汽车用硼钢部件失效分析

IF 1.2 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Frattura ed Integrita Strutturale Pub Date : 2023-03-21 DOI:10.3221/igf-esis.64.09
M. Boniardi, A. Casaroli, Laura Sirangelo, Sergio Monella, Michele Mazzola
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引用次数: 0

摘要

汽车行业不断寻求新钢材和制造技术的创新组合,以提高工艺链效率并降低成本。为此,硼钢由于其高淬透性和可加工性而越来越受欢迎。由于其精加工步骤减少,硼钢通常使用精细冲裁技术进行加工。硼钢部件精冲裁的成功是由于必须仔细设计热处理,以避免析出会降低钢淬透性的富硼化合物。在高温下,硼与氧和氮的反应性很强。本文的主要重点是展示汽车零部件热处理过程中可能出现的一些缺陷。在两种不同的硼钢,即EN 34MnB5和EN 22MnB5上进行了实验活动。钢样品预先在中性环境(氢气/氮气环境)中进行球化退火,然后进行精细冲裁,以获得特定的汽车部件,随后进行淬火和回火。实验测试表明,纳米化合物沉淀,导致强烈的晶粒细化和钢淬透性的局部降低。在最初的球化退火处理过程中,淬透性问题又回到了氮吸收问题上。
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Failure Analysis of Boron Steel Components for Automotive Applications
The automotive industry is continuously looking for an innovative mix of new steels and manufacturing techniques in order to improve process chain efficiency and cost reduction. To this aim, boron steels are becoming increasingly popular thanks to their high hardenability and machinability. Due to their reduced finishing steps, boron steels are commonly processed using fine blanking technologies. The success of fine blanking on boron steel components is due to heat treatments which must be carefully designed to avoid precipitation of boron-rich compounds that would lower steel hardenability. At high temperature, boron is very reactive with oxygen and nitrogen. The main focus of this paper is to show some drawbacks that can occur during heat treatments of automotive components. An experimental campaign was performed on two different boron steels, namely EN 34MnB5 and EN 22MnB5. The steel samples were previously spheroidized annealed in a neutral environment (hydrogen/nitrogen atmosphere), and then fine blanked to obtain specific automotive components which were subsequently quenched and tempered. Experimental tests revealed precipitation of nanometric compounds, causing strong grain refinement and localized decrease of steel hardenability. Hardenability problems were brought back to nitrogen pick-up during initial spheroidize annealing treatments.
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来源期刊
Frattura ed Integrita Strutturale
Frattura ed Integrita Strutturale Engineering-Mechanical Engineering
CiteScore
3.40
自引率
0.00%
发文量
114
审稿时长
6 weeks
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