scholarly journals Effects of Micro-alloying on Susceptibility to Intergranular Fracture at about 600°C in Heat-affected Zone of High Strength Low Alloy Steel

1981 ◽  
Vol 67 (9) ◽  
pp. 1523-1532 ◽  
Author(s):  
Toshimitsu W-FUJII ◽  
Koichi YAMAMOTO ◽  
Masakatsu UENO
Keyword(s):  
Alloy Steel ◽  
Intergranular Fracture ◽  
Heat Affected Zone ◽  
High Strength ◽  
Low Alloy Steel

Effect of Microstructure on High-Strength Low-Alloy Steel Welded Joint Toughness with Simulation of Heat-Affected Zone Coarse-Grained Area

Metallurgist ◽  
2021 ◽  
Vol 64 (9-10) ◽  
pp. 875-884
Author(s):  
K. G. Vorkachev ◽  
P. P. Stepanov ◽  
L. I. Éfron ◽  
M. M. Kantor ◽  
A. V. Chastukhin ◽  
...  
Keyword(s):  
Alloy Steel ◽  
Heat Affected Zone ◽  
Welded Joint ◽  
High Strength ◽  
Coarse Grained ◽  
Low Alloy Steel ◽  
Effect Of Microstructure

scholarly journals Effect of Molybdenum on the Impact Toughness of Heat-Affected Zone in High-Strength Low-Alloy Steel

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1430
Author(s):  
Xiaoyan Wu ◽  
Pengcheng Xiao ◽  
Shujing Wu ◽  
Chunliang Yan ◽  
Xuegang Ma ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Alloy Steel ◽  
Heat Affected Zone ◽  
Laser Scanning ◽  
Lattice Misfit ◽  
High Strength ◽  
Optical Microscope ◽  
Low Alloy Steel ◽  
Number Density ◽  
The Impact

The microstructure, precipitates, and austenite grain in high-strength low-alloy steel were characterized by optical microscope, transmission electron microscope, and laser scanning confocal microscopy to investigate the effect of Mo on the toughness of steel. The microstructure was refined and the toughness was enhanced after the addition of 0.07% Mo in steel. The addition of Mo can suppress the Widmanstätten ferrite (WF) formation and promote the transformation of acicular ferrite (AF), leading to the fine transformed products in the heat-affected zone (HAZ). The chemical composition of precipitates changed from Nb(C, N) to (Nb, Mo)(C, N) because of the addition of Mo. The calculated lattice misfit between Nb(C, N) and ferrite was approximately 11.39%, while it was reduced to 5.40% for (Nb, Mo)(C, N), which significantly affected the size and number density of precipitates. A detailed analysis of the precipitates focusing on the chemical composition, size, and number density has been undertaken to understand the contribution of Mo on the improvement of steel toughness.

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