Influence of pre-strain on fracture toughness of 3rd generation advanced high strength steels

Materials Research Proceedings Pub Date : 2024-05-15 DOI:10.21741/9781644903131-134

L. Grifé

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Abstract

Abstract. The present work investigates the influence of pre-strain on the fracture toughness of 3rd Generation Advanced High Strength Steels (AHSS). Specifically, a Carbide Free Bainitic (CFB) and a Quenching and Partitioning (Q&P) steel have been studied, the properties of which are crucial for lightweight vehicle construction. Fracture toughness, which is a key parameter for crash performance applications, is assessed using the Essential Work of Fracture methodology. The study investigates the pre-straining states of uniaxial tension, plane strain, and equibiaxial tension in 1.5 mm Q&P and 1.4 mm CFB sheet-form steels of 1180 MPa tensile strength. Overall, Q&P steel demonstrates superior fracture toughness compared to CFB steel. Remarkably, the specific essential work of fracture (we) remains unaffected by pre-straining across different strain states. Nevertheless, pre-straining exerts a notable influence on the non-essential plastic work (βwp) due to the plastic energy consumed during pre-deformation. These results suggest that pre-strain has little or no influence on the fracture properties of AHSS, which is relevant for the design and manufacturing of high crash-performance and safety-related components.

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预应变对第三代先进高强度钢断裂韧性的影响

摘要本研究探讨了预应变对第三代先进高强度钢（AHSS）断裂韧性的影响。具体来说，研究了一种无碳化物贝氏体钢（CFB）和一种淬火与渗碳体钢（Q&P），这两种钢的特性对轻量化汽车制造至关重要。断裂韧性是碰撞性能应用的关键参数，采用断裂基本功方法对其进行了评估。研究调查了抗拉强度为 1180 兆帕的 1.5 毫米 Q&P 和 1.4 毫米 CFB 板形钢的单轴拉伸、平面应变和等轴拉伸的预拉伸状态。总体而言，Q&P 钢的断裂韧性优于 CFB 钢。值得注意的是，在不同的应变状态下，断裂的具体基本功（we）仍然不受预拉伸的影响。然而，由于预变形过程中消耗了塑性能，预拉伸对非必要塑性功（βwp）产生了显著影响。这些结果表明，预拉伸对 AHSS 的断裂性能影响很小或没有影响，这与设计和制造高碰撞性能和安全相关部件息息相关。

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

Materials Research Proceedings

CiteScore

0.30

自引率

0.00%

发文量