Effect of Quenching-and-Tempering Heat Treatment on Mechanical Properties and Heat-Affected Zone Softening Behavior of Ultra-High Strength Steel
Source abstract
Abstract
At present, the heat treatment process tends to focus on the strength and toughness of high strength steel, while ignoring the softening behavior of welding heat-affected zone (HAZ). The effect of austenitizing temperature and tempering temperature on mechanical properties and HAZ softening behavior of ultra-high strength steel (UHSS) are investigated. The results indicate that the optimum combination of strength, toughness and degree of HAZ softening can be achieved by quenching at 950 °C and tempering at 650 °C. With the increase of austenitizing temperature from 890 to 980 °C, more carbides dissolved in the matrix and the prior austenite grain size (PAGS) increased. Therefore, after tempering at 650 °C, the strength increases first and then decreases slightly under the combined effect of the enhancement of precipitation strengthening and the decline of grain boundary strengthening. When the tempering temperature increases from 350 to 650 °C, the toughness of the samples quenched at 950 °C increases from 27.3 to 73.1 J, attributed to the decrease of carbon content and dislocation density of the matrix, and the increase of high-angle grain boundary (HAGBs) density. The austenitizing temperature has a great influence on the degree of HAZ softening. With the austenitizing temperature increasing from 920 to 980 °C, the degree of HAZ softening becomes more serious due to the over-grown recrystallized grains and coarsened carbides.
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Research context
OpenAlex topics: Microstructure and Mechanical Properties of Steels · Metal Alloys Wear and Properties · Welding Techniques and Residual Stresses
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (36)
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