Microstructure evolution and hydrogen embrittlement mechanism of a 2200 MPa press-hardened steel with tempering treatment

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2025-05-01 Epub Date: 2025-03-25 DOI:10.1016/j.matchar.2025.114955

Wei Jian Chen , Zi Yao Wei , Shun Hu Zhang , Ming Kun Ge , Xin Dai , Shun Wu

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Abstract

This study elucidates the coupled enhancement of yield strength and hydrogen embrittlement (HE) resistance in a 2200 MPa press-hardened steel (PHS) through tempering treatments. The results indicate that as the tempering temperature rises, the dislocation density decreases, and the type of precipitated particles changes from needle-like ε-carbides to rod-like η-carbides. Quantitative strengthening mechanism analysis demonstrates that although dislocation strengthening diminishes by 176 MPa after 300 °C tempering, the overall yield strength increases by 186 MPa (reaching 1624 MPa) due to enhanced precipitation strengthening through the interaction between the ε/η-carbides and dislocations. Furthermore, the HE sensitivity of ultra-high strength PHS is governed by the diffusible hydrogen trapped in the dislocations and grain boundaries. Notably, the precipitated particles (semi-coherent (V, Nb)C and ε/η-carbides) effectively suppress both hydrogen-enhanced decohesion (HEDE) and hydrogen-enhanced localized plasticity (HELP) mechanisms by hindering the movement of dislocation‑hydrogen atmospheres. This synergistic effect achieves remarkable HE resistance (fracture strength loss of 1.3 % and displacement loss of 13.2 %) while maintaining ultrahigh strength.

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2200mpa淬火钢回火组织演变及氢脆机理

研究了2200mpa压硬化钢（PHS）回火处理对屈服强度和抗氢脆性能的耦合增强。结果表明：随着回火温度的升高，位错密度减小，析出颗粒类型由针状的ε-碳化物变为棒状的η-碳化物；定量强化机理分析表明，300℃回火后，虽然位错强化降低了176 MPa，但由于ε/η-碳化物与位错的相互作用增强了析出强化，整体屈服强度提高了186 MPa（达到1624 MPa）。此外，超高强度PHS的HE灵敏度受位错和晶界中弥散氢的影响。值得注意的是，析出的颗粒（半相干（V, Nb）C和ε/η-碳化物）通过阻碍位错-氢气氛的运动，有效地抑制了氢增强脱粘（HEDE）和氢增强局部塑性（HELP）机制。这种协同效应在保持超高强度的同时，实现了显著的抗HE性能（断裂强度损失1.3%，位移损失13.2%）。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.