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首页> 外文会议>63rd World Foundry Congress Sep 12-18, 1998 Budapest, Hungary >THE INFLUENCE OF CHEMICAL COMPOSITION AND SULPHIDE MORPHOLOGY ON IMPACT TOUGHNESS OF LOW-ALLOYED CAST STEEL
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THE INFLUENCE OF CHEMICAL COMPOSITION AND SULPHIDE MORPHOLOGY ON IMPACT TOUGHNESS OF LOW-ALLOYED CAST STEEL

机译：化学成分和硫化物形态对低合金铸钢冲击韧性的影响

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摘要

The paper is based on the assumption that the dependent variable (impact toughness) is in a causal relationship with random (unintentional) changes in melting technology parameters. The latter are manifested as variations of concentrations of individual chemical components and quantified as changes in impact toughness of the steel casting. Investigations were carried out under industrial conditions and the results obtained present a basis for controlling the melt and optimizing the melting technology of steel casting in the electric arc furnace. The relationship between the chemical composition and the morphology of the precipitated sulphides was examined for low-alloyed steel casting grade LC2, specified in accordance with ASTM A 352/A, in terms of impact toughness measurement in V-notch specimens at -73℃. The results were statistically analysed and verified by metallographic and fractographic examinations. It was found that impact toughness of steel casting LC2, intended for low-temperature service, was strongly influenced by oxygen, sulphur and manganese contents. Low impact toughness values accompanied by the appearance of brittle fracture, as a result of precipitation of type II manganese sulphides, were obtained with the precisely defined proportions of the three variables mentioned.
机译：本文基于这样一个假设，即因变量（冲击韧性）与熔融技术参数的随机（无意）变化具有因果关系。后者表现为各个化学成分浓度的变化，并量化为铸钢件冲击韧性的变化。在工业条件下进行了研究，所获得的结果为控制电弧炉中钢水的熔融和优化钢水的熔融技术提供了基础。对于低合金铸钢LC2（根据ASTM A 352 / A规定），根据V缺口试样在-73℃下的冲击韧性测量，检查了化学成分与沉淀的硫化物形态之间的关系。对结果进行统计分析，并通过金相和分形检查进行验证。已经发现，打算用于低温工作的铸钢LC2的冲击韧性受到氧，硫和锰含量的强烈影响。通过精确定义上述三个变量的比例，可获得低冲击韧性值，并伴随着II型硫化锰的沉淀而出现脆性断裂。

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