scholarly journals Dislocations Gliding Study by IR Thermography in C-Mn Steels with Different Solute Atoms Content in the Gigacycle Fatigue Domain

2015 ◽  
Vol 664 ◽  
pp. 177-187 ◽  
Author(s):  
Zhi Yong Huang ◽  
Nicolas Ranc ◽  
Danièle Wagner
Keyword(s):  
Temperature Increase ◽  
Aluminum Content ◽  
Infrared Camera ◽  
Fatigue Tests ◽  
Ir Thermography ◽  
Mechanical Spectroscopy ◽  
Carbon Manganese Steels ◽  
Solute Atoms ◽  
Manganese Steels ◽  
French Standard

Tests were performed on two Carbon-Manganese steels (A42 and A48 steels, French standard) in the gigacycle fatigue domain thanks to a piezoelectric fatigue machine working at 20000Hz. During the tests, temperature recordings were achieved by an infrared camera for various stress amplitudes. The main difference between the two steels compositions was the aluminum content (0.045% for the A42 steel and 0.004% for the A48 steel), and the carbon content (0.140% for the A 42 steel and 0.198% for the A48 steel). In the A48 steel, the few aluminum content induces a higher free content of solute nitrogen in the lattice. Mechanical spectroscopy tests were performed and gave qualitative results on the solute contents repartition in the lattice. The temperature increase recorded during the fatigue tests for the two steels are different at the beginning of the tests. The differences can be explained by the different repartition of the solute atoms which induces a different dislocation gliding between the two materials. At the end of the tests, the thermal recordings are similar and attributed to the evolution of the solute atoms repartition and the dislocation structure.

Analysis of Creep Crack Initiation and Growth in Different Geometries for 316H and Carbon Manganese Steels

2009 ◽  
pp. 115-115-20 ◽  
Author(s):  
C. M. Davies ◽  
F. Mueller ◽  
K. M. Nikbin ◽  
N. P. O'Dowd ◽  
G. A. Webster
Keyword(s):  
Crack Initiation ◽  
Creep Crack ◽  
Carbon Manganese Steels ◽  
Manganese Steels

Effect of Particular Combinations of Quenching, Tempering and Carburization on Abrasive Wear of Low-Carbon Manganese Steels with Metastable Austenite

2019 ◽  
Vol 945 ◽  
pp. 574-578 ◽  
Author(s):  
L.S. Malinov ◽  
I.E. Malysheva ◽  
E.S. Klimov ◽  
V.V. Kukhar ◽  
E.Y. Balalayeva
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Residual Austenite ◽  
Abrasive Wear Resistance ◽  
Low Carbon ◽  
Metastable Austenite ◽  
Carbon Manganese Steels ◽  
The Impact ◽  
Manganese Steels ◽  
Dynamic Ratio

The effect of quenching from 900°C (20 min exposure) and different tempering in the 250-650°C (for 1 hour) interval, as well as additionally preliminary carburization for 8 hours at 930°C, followed by a similar heat treatment on abrasive and shock-abrasive wear of low-carbon manganese (10-24%Mn) steels, phase composition and mechanical properties was studied. It was confirmed that an increase in the manganese reduces the abrasive wear resistance and increases the impact-abrasive wear resistance. The expediency of carburization of low-carbon manganese steels is shown in order to obtain the residual austenite in the structure which amount and stability must be optimized in relation to specific abrasive impact characterized by the dynamic ratio with taking into account the chemical composition.

Microstructural Changes of a Creep-Damaged Nickel-Based K002 Superalloy Containing Hf Element under Different HIP Temperatures

2016 ◽  
Vol 35 (2) ◽  
pp. 153-159 ◽  
Author(s):  
Xiaomeng Wang ◽  
Yu Zhou ◽  
Jian Dong ◽  
Tianyou Wang ◽  
Zihua Zhao ◽  
...  
Keyword(s):  
Microstructural Evolution ◽  
Temperature Increase ◽  
Volume Fraction ◽  
Hot Isostatic Pressing ◽  
Nucleation And Growth ◽  
Dissolution Process ◽  
Microstructural Changes ◽  
Isostatic Pressing ◽  
Solute Atoms

AbstractEffects of hot isostatic pressing (HIP) temperature on the microstructural evolution of a nickel-based K002 superalloy containing Hf element after long-term service were investigated using three different soaking temperatures during HIP. The degraded γ′ precipitates represented coarse and irregular morphology after long-term service. These γ′ precipitates still were of coarse and irregular shape, but the size and volume fraction of γ′ precipitates were markedly reduced under HIP condition of 1,190°C/200 MPa/4 h, indicating that the γ′ precipitates were experiencing a dissolution process. Meanwhile, the concentrically oriented N-type γ′ rafting structure around the cavities was formed. With HIP temperature increase to 1,220°C and 1,250°C, the small-sized, cubic and regular γ′ precipitates were re-precipitated, and the concentrically oriented γ′ structure vanished. The unstable morphology induced by the nucleation and growth of γ matrix was found near the creep cavities, indicating that the solute atoms diffused inward the creep-induced cavities during HIP. However, at HIP temperature of 1,220°C and 1,250°C, a large number of blocky MC(2)-type carbides containing amounts of Hf elements were precipitated, demonstrating that HIP treatment at higher temperatures can result in the formation of a large number of blocky MC(2)-type carbides.

Low carbon manganese steels microalloyed with vanadium and nitrogen

1998 ◽  
Vol 69 (8) ◽  
pp. 334-342 ◽  
Author(s):  
Mamdouh Eissa ◽  
Kamal EI-Fawakhry ◽  
Mohamed Mekkawy ◽  
Abdul Hamid Hussein ◽  
Ahmed Tawfik
Keyword(s):  
Low Carbon ◽  
Carbon Manganese Steels ◽  
Manganese Steels

Low-carbon manganese steels with vanadium carbonitrides

1974 ◽  
Vol 16 (11) ◽  
pp. 908-912
Author(s):  
A. P. Gulyaev ◽  
V. N. Nikitin ◽  
Ya. M. Akhundov
Keyword(s):  
Low Carbon ◽  
Carbon Manganese Steels ◽  
Manganese Steels

Precipitation Processes in High-Manganese Steels

2013 ◽  
Vol 762 ◽  
pp. 405-410
Author(s):  
Georg Paul ◽  
Kirill Khlopkov
Keyword(s):  
Process Design ◽  
Carbon Nitride ◽  
Manganese Content ◽  
Austenitic Steels ◽  
High Manganese ◽  
Precipitation Behaviour ◽  
Carbon Manganese Steels ◽  
High Manganese Steels ◽  
Manganese Steels ◽  
Steel Design

The highly interesting properties of high manganese steels can be further improved by microalloying. The introduction of carbon-nitride precipitates improves the yield strength and the microstructural control during the production process. Due to the high manganese content in these austenitic steels significant changes in the precipitation behaviour have to be expected in comparison to conventional carbon-manganese steels. However, although crucial for steel design, this has not been systematically described before. Preliminary results showing the effect of Nb and V are presented. Namely the softening behaviour is related to the precipitation state. In summary this allows describing the precipitation-time-temperature evolution and provides the necessary background for the alloy and process design.

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