Journal ArticleDOI
Influence of thermomechanical treatments on the microstructure and mechanical properties of HSLA-100 steel plates
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In this article, the influence of thermomechanical treatment (TMT) on the microstructure and mechanical properties of HSLA-100 steel have been studied, and the effect of TMT on the strength and toughness of DQ and RQ steels has been investigated.Abstract:
The influence of thermomechanical treatment (TMT), i.e., controlled rolling and direct quenching, as a function of rolling temperature and deformation on the microstructure and mechanical properties of HSLA-100 steel have been studied. The optical microstructure of the direct quenched (DQ) and tempered steel rooled at lower temperatures (800 °C and 900 °C) showed elongated and deformed grains, whereas complete equiaxed grains were visible after rolling at 1000 °C. The transmission electron microscope (TEM) microstructure of the 800 °C rooled DQ steel showed shorter, irregular, and closer martensite laths with extremely fine Cu and Nb(C,N) precipitates after tempering at 450 °C. The precipitates coarsened somewhat after tempering at 650 °C; the degree of coarsening was, however, less compared to that of the reheat-quenched (RQ) and tempered steel, indicating that the DQ steel was slightly more resistant to tempering. Similar to the RQ steel, at a 450 °C tempering condition, the DQ steel exhibited peak strength with extremely poor impact toughness. After tempering at 650 °C, the toughness of the DQ steel improved significantly, but at the expense of its strength. In general, the strength of the DQ and tempered steel was good and comparable to that of the RQ and tempered steel, although, its impact toughness was marginally less than the latter. The optimum combination of strength and toughness in the DQ steels was achieved after 900 °C rolling with 50 pct deformation, followed by direct quenching and tempering at 650 °C (yield strength (YS)=903 MPa, ultimate tensile strength (UTS)=928 MPa, and Charpy V-notch (CVN) strength=143 J at −85 °C).read more
Citations
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Journal ArticleDOI
Effect of direct quenching on the microstructure and mechanical properties of the lean-chemistry HSLA-100 steel plates
S. K. Dhua,S.K. Sen +1 more
TL;DR: In this article, the influence of direct quenching on structure-property behavior of lean chemistry HSLA-100 steels was studied, and it was shown that the mechanical properties of the direct-quench and tempered plates were superior to the reheat quench and tempering.
Journal ArticleDOI
Influence of Aging and Thermomechanical Treatments on the Mechanical Properties of a Nanocluster-Strengthened Ferritic Steel
Zhongwu Zhang,Zhongwu Zhang,C.T. Liu,C.T. Liu,Yuren Wen,Akihiko Hirata,Sheng Guo,Sheng Guo,Guang Chen,Mingwei Chen,Bryan A. Chin +10 more
TL;DR: In this paper, the effect of aging and thermomechanical treatments on the mechanical properties of a nanocluster-strengthened ferritic steel, Fe-1.5Mn-2.5Cu-4.0Ni1.0Al (wt pct).
Journal ArticleDOI
Effects of welding and post-weld heat treatments on nanoscale precipitation and mechanical properties of an ultra-high strength steel hardened by NiAl and Cu nanoparticles
TL;DR: In this paper, the effects of welding and post-weld heat treatment (PWHT) on nanoscale co-precipitation, grain structure, and mechanical properties of an ultra-high strength steel were studied through a combination of atom probe tomography (APT) and mechanical tests.
Journal ArticleDOI
Relationship Among Microstructure and Properties and Heat Treatment Process of Ultra-High Strength X120 Pipeline Steel
Min Zhou,Lin-xiu Du,Xianghua Liu +2 more
TL;DR: In this paper, the variation of heat treatments including directed quenching and tempering off-line after controlled rolling (DQT) and quenched offline and after-controlled rolling (RQT), with microstructure and mechanical properties of a low-carbon microalloyed steel was compared and analyzed.
Journal ArticleDOI
The effect of increasing Cu and Ni on a significant enhancement of mechanical properties of high strength low alloy, low carbon steels of HSLA-100 type
TL;DR: In this article, the effect of increasing the amount of Cu and Ni on the mechanical properties of high strength low alloy steels has been investigated using optical microscope and Filed Emission Scanning Electron Microscope (FE-SEM).
References
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Book
Thermomechanical Processing of High-Strength Low-Alloy Steels
TL;DR: In this article, the authors describe a thermomechanical processing of high-strength low-alloy steels using high strength low alloy (HLSL) steels.
Journal ArticleDOI
Continuous cooling transformations and microstructures in a low-carbon, high-strength low-alloy plate steel
TL;DR: In this paper, a continuous cooling-transformation (CCT) diagram was determined for a high-strength low-alloy plate steel containing (in weight percent) 0.06 C, 1.45 Mn, 0.97 Ni and 0.42 Mo. Dilatometric measurements were supplemented by microhardness testing, light microscopy, and transmission electron microscopy.
Journal ArticleDOI
Effect of tempering temperatures on the mechanical properties and microstructures of HSLA-100 type copper-bearing steels
TL;DR: In this article, two copper-bearing high-strength low-alloy (HSLA) steels with chemistry similar to HSLA-100, were made on a laboratory scale, one in an air induction (100 kg) furnace and the other in a vacuum induction (50 kg).
Journal ArticleDOI
Austenite decomposition during continuous cooling of an HSLA-80 plate steel
TL;DR: In this article, the decomposition of fine-grained austenite (10-µm grain size) during continuous cooling of an HSLA-80 plate steel (containing 0.05C, 0.50Mn, 1.12Cu and 0.20Mo) was evaluated by dilatometric measurements, light microscopy, scanning electron microscopy (SEM), transmission electron microscope (TEM), and microhardness testing.
Journal ArticleDOI
Influence of Tempering on the Microstructure and Mechanical Properties of HSLA-100 Steel Plates
TL;DR: The influence of tempering on the microstructure and mechanical properties of HSLA-100 steel has been studied in this paper, where the plate samples were tempered from 300 °C to 700 °C for 1 hour after austenitizing and water quenching.