The effect of heat treatment on the mechanical properties of modified stainless steels

Metaloznavstvo ta obrobka metaliv Pub Date : 2022-06-30 DOI:10.15407/mom2022.02.045

Y. Aftandiliants

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Abstract

The paper presents the results of the study of the influence of structure on the mechanical properties of microalloyed and modified austenitic stainless steels. It is shown that the mechanical properties of cast austenitic stainless steels with a probability of 95 % and an error of 0.46 to 13.2 % are determined by such structural parameters as austenite grain size, carbide phase and ferrite content in austenite after quenching, quantity, size and distance between oxide, titanium sulfides and carbonitrides particles. Mathematical models of the structure influence on the yield strength, reduction of area and toughness of stainless steels are built. The structure parameter effectiveness is shown and it is shown that to increase the efficiency of strength, reduction of area and toughness of stainless steels at normal temperature structural factors affect in the following sequence: austenite grain size, volume fraction, size and distribution of titanium carbonitrides and sulfides, the total quantity of non-metallic inclusions, carbides and ferrite in austenite after hardening of stainless steel, as well as the volume fraction, size and distribution of oxide inclusions. Keywords: steel, structure, mechanical properties, strength, ductility, toughness.

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热处理对改性不锈钢力学性能的影响

本文介绍了组织对微合金化和改性奥氏体不锈钢力学性能影响的研究结果。结果表明，铸造奥氏体不锈钢的力学性能由奥氏体晶粒度、淬火后奥氏体中碳化物相和铁素体含量、氧化物、硫化钛和碳氮化物颗粒的数量、尺寸和距离等结构参数决定，其概率为95%，误差为0.46～13.2%。建立了结构对不锈钢屈服强度、截面积和韧性影响的数学模型。结构参数的有效性表明，为了提高不锈钢在常温下的强度、面积和韧性的效率，结构因素依次影响：奥氏体晶粒度、体积分数、碳氮化钛和硫化物的尺寸和分布、非金属夹杂物的总量、，不锈钢淬火后奥氏体中的碳化物和铁素体，以及氧化物夹杂物的体积分数、尺寸和分布。关键词：钢，结构，力学性能，强度，延展性，韧性。

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Metaloznavstvo ta obrobka metaliv

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8 weeks