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首页> 外文期刊>Metallurgia Italiana >INVESTIGATION OF SECONDARY PHASES EFFECT ON 2205 DSS FRACTURE TOUGHNESS
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INVESTIGATION OF SECONDARY PHASES EFFECT ON 2205 DSS FRACTURE TOUGHNESS

机译：2205 DSS断裂韧度的二次相研究

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摘要

It is well known that the fracture toughness of DSS is strongly reduced by the precipitation of various inter-metallic phases occurring in the temperature range 600-1000 deg C. A large decrease in impact fracture toughness occurs even at room temperature for volume fractions of intermetallic phases lower than 1 percent, when only small and rare particles are present. In the present investigation, the influence of the intermetallic phases on the impact fracture behaviour of a 2205 grade DSS has been investigated. Samples containing different amounts of the intermetallic phases have been obtained by isothermal aging treatments in the range 800-950 deg C. The results of the impact tests confirm that the dangerous phase content determine both the toughness and the fracture behaviour of the DSS examined. At content lower than 1 percent, when precipitates are rare and small, their effect is a reduction of the absorbed energy for the ductile fracture. But the 1 percent appears as the critical content, when some particles became large enough to operate the nucleation of the brittle fracture. Indeed, at higher content, a number of large particles are present, well sufficient to induce a general brittle fracture. The obtained results allow correlating the absorbed energy values with the intermetallic phases content and dimensions.
机译：众所周知，在600-1000℃的温度范围内发生的各种金属间相的析出会大大降低DSS的断裂韧性。即使在室温下，对于金属间化合物的体积分数，冲击断裂韧性也会大大降低。当只有小而稀有的颗粒存在时，相低于1％。在本研究中，已经研究了金属间相对2205级DSS冲击断裂行为的影响。通过在800-950摄氏度范围内的等温时效处理，获得了含有不同量金属间相的样品。冲击试验的结果证实，危险相的含量决定了所检验DSS的韧性和断裂行为。含量低于1％时，当析出物很少且很少时，其作用是减少了韧性断裂吸收的能量。但是，当一些颗粒变得足够大以致使脆性断裂成核时，1％的含量就作为临界含量出现。实际上，在较高含量下，存在大量大颗粒，足以引起一般的脆性断裂。获得的结果允许将吸收的能量值与金属间相的含量和尺寸相关联。

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