The Microstructure Evolution and Precipitation Behavior within HSLA Steels with Different M/C Atomic Ratios

Chih Yuan Chen; Lung Jen Chiang; Chien Chon Chen; Jih Sheng Kuo; Ya Hsuan Chou

doi:10.4028/www.scientific.net/MSF.975.49

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HomeMaterials Science ForumMaterials Science Forum Vol. 975The Microstructure Evolution and Precipitation...

The Microstructure Evolution and Precipitation Behavior within HSLA Steels with Different M/C Atomic Ratios

Abstract:

The microstructure and hardening behavior of HSLA steels with different microalloying element/carbon (M/C) atomic ratios, namely high M/C steel (H-M/C) and low M/C steel (L-M/C), were investigated in the present study. A dual precipitation morphology of nanosized carbides, namely interphase precipitation carbides and random precipitation carbides, was found at the same ferrite grain of both kind of steels, and these precipitates are believed to provide the main strengthening ability within ferrite. Of the two steels with different M/C atomic ratios, the ferrite matrix of H-M/C steel showed a rising trend in micro-hardness with increasing isothermal holding times from 5 min to 60 min at 650°C to 700°C. This higher strengthening ability occurring within ferrite grains after holding at longer times can be ascribed to the higher austenite decomposition rate occurring in the H-M/C atomic ratio steel. Therefore, the hardening mechanisms in both kinds of steel are also discussed in the present study.

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7th Asia Conference on Mechanical and Materials Engineering

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Materials Science Forum (Volume 975)

Pages:

49-54

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.975.49

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Online since:

January 2020

Authors:

Chih Yuan Chen*, Lung Jen Chiang, Chien Chon Chen, Jih Sheng Kuo, Ya Hsuan Chou

Keywords:

HSLA, Interphase Precipitate, Precipitation, Random Precipitate, V Shaped Carbide

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