The thermo-mechanical controlled process (TMCP) of 800-MPa-grade non-quenched tempered steel used for penstocks was simulated on a Gleeble-3500 thermo-mechanical simulator. The effect of the finish cooling temperature (FCT) which ranged from 350–550 ◦C on the microstructure and mechanical properties was studied. The microstructure of TMCP specimens is primarily composed of lath bainite (LB) and...

SUS440 is a high-carbon stainless steel, and its martensite matrix has high heat resistance, high corrosion resistance, and high pressure resistance. It has been widely used in mechanical parts and critical materials. However, the SUS440 martempered matrix has reliability problems in thin plate applications and thus research uses different austempering heat treatments (tempering temperature: 20...

Specimens with different microstructures (bainite, as-quenched martensite, and tempered martensite) were fabricated using a Fe-0.4C-1.5Si-2Mn steel sheet, the pitting corrosion resistances of these compared. Retained austenite was barely detected in X-ray diffraction analysis. The Vickers hardness values ordered as (high) martensite > ≈ bainite 325°C-austempered specimen 425°C-austempered (low)...

Abstract This paper examined the cyclic deformation behaviour of multiphase low-carbon steel that was subjected to austempering heat treatments at four temperatures (190 °C, 230 275 and 315 °C) below martensite start temperature ( M s = 353 °C). The tests were conducted room temperature, under fully reversed strain-controlled conditions, with strain amplitudes in range 0.5–1.0%. microstructure ...

Abstract The microstructure evolution and impact toughness of the coarse grain heat-affected zone (CGHAZ) TiNbV microalloyed steels were investigated by using a thermal simulation test. samples treated with various simulated welding cycles. phase constituents sizes analyzed electron backscatter diffraction analysis. CGHAZ consisted ferrite, acicular pearlite, bainite. have higher under lower he...