Effects of Boron Addition on Low Cycle Bending Fatigue Strength of Gas Carburized Low Alloy Steel

IF 0.3 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

Tetsu To Hagane-journal of The Iron and Steel Institute of Japan Pub Date : 2023-01-01 DOI:10.2355/tetsutohagane.tetsu-2023-092

Ai Goto, Masato Yuya, Kaori Kawano

引用次数: 0

Abstract

The effect of boron addition on low cycle bending fatigue strength of carburized steel was investigated. The low-cycle bending fatigue strength of B-added steel was improved compared to SCM420. When the fatigue failure was divided into the crack initiation process and the crack propagation process, the addition of boron did not affect the crack initiation life, but improved the crack propagation life. The presence of boron in B-added steels was evaluated using TOF-SIMS and AES measurements. Grain boundary segregation of boron was not observed in the gas carburized surface layer, but precipitation of BN was observed. On the other hand, grain boundary segregation of boron was observed from the carburized surface layer toward the 400 μm core side. Therefore, it is considered that the grain boundary strengthening effect of boron was not obtained in the carburized surface layer, and the crack initiation life did not change.

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硼对气体渗碳低合金钢低周弯曲疲劳强度的影响

研究了添加硼对渗碳钢低周弯曲疲劳强度的影响。与SCM420相比，添加b的钢的低周弯曲疲劳强度得到了提高。当疲劳破坏分为裂纹萌生过程和裂纹扩展过程时，硼的加入对裂纹萌生寿命没有影响，反而提高了裂纹扩展寿命。用TOF-SIMS和AES测量方法对加硼钢中硼的存在进行了评价。在气体渗碳的表层中没有观察到硼的晶界偏析，但有BN的析出。另一方面，硼的晶界偏析从渗碳的表层向400 μm的芯侧发生。因此，认为硼在渗碳面层未产生晶界强化作用，裂纹起裂寿命未发生变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Tetsu To Hagane-journal of The Iron and Steel Institute of Japan 工程技术-冶金工程

CiteScore

0.70

自引率

33.30%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal ISIJ International first appeared in 1961 under the title Tetsu-to-Hagané Overseas. The title was changed in 1966 to Transactions of The Iron and Steel Institute of Japan and again in 1989 to the current ISIJ International. The journal provides an international medium for the publication of fundamental and technological aspects of the properties, structure, characterization and modeling, processing, fabrication, and environmental issues of iron and steel, along with related engineering materials. Classification I Fundamentals of High Temperature Processes II Ironmaking III Steelmaking IV Casting and Solidification V Instrumentation, Control, and System Engineering VI Chemical and Physical Analysis VII Forming Processing and Thermomechanical Treatment VIII Welding and Joining IX Surface Treatment and Corrosion X Transformations and Microstructures XI Mechanical Properties XII Physical Properties XIII New Materials and Processes XIV Social and Environmental Engineering.