Fatigue Failure Analysis on Precracked 304 Stainless Steel Components Repaired by Laser with Addition of Nanocomposites

IF 0.3 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING
Jie Wang, Wei-wu Jiang
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引用次数: 2

Abstract

The service life of components can be extended by repairing fatigue crack with laser so as to improve resource utilization rate. However, the effect of laser repair may be influenced by the instability of laser treatment. To investigate the addition of nanocomposites on the laser repairing effect, fatigue test under uniaxial tension was carried out to evaluate the fatigue life of precracked 304 stainless steel components repaired by laser. According to the results obtained from fatigue tests, a probabilistic fatigue life distribution model considered the sampling size and discreteness of data was established based on the three-parameter Weibull distribution model and three-parameter stress-life equation. The results of probabilistic fatigue life distribution model show that the fatigue life of components repaired by laser with addition of WC nanocomposites can be enhanced significantly, especially the high cycle fatigue life. Moreover, the microstructure of repaired region show that the WC nanoparticles could refine the recrystallized grains and lead to the improvement of strength and toughness of material around crack tip, which are the main reason of improved fatigue life. Meanwhile, smooth surface of repaired region caused by WC nanoparticles can also prevent the initiation of microcracks. Key-words: Fatigue failure; Laser repair; WC nanocomposites; Microstructure.
纳米复合材料激光修复预制裂纹304不锈钢构件的疲劳失效分析
利用激光修复疲劳裂纹可以延长零件的使用寿命,提高资源利用率。然而,激光修复的效果可能受到激光治疗不稳定性的影响。为了研究纳米复合材料的加入对激光修复效果的影响,采用单轴拉伸疲劳试验对预制裂纹304不锈钢构件进行了激光修复的疲劳寿命评价。根据疲劳试验结果,基于三参数威布尔分布模型和三参数应力-寿命方程,建立了考虑样本量和数据离散性的概率疲劳寿命分布模型。概率疲劳寿命分布模型的结果表明,WC纳米复合材料的加入可显著提高激光修复部件的疲劳寿命,尤其是高周疲劳寿命。修复区显微组织分析表明,纳米WC能够细化再结晶晶粒,提高裂纹尖端周围材料的强度和韧性,是提高疲劳寿命的主要原因。同时,WC纳米颗粒使修复区域表面光滑,也可以防止微裂纹的产生。关键词:疲劳失效;激光修复;WC纳米复合材料;微观结构。
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来源期刊
Soldagem & Inspecao
Soldagem & Inspecao 工程技术-冶金工程
CiteScore
1.00
自引率
16.70%
发文量
13
审稿时长
12 weeks
期刊介绍: The Journal Soldagem & Inspeção (S&I) js a techno-scientific journal created in 1995. Printed issues of this journal are distributed free of charge to libraries in Brazil, Latin America and the Iberian Peninsula. It has been printed regularly every quarter since September, 2002, and, since the beginning of 2007, its electronic version is available in the address: (http://www.abs-soldagem.org.br/s&i/). The journal is sponsored by the Brazilian Welding Association (ABS). Since its creation several well known professionals working in welding contributed with the Journal Soldagem & Inspeção and its editorial board crosses the Brazilian borders. During its evolution the Journal received ta special contribution from the Editors-in-chief : Ronaldo Paranhos, Américo Scoti, Paulo Modenesi e Alexandre Bracarence. Since January 2012 the Editor-in-chief is Ana Sofia C. M. D’Oliveira, Full professor at Universidade Federal do Paraná (UFPR) . Her work focus mainly on Hardfacing and Physical Metallurgy. The jornal Soldagem & Inspeção also counts with 10 Associate Editors and a fix Editorial board of referees. short-term (Ad Hoc) referees can be invited to evaluate some papers submitted to the journal. The Soldagem & Inspeção journal is the scientific divulgation channel of the Brazilian Welding Association (ABS). It aims to publish original papers related to the scientific and technological development of welding, inspection, and related fields. Review papers or letters on current and controversial subjects are also published in the Journal. Its abbreviated title is Soldag. insp. (Impr.), which should be used in bibliographies, footnotes and bibliographical references and strips.
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