结构钢材的韧性随温度降低而下降，其破坏形态也由塑性屈服向脆性断裂转变，构件的承载力也由强度控制变为材料的韧性控制。
The toughness of steel decreases as temperature drops, its breakage transfers from plasticity to brittleness and the loading capacity is controlled by the toughness, not the strength.
蠕铁的韧性——脆性转变温度铸态和退火态均随磷含量的增加而升高。
The ductile-embrittlement transition temperature of vermicular graphite cast iron increased with increasing phosphorus content both in the as-cast and annealed condition.
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