Synergistic enhancement mechanism of mechanical properties and hydrogen embrittlement resistance in medium Mn steels by coupling warm/cold rolling and delta ferrite

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science and Engineering: A Pub Date : 2024-11-07 DOI:10.1016/j.msea.2024.147506

Zheng Wang , Zhilin Li , Jinxu Li , Xi Zhu , Zifei Zhao , Juanping Xu , Yao Zhou , Zhishan Mi , Zhongmin Wan

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Abstract

In the present research, Fe-0.2C–6Mn–3Al-0/0.6Si steels were labeled as 0Si (without δ-ferrite) and 6Si samples (with abundant δ-ferrite). The hot-rolled annealed 0Si samples (i.e. 0SiHRA), and 6Si samples subjected to the warm-rolling, warm-rolled annealing and cold-rolled annealing (i.e. 6SiWR, 6SiWRA and 6SiCRA) were investigated. 0SiHRA shows the lath-type, 6SiWR shows the elongated and 6SiWRA and 6SiCRA reveal the equiaxed microstructure. Compared to 0SiHRA, the mechanical properties and the hydrogen embrittlement (HE) resistance are generally enhanced in 6Si samples. H-induced cracks (HICs) in 0SiHRA mainly nucleate at γ(α′)/α interfaces and propagate along the prior austenite grain boundaries with little propagation resistance, thus showing the low HE resistance. HICs in 6SiWR and 6SiWRA nucleate at γ(α′)/α and (γ(α′)+α)/δ interfaces and propagate longitudinally. Subsequently, the elongated microstructure tearing in 6WR and the equiaxed grains intergranular fracture in 6SiWRA result in HICs transverse propagation. The fracture behaviors in 6SiWR and 6SiWRA consume the vast energy, thus enhancing HE resistance. This work provides a vital insight for the rolling technology and the microstructural design to improve the mechanical properties and HE resistance for the high-strength medium Mn steels.

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通过冷/热轧和三角铁素体耦合提高中锰钢机械性能和抗氢脆性能的协同机制

在本研究中，Fe-0.2C-6Mn-3Al-0/0.6Si 钢被标记为 0Si（不含 δ-铁素体）和 6Si（含有大量 δ-铁素体）。研究了热轧退火的 0Si 样品（即 0SiHRA），以及经过热轧、热轧退火和冷轧退火的 6Si 样品（即 6SiWR、6SiWRA 和 6SiCRA）。0SiHRA 显示出板结型，6SiWR 显示出拉长型，而 6SiWRA 和 6SiCRA 则显示出等轴型微观结构。与 0SiHRA 相比，6Si 样品的机械性能和抗氢脆（HE）性能普遍提高。0SiHRA 中的氢致裂纹（HIC）主要在γ(α′)/α界面处成核，并沿先奥氏体晶界扩展，扩展阻力很小，因此显示出较低的抗氢脆性。6SiWR 和 6SiWRA 中的 HIC 在γ(α′)/α 和 (γ(α′)+α)/δ 接口处成核并纵向扩展。随后，6WR 的细长微结构撕裂和 6SiWRA 的等轴晶粒间断裂导致 HIC 横向扩展。6SiWR 和 6SiWRA 的断裂行为消耗了大量能量，从而增强了抗高热性能。这项研究为轧制技术和微结构设计提供了重要启示，从而提高了高强度中锰钢的机械性能和抗高热冲击性能。

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.