The Behavior of Second Phase Particles in a Ti-Nb Microalloyed Steel during Welding Thermal Cycle

Mao Ai Chen; Chuan Song Wu

doi:10.4028/www.scientific.net/AMR.936.1786

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 936The Behavior of Second Phase Particles in a Ti-Nb...

The Behavior of Second Phase Particles in a Ti-Nb Microalloyed Steel during Welding Thermal Cycle

Abstract:

The behavior of second-phase particles in a microalloyed steel during weld thermal cycle has been investigated using analytical electron microscopy. All the particles in the base metal contains Nb and Ti, and the Nb weight fraction of the analyzed particles ranged from 0.22 to 0.85. During the heating stage of the weld thermal cycle, the small particles which were rich in Nb disappeared through complete dissolution and the large particles survived the weld thermal cycle with Nb weight fraction decreased. With a high cooling rate (t_8/5 no greater than 60s), only heterogeneous re-precipitation occurred during cooling. With a low cooling rate (t_8/5 = 120s), homogenous re-precipitation also occurred, producing a large number of small Nb-rich particles during cooling.

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Periodical:

Advanced Materials Research (Volume 936)

Pages:

1786-1790

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.936.1786

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Online since:

June 2014

Authors:

Mao Ai Chen*, Chuan Song Wu

Keywords:

Microalloyed Steel, Second Phase Particle, Weld Thermal Cycle

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