scholarly journals Effect of matrix carbon content and lath martensite microstructures on the tempered precipitates and impact toughness of a medium-carbon low-alloy steel

2020 ◽  
Vol 9 (4) ◽  
pp. 7701-7710
Author(s):  
Chen Sun ◽  
Pai-Xian Fu ◽  
Xiao-Ping Ma ◽  
Hang-Hang Liu ◽  
Ning-Yu Du ◽  
...  
Keyword(s):  
Impact Toughness ◽  
Carbon Content ◽  
Alloy Steel ◽  
Lath Martensite ◽  
Low Alloy Steel ◽  
Medium Carbon

Modeling of Microstructure Evolution of Athermal Transformation of Lath Martensite

2007 ◽  
Vol 539-543 ◽  
pp. 4795-4800 ◽  
Author(s):  
Don H. Sherman ◽  
Bing J. Yang ◽  
Adrian V. Catalina ◽  
Ashwin A. Hattiangadi ◽  
Patrick Zhao ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Alloy Steel ◽  
Microstructure Evolution ◽  
Lath Martensite ◽  
Heat Treatments ◽  
Dynamic Loads ◽  
Low Alloy Steel ◽  
Cooling Rates ◽  
Medium Carbon

Martensitic microstructures in steels provide the strength and toughness required for the dynamic loads experienced by construction and mining machines. Such microstructures are produced with appropriate heat treatments. A physics based model has been developed to represent the microstructure evolution during the martensitic transformation. This modeling has been used to understand the role of as-quenched microstructure on subsequent processing. This paper describes modeling the martensitic transformation in steels under different cooling rates. The model described in this paper has been validated with a medium carbon, low alloy steel.

Effect of Microstructure and Mechanical Properties on Two Body Abrasive Wear Resistance of Medium-Carbon Low-Alloy Steel

2011 ◽  
Vol 52-54 ◽  
pp. 1247-1252 ◽  
Author(s):  
Jun Miao ◽  
Li Jun Wang ◽  
Chun Ming Liu
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Impact Toughness ◽  
Abrasive Wear ◽  
Alloy Steel ◽  
Water Quenching ◽  
Low Alloy Steel ◽  
Tempering Temperature ◽  
Medium Carbon ◽  
Test Steel

The effect of microstructure and mechanical properties on abrasion resistance of the medium-carbon low-alloy steel has been investigated under two body abrasive wear conditions. The results show that the microstructure of the test steel is mastenite and bainite/mastenite when the specimen subjected to water quenching and blow cooling respectively. The hardness of the test steel was over 52HRC when the specimen subjected to water quenching and blow cooling, however, effect of tempering temperature on hardness is slightly. The strength of the test steel is increased with the tempering temperature increased and the impact toughness change slightly under the blow cooling condition. The tensile strength of the test steel is decreased and the yield strength is increased with the tempering temperature increased when the specimen subjected to water quenching and followed tempering. The wear rate is increased with load and the wear mechanism is micro-cutting and microploughing. The wear resistance of bainite/martensite is better than single-phase martensite. The hardness and impact toughness are important factor under two body abrasive wear condition.

Microstructure and Impact Toughness of High-Strength Low-Alloy Steel after Tempforming

2021 ◽  
Vol 122 (10) ◽  
pp. 1014-1022
Author(s):  
A. S. Dolzhenko ◽  
P. D. Dolzhenko ◽  
A. N. Belyakov ◽  
R. O. Kaibyshev
Keyword(s):  
Impact Toughness ◽  
Alloy Steel ◽  
High Strength ◽  
Low Alloy Steel

scholarly journals The Effect of Lath Martensite Microstructures on the Strength of Medium-Carbon Low-Alloy Steel

Crystals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 232 ◽  
Author(s):  
Chen Sun ◽  
Paixian Fu ◽  
Hongwei Liu ◽  
Hanghang Liu ◽  
Ningyu Du ◽  
...  
Keyword(s):  
Grain Size ◽  
Carbon Content ◽  
Lath Martensite ◽  
Block Size ◽  
Martensitic Steels ◽  
Austenite Grain Size ◽  
Medium Carbon ◽  
Transmission Electron ◽  
Lath Width ◽  
Effective Grain Size

Different austenitizing temperatures were used to obtain medium-carbon low-alloy (MCLA) martensitic steels with different lath martensite microstructures. The hierarchical microstructures of lath martensite were investigated by optical microscopy (OM), electron backscattering diffraction (EBSD), and transmission electron microscopy (TEM). The results show that with increasing the austenitizing temperature, the prior austenite grain size and block size increased, while the lath width decreased. Further, the yield strength and tensile strength increased due to the enhancement of the grain boundary strengthening. The fitting results reveal that only the relationship between lath width and strength followed the Hall–Petch formula of. Hence, we propose that lath width acts as the effective grain size (EGS) of strength in MCLA steel. In addition, the carbon content had a significant effect on the EGS of martensitic strength. In steels with lower carbon content, block size acted as the EGS, while, in steels with higher carbon content, the EGS changed to lath width. The effect of the Cottrell atmosphere around boundaries may be responsible for this change.

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