Superhigh strength and ductile press-hardening steel produced by shortened austenitization of microstructure containing Mn/Cr-rich cementite particles

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2024-10-30 DOI:10.1016/j.scriptamat.2024.116435

Cancan Ding , Chengyuan Deng , Qinyi Guo , Zhipeng Liu , Ru Ge , Bin Hu , Shilei Li , Haiwen Luo

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Abstract

We developed a novel Si/Cr-alloyed martensitic press-hardening steel (PHS), which has ultimate tensile strength (UTS) of 2280 MPa and total elongation (TE) of 10.9 % after a short hot-forming process, far superior to the present 22MnB5 PHS. Such an unprecedented mechanical combination is primarily attributed to the sufficient retained austenite (RA) grains with evenly distributed mechanical stabilities, which is realized by dissolving nearly 50 % volume percentage of Mn/Cr-rich cementite particles during the short soaking with the guidance of the numerical simulations. As a result, some RA grains have the C/Mn/Cr-enriched cores and other have the cementite cores that are neighbored with high C/Mn/Cr concentrations and steep gradients. This leads to the great heterogeneity in the mechanical stabilities of RA grains in a wide range so that these RA grains are able to provide a continuous TRIP effect for sustainably enhanced work hardening during deformation.

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通过对含有富 Mn/Cr 雪明碳铁颗粒的微观结构进行短时奥氏体化生产超高强度和韧性压淬钢

我们开发了一种新型 Si/Cr 合金马氏体压淬钢 (PHS)，经过短期热成型工艺后，其极限抗拉强度 (UTS) 达 2280 兆帕，总伸长率 (TE) 达 10.9%，远远优于目前的 22MnB5 PHS。这种前所未有的机械性能组合主要归功于具有均匀分布机械稳定性的足够保留奥氏体（RA）晶粒，这是在数值模拟的指导下，通过在短时间浸泡过程中溶解近 50% 体积百分比的富锰/铬雪明碳酸盐颗粒而实现的。因此，一些 RA 晶粒具有富含 C/Mn/Cr 的核心，而另一些则具有与高 C/Mn/Cr 浓度和陡峭梯度相邻的雪明碳酸盐核心。这导致 RA 晶粒的机械稳定性在很大范围内存在很大的异质性，因此这些 RA 晶粒能够提供持续的 TRIP 效应，从而在变形过程中持续增强加工硬化。

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

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.