Thermal Crack Propagation Behavior on Nitrided H13 Hot Work Die Steel

2007 ◽  
pp. 1191-1194
Author(s):  
Kuk Tae Youn ◽  
Young Mok Rhyim ◽  
Jong Hoon Lee ◽  
Chan Gyu Lee ◽  
Dong Bae Kim ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Thermal Crack ◽  
Die Steel ◽  
Propagation Behavior ◽  
Hot Work Die ◽  
Crack Propagation Behavior

Thermal Crack Propagation Behavior on Nitrided H13 Hot Work Die Steel

2007 ◽  
Vol 26-28 ◽  
pp. 1191-1194 ◽  
Author(s):  
Kuk Tae Youn ◽  
Young Mok Rhyim ◽  
Jong Hoon Lee ◽  
Chan Gyu Lee ◽  
Dong Bae Kim ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Thermal Fatigue ◽  
Thermal Crack ◽  
Die Steel ◽  
Thermal Fatigue Test ◽  
Propagation Behavior ◽  
Heat Treated ◽  
Nitrided Specimen ◽  
Hot Work Die ◽  
Crack Propagation Behavior

The influence of nitriding type and condition on the thermal crack propagation behavior of hot work die steel was investigated. Thermal fatigue tests were carried out using a special apparatus, which is consisted of induction heating and water spray cooling unit. The sum of crack length per unit specimen length, Lm is proposed as an index representing the susceptibility to crack propagation. The Lm values of the gas and ion nitrided specimens were lower than that of as-heat treated specimen. But in the case of maximum and average crack length of nitrided specimen was higher than those of as-heat treated specimen. The nitrogen diffusion layer still remained although the oxide scale was formed and fell off during thermal fatigue test. After 1000 cycles of the thermal fatigue test, the interior region of nitrided specimen showed lower hardness by softening. In particular, ion nitrided specimens of relatively less softening condition showed reduction both the depth and number of cracks compared with the other surface conditions.

scholarly journals Crack Propagation Behavior of a Ni-Based Single-Crystal Superalloy during In Situ SEM Tensile Test at 1000 °C

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1047
Author(s):  
Wenxiang Jiang ◽  
Xiaoyi Ren ◽  
Jinghao Zhao ◽  
Jianli Zhou ◽  
Jinyao Ma ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Tensile Test ◽  
Single Crystal ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Single Crystal Superalloy ◽  
Propagation Path ◽  
Propagation Behavior ◽  
Crack Propagation Behavior

An in situ scanning electron microscope (SEM) tensile test for Ni-based single-crystal superalloy was carried out at 1000 °C. The stress displacement was obtained, and the yield strength and tensile strength of the superalloy were 699 MPa and 826 MPa, respectively. The crack propagation process, consisting of Model I crack and crystallographic shearing crack, was determined. More interestingly, the crack propagation path and rate affected by eutectics was directly observed and counted. Results show that the coalescence of the primary crack and second microcrack at the interface of a γ/γ′ matrix and eutectics would make the crack propagation rate increase from 0.3 μm/s to 0.4 μm/s. On the other hand, crack deflection decreased the rate to 0.05 μm/s. Moreover, movement of dislocations in front of the crack was also analyzed to explain the different crack propagation behavior in the superalloy.

Crack propagation behavior of inhomogeneous laminated Ti−Nb metal−metal composite

2019 ◽  
Vol 29 (9) ◽  
pp. 1882-1888 ◽  
Author(s):  
Wen-juan CHENG ◽  
Yong LIU ◽  
Da-peng ZHAO ◽  
Bin LIU ◽  
Yan-ni TAN ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Metal Composite ◽  
Propagation Behavior ◽  
Metal Metal ◽  
Crack Propagation Behavior

Analysis of Crack Propagation Behavior in Alumina with Different Grain Sizes under Static and Cyclic Fatigue

2004 ◽  
Vol 264-268 ◽  
pp. 793-796
Author(s):  
Hassan El Attaoui ◽  
Malika Saâdaoui ◽  
Jérôme Chevalier ◽  
Gilbert Fantozzi
Keyword(s):  
Crack Propagation ◽  
Cyclic Fatigue ◽  
Grain Sizes ◽  
Propagation Behavior ◽  
Crack Propagation Behavior
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