Effect of Cooling Process Parameters on Microstructure and Mechanical Properties of Marine Engineering H-Beam Steel

doi:10.12068/j.issn.1005-3026.2019.04.005

Abstract

Abstract: The effect of different process parameters on the microstructure and mechanical properties of marine engineering H-beam steel(SM490YB) were studied through the hot rolling and ultra-fast cooling experiments. The mechanisms of strengthening and toughening of SM490YB steel were analyzed. The results showed that with decreasing temperature of the final cooling， the contents of bainite and acicular ferrite increase at the same position in thickness direction of the tested steel， in contrast to those of polygonal ferrite and pearlite. Moreover， the strength and low-temperature toughness of the steel increase with the decrease of the final cooling temperature. When the final cooling temperature is 480℃ and the heat return temperature is 554℃， the performance of mechanical property is the best. The increase of the cooling rate can improve the strength of the tested steel， however the excessive cooling rate can deteriorate the toughness.

Key words: marine engineering H-beam steel, ultra-fast cooling, high strength, large size, bainite

CLC Number:

TG142.1

DONG Chun-yu， ZHAO Xian-ming， ZHOU Xiao-guang， ZHAO Jing-li. Effect of Cooling Process Parameters on Microstructure and Mechanical Properties of Marine Engineering H-Beam Steel[J]. Journal of Northeastern University Natural Science, 2019, 40(4): 478-482.

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