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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructural Effects on Fracture Behavior of Ferritic and Martensitic Structural Steels
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Microstructural Effects on Fracture Behavior of Ferritic and Martensitic Structural Steels

机译：显微组织对铁素体和马氏体结构钢断裂行为的影响

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摘要

The effect of microstructure on fracture behavior of 1Cr-0.5Mo and 9Cr-1Mo structural steels was evaluated. 1Cr-0.5Mo steel is used in steam pipes and superheater tubes of power stations. Its microstructure is typically comprised of bainite in a pre-eutectoid ferrite matrix with an average grain size of 10 μm. 9Cr-1Mo steel was developed for applications in steam power stations and as a candidate structural material for first-wall and blanket components of future fusion reactors. Its microstructure consisted of a fully martensitic structure with a prior austenite grain size of 25 μm. The fracture properties were measured using instrumented impact testing at temperatures between -196 and 300℃. The total impact fracture energy, the crack initiation and propagation energy, the dynamic yield strength, the brittleness temperature, and the cleavage fracture stress were measured. The bainitic-ferritic alloy steel exhibited much higher resistance to ductile fracture at high test temperatures, while its resistance to brittle fracture at low test temperatures was reduced compared to that of the fully martensitic alloy steel. The results were discussed in terms of the chemical composition and microstructure of the two steel types.
机译：评估了显微组织对1Cr-0.5Mo和9Cr-1Mo结构钢的断裂行为的影响。 1Cr-0.5Mo钢用于电站的蒸汽管和过热器管。它的微观结构通常由贝氏体组成，该贝氏体位于预共析铁素体铁素体基体中，平均晶粒尺寸为10μm。 9Cr-1Mo钢被开发用于蒸汽发电站，并作为未来聚变反应堆第一壁和盖层组件的候选结构材料。其微观结构由完全马氏体组织组成，其先前的奥氏体晶粒尺寸为25μm。断裂性能是在-196至300℃的温度下使用仪器冲击试验测量的。测量总冲击断裂能，裂纹萌生和扩展能，动态屈服强度，脆性温度和解理断裂应力。与全马氏体合金钢相比，贝氏体-铁素体合金钢在较高的测试温度下表现出更高的抗延性断裂性能，而在较低的测试温度下其抗脆性断裂性能降低。根据两种钢的化学成分和显微组织对结果进行了讨论。

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