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| Toughness Of Heat--Affected Zone Of 800 MPa Grade Low Alloy Steel |
| ZHAO Lin; ZHANG Xudong; CHEN Wuzhu |
| Department of Mechanical Engineering; Tsinghua University; Beijing 100084 |
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Cite this article:
ZHAO Lin; ZHANG Xudong; CHEN Wuzhu. Toughness Of Heat--Affected Zone Of 800 MPa Grade Low Alloy Steel. Acta Metall Sin, 2005, 41(4): 392-396 .
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Abstract The microstructure and toughness of the coarse--grained heat--affected
zone (CGHAZ) in laser welding of RPC (relaxation--precipitation
controlling transformation) steel were investigated by thermal simulation
with a Gleeble-1500 thermal simulator. The influence of
the time cooled from 800-500℃, t8/5(0.3-30 s), on the
microstructure of CGHAZ and the low temperature toughness were discussed.
The experimental results indicate that the granular bainite is the dominate
microstructure of the CGHAZ in laser welding of RPC steel, and the
impact energy of the CGHAZ is much higher than that of base metal when
t8/5 is between 3 s and 8 s. Considering the effect of the size,
volume, number and shape of the M-A constituent on the toughness,
a toughness factor of the M-A constituent is defined. As the toughness
factor increases, the toughness of the granular bainite increases. The
varied trend of the impact toughness with t8/5 is mainly determined
by the toughness factor of the M-A constituent.
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Received: 13 July 2004
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