For maximum softness and ductility the cooling rate should be very slow, such as allowing the parts to cool down with the furnace.
为了得到最大柔软性和延展性冷却速率应该很慢，比如让零件与炉子一起冷下来。
In order to discuss the microstructure under slower cooling rate of as-cast AZ91D magnesium alloy, the slow solidification treatment was carried out.
为了探讨AZ 91d镁合金在较慢凝固冷却速度下的组织，对其进行了缓慢凝固处理。
The quenching operation is the most critical part of the heat treatment since too slow a rate of cooling might give rise to either soft spots or quenching cracks.
自太慢地冷却的比率也可能引起软的地点或淬熄裂缝之后，淬熄操作是热处理的最紧要关头的部份。
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