationships and the extent of stable crack extension in thin-sheet failure. Tests have been performed on three aluminium alloys to establish the variations in the shape of resistance curves, using both compliance-indicated and measured absolute values of crack length in compact tension specimens and centre crack sheets. The results show that both the toughness and the resistance curves of the two specimen types are different and that these differences cannot be explained wholly by consideration of crack tip plastic zone sizes.

The Relationship of Radiation Embrittlement and Swelling for Austenitic Steels for WWER Internals

2009 ◽  
Author(s):  
B. Z. Margolin ◽  
I. P. Kursevich ◽  
A. A. Sorokin ◽  
V. S. Neustroev
Keyword(s):  
Phase Transformation ◽  
Austenitic Steel ◽  
Sharp Decrease ◽  
Austenitic Steels ◽  
Radiation Swelling ◽  
Temperature Dependences ◽  
Temperature Ranges ◽  
Radiation Conditions ◽  
Relationship Of ◽  
The Relationship

To investigate the effect of swelling upon mechanical properties of irradiated austenitic steel the investigations were conducted with steel 18Cr-10Ni-Ti and its weld irradiated up to same damage doses in two different temperature ranges: at the irradiation temperature of 330÷340°C when swelling is practically absent and at 400÷450°C when a considerable swelling level of 3÷13% is observed. Basing on the investigation results the temperature dependences of tensile properties of irradiated metal were constructed and analyzed. Fracture surfaces for ruptured specimens were examined by SEM. Comparative investigations of magnetization of irradiated metal at different irradiation temperatures were performed. It was concluded from the performed analysis of the results that in highly irradiated austenitic steel with considerable swelling a ductile to brittle transition is observed, which is caused of the Feγ→Feα phase transformation. The investigations of magnetization of metals with different swelling, as well as on the available literature data confirm a possibility of the Feγ→Feα phase transformation under considerable radiation swelling. The criterion is proposed allowing one to determine the radiation conditions under which the Feγ→Feα transformation make it possible a brittle fracture. The mechanism resulting in a sharp decrease of the ultimate tensile strength of highly irradiated metal is considered.

Effect of Ti(C,N) Content on Microstructure and Mechanical Properties of Ti(C,N)/Fe Composites

2012 ◽  
Vol 583 ◽  
pp. 215-218
Author(s):  
Rui Feng Wang ◽  
Zhi Ping Sun ◽  
Li Yan Zou ◽  
Guo Jun Zhang
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Vickers Hardness ◽  
N Content ◽  
Wear Resistant ◽  
Microstructure And Mechanical Properties ◽  
Relationship Of ◽  
The Relationship

Ti(C,N)/Fe composites samples were fabricated in vacuum and Ti(C,N) content was respectively 20vol.%, 30vol.% and 40vol.%. The relationship of microstructure and mechanical properties for Ti(C,N)/Fe composites with various Ti(C,N) content were studied. The results indicated that the flexural strength and wear resistant increased with increasing the content of Ti(C,N)in the range of 0 to 30vol.%, then decreased with further increase of Ti(C,N) content, and the fracture toughness decreases with increasing Ti(C,N) content integrally, while the Vickers hardness increased with the increase of Ti(C,N) content. The microstructure of Ti(C,N)/Fe composites is uniform, fine grains, and grains combine more closely with Ti(C,N) 30vol.%. By comparing the properties of the material was relatively good with Ti(C,N) 30vol.% at 1300°C.

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