{"title":"Effect of Al addition on thermal fatigue deformation morphology in high heat-resistant ferritic stainless steel SUS444","authors":"Tetsuyuki Nakamura, Kyosuke Yoshimi","doi":"10.2355/isijinternational.isijint-2024-194","DOIUrl":null,"url":null,"abstract":"</p><p>Ferritic stainless steels are used for automobile exhaust parts because of their high heat and corrosion resistance. Among them, parts located upstream near the engine, so-called hot-end parts, for example, exhaust manifolds, are required to show excellent heat resistance. Since thermal fatigue is induced by repeating heating and cooling with mechanical strain restriction, thermal fatigue resistance is one of the most important properties of upstream exhaust-parts materials.</p><p>In this study, the effect of Al addition on thermal fatigue deformation morphology was investigated for high heat-resistant ferritic stainless steel SUS444 which has been used for automobile exhaust parts. In contrast with the steel without Al addition, which fracture morphology in thermal fatigue under the maximum temperature of 1,173 K was necking, cracking was predominant in the steel with Al addition without necking. Al addition has the effect to prevent necking in thermal fatigue under the maximum temperature of 1,173 K due to solid solution strengthening by Al.</p>\n<p></p>","PeriodicalId":14619,"journal":{"name":"Isij International","volume":null,"pages":null},"PeriodicalIF":1.6000,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Isij International","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.2355/isijinternational.isijint-2024-194","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract
Ferritic stainless steels are used for automobile exhaust parts because of their high heat and corrosion resistance. Among them, parts located upstream near the engine, so-called hot-end parts, for example, exhaust manifolds, are required to show excellent heat resistance. Since thermal fatigue is induced by repeating heating and cooling with mechanical strain restriction, thermal fatigue resistance is one of the most important properties of upstream exhaust-parts materials.
In this study, the effect of Al addition on thermal fatigue deformation morphology was investigated for high heat-resistant ferritic stainless steel SUS444 which has been used for automobile exhaust parts. In contrast with the steel without Al addition, which fracture morphology in thermal fatigue under the maximum temperature of 1,173 K was necking, cracking was predominant in the steel with Al addition without necking. Al addition has the effect to prevent necking in thermal fatigue under the maximum temperature of 1,173 K due to solid solution strengthening by Al.
铁素体不锈钢具有很高的耐热性和耐腐蚀性，因此被用于汽车排气管部件。其中，位于上游靠近发动机的部件，即所谓的热端部件（如排气歧管），要求具有出色的耐热性。由于热疲劳是在机械应变限制下通过反复加热和冷却引起的，因此抗热疲劳性是上游排气部件材料最重要的性能之一。在本研究中，研究了用于汽车排气部件的高耐热铁素体不锈钢 SUS444 添加 Al 对热疲劳变形形态的影响。与未添加铝的钢在最高温度 1,173 K 下的热疲劳断裂形态为颈缩相比，添加铝的钢在无颈缩的情况下主要出现裂纹。在最高温度为 1173 K 的热疲劳条件下，由于铝的固溶强化作用，添加铝具有防止颈缩的效果。
期刊介绍：
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.
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