Effects of thermomechanical treatment on the occurrence of coincident site lattice boundaries in high strength low alloy steel

Castro, Renato Soares de; Ferreira, Ricardo Artur Sanguinetti; Pedrosa, Igor Rafael Vilarouco; Yadava, Yogendra Prasad

doi:10.1590/s1516-14392013005000132

Cited by 4 publications

(2 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is consistent with the higher misorientation angle peak frequency around 60° for weld metal W (Fig. 6a) because in body-centered cubic lattices, the Σ3 boundaries are related to 60° misorientation [30,31]. Additionally, an increase in nickel content increases 60° misorientation [32] and this boundary is closely related to the martensite fraction [25], which is also increased by Ni addition [25].…”

Section: Resultssupporting

confidence: 78%

Influence of Chemical Composition on the Mechanical and Microstructural Properties of High Strength Steel Weld Metals Submitted to PWHT

Gomes

Jorge

Bott

et al. 2019

Metallogr. Microstruct. Anal.

View full text Add to dashboard Cite

The development of new filler metals for offshore industry is challenging because high strength and toughness levels are required after post-welding heat treatment (PWHT) is applied to reduce residual stresses. The higher chromium contents added to the chemical composition of welding consumables to attain the required ultimate tensile strength are usually associated with reduced toughness. This work presents a comparative analysis of the behavior of two high strength steel weld metals with different Cr-Mo and Mn-Ni additions that were submitted to PWHT. Weld metals obtained by shielded metal arc welding process were evaluated using mechanical tests (Charpy-V notch and Vickers microhardness) and microstructural analysis (scanning electron microscopy and electron backscattered diffraction) conducted in samples removed from the center line of weld deposits, both in the as-welded and heat-treated (600 °C for 1 h) conditions. Although similar results were obtained in the as-welded condition, different behaviors were observed after PWHT. While impact toughness for Cr-Mo additions was reduced by carbide precipitation, as predicted by thermo-calc simulation, weld metal based on Ni-Mn addition exhibited improvements after PWHT because the predominantly martensite microstructure was tempered. This makes the latter more appropriate for weldments submitted to PWHT.

show abstract

Section: Resultssupporting

confidence: 78%

Influence of Chemical Composition on the Mechanical and Microstructural Properties of High Strength Steel Weld Metals Submitted to PWHT

Gomes

Jorge

Bott

et al. 2019

Metallogr. Microstruct. Anal.

View full text Add to dashboard Cite

show abstract

“…The results obtained were similar to those obtained in this. Pedrosa et al 10 and Castro et al 11 to increase the mechanical properties in high-strength and low-alloy steels (HSLA) have already successfully used Thermomechanical sequences, similar to those used in this work.…”

Section: Resultsmentioning

confidence: 99%

Influence of Thermomechanical Sequences on the Mechanical Properties of DP 800 Steel

et al. 2021

View full text Add to dashboard Cite

The influence of thermomechanical processing sequences on the microstructure and mechanical properties of Advanced High-Strength Steels (AHSS) DP800 steel was studied. Initially, the phase transformation domains were identified by dilatometry. Based on the identification of these domains, some thermomechanical sequences were produced. In all sequences, the steel was austenitized at 900 ° C for 20 minutes, followed by a 10% deformation (rolling) and then quenched. After tempering, the material was reheated to decompose under different conditions of time and temperature. For the decomposition, temperatures of 380 °, 480 °, 580 ° and 680ºC were used, in times of 15 and 30 minutes. After treatments, samples were prepared by metallography for microstructural characterization by scanning electron microscopy (SEM). The phases present in the microstructures produced by the different treatment sequences could be identified. The mechanical properties were determined by uniaxial tensile test on a servo-hydraulic machine. Some of the tested thermomechanical sequences showed better values than those required by the standard. The sequence that showed the best results was performed at 680 °C in 15 minutes. In which, an increase of 8% in the yield strength, 12.25% in the ultimate tensile strength and 97.3% in the elongation was observed.

show abstract

Microstructural peculiarities and textural characteristics of Ni–W sheet alloy after accumulative roll-bonding and annealing

et al. 2020

View full text Add to dashboard Cite

In the present study, the through thickness morphological and textural characteristics of a Ni-14W sheet, processed by accumulative roll-bonding (ARB) up to 4 cycles (ε = 3.2) and annealed at 1100 °C for 1 h, were investigated using electron backscatter diffraction. In the internal layers, the microstructure exhibited a small grains size free of twins and contained high fraction of low angle grain boundaries due the domination of {001}〈100〉 Cube orientation. At the surface layers, grains were coarser and contained high fraction of twins, while texture was characterized by retained shear components. The results showed that the heterogeneity of annealed microstructure texture decreased with the increasing number of ARB processing. Particle stimulated nucleation mechanism was evidenced at the vicinity of some bonding interfaces due to the presence of metallic inclusions resulting from wire-brushing procedure. As a result, the orientation of the new recrystallized grains was rather random and the grain size was stabilized by a pining effect which contributed to the microstructure heterogeneity. A successful bonding was achieved with increasing number of ARB cycles as shown by the transformation of interfaces into grain boundaries and their subsequent migration.

show abstract

Effects of thermomechanical treatment on the occurrence of coincident site lattice boundaries in high strength low alloy steel

Cited by 4 publications

References 16 publications

Influence of Chemical Composition on the Mechanical and Microstructural Properties of High Strength Steel Weld Metals Submitted to PWHT

Influence of Chemical Composition on the Mechanical and Microstructural Properties of High Strength Steel Weld Metals Submitted to PWHT

Influence of Thermomechanical Sequences on the Mechanical Properties of DP 800 Steel

Microstructural peculiarities and textural characteristics of Ni–W sheet alloy after accumulative roll-bonding and annealing

Contact Info

Product

Resources

About