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Abstract:
Mechanical properties, tensile strength and fracture strain of
0.11%C liquid-forged carbon steel in liquid-solid stage during
solidification were determined for the first time by tensile test with
the glenble-1500 thermo-mechanics analog machine. The experiment showed
that the liquid-solid co-existing range of 0.11%C carbon steel can be
divided into three zones, each of which has different mechanical
behaviors. In zoneⅠ, the tensile strength equals zero, the fracture
strain has a high level but reduces sharply in quantity with the
declining of the temperature. In zone Ⅱ, with the declining of the
temperature, the tensile strength develops gradually while the fracture
strain reduces further to the lowest level. In zone Ⅲ, both the tensile
strength and the fracture strain increase sharply in quantity as the
temperature further declines. It is very clear that zone Ⅱ (1495～1505℃)
is the hot brittleness zone where the hot crack occurs easily.
Observation and analyzing of the fracture surfaces of the specimens has
further testified the above result.
Key words: 液态模锻 力学性能 热裂纹
Received
199005, received in revised form 199102
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