B. Liu
,
J.X. Qu
,
W.J. Sun
金属学报(英文版)
The effect of di®erent peak temperature (Tp) and cooling time (t8=5) on hardness,
impact toughness and fracture morphology in the heat-affected zone (HAZ) of HQ130
steel was studied by using welding thermo-simulation test. Experimental results show
that the impact toughness and hardness decrease with the decrease of Tp or increase of
t8=5 under the condition of a single thermal cycle. There is a brittle zone in the vicinity
of Tp=800±C,where the impact toughness is considerably low. There is softened zone
in vicinity of Tp=700±C,Where the hardness decreases but the toughness increases. In
the practical application of multi-layer and multi-pass welding, the welding heat input
should be strictly limited (t8=5<=20s) so as to reduce the softness and brittleness in the
HAZ of HQ130 steel.
关键词:
high strength steel
,
null
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null
,
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