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淬火-配分（Q&P）及超声表面滚压（USR）工艺对高强度马氏体钢组织与力学性能的研究

Study of Quenching and Partitioning (Q&P) and Ultrasonic Surface Rolling (USR) Process on Microstructure and Mechanical Property of a High-Strength Martensitic Steel.

作者信息

Hou Yi, Duan Chenfeng, Li Xiaoqiang, Qu Shengguan

机构信息

National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, Guangzhou 510640, China.

School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China.

出版信息

Materials (Basel). 2024 Jun 5;17(11):2752. doi: 10.3390/ma17112752.

DOI:10.3390/ma17112752
PMID:38894015
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11173688/
Abstract

Steel with a combination of strength and plasticity is prevalently demanded for lightweight design and emission reductions in manufacturing. In this study, a high-strength Cr-Ni-Mo martensitic steel treated by quenching and partitioning (Q&P) and ultrasonic surface rolling (USR) processes was studied for both strength and plasticity enhancement. Specimens were austenitized at 850 °C and then quenched to 240 °C via cooling by water, oil, and normalization in quenching. This was followed by partitioning, in which two groups of specimens were heated to 370 °C and 350 °C for 45 min, respectively. At last, all the specimens were quenched to room temperature with the same methods of quenching. The highest tensile strength increased from 681.73 MPa to 1389.76 MPa when compared to as-received (AR) steel after the Q&P process. The USR process with a static force of 800 N further improved the tensile strength of specimens with high tensile strength after the Q&P process, which improved from 1389.76 MPa to 1586.62 MPa and the product's strength and elongation (PSE) increased from 15.76 GPa% to 15.9 GPa%, while the total elongation showed a mitigatory decrease from 11.34% to 10.02%. Tensile fractures were also studied and verified using a combination of strength and plasticity after a combined process of Q&P and USR.

摘要

在制造业中，兼具强度和塑性的钢材对于轻量化设计和减排至关重要。本研究中，对一种经过淬火配分（Q&P）和超声表面滚压（USR）处理的高强度Cr-Ni-Mo马氏体钢进行了强度和塑性增强研究。试样在850℃进行奥氏体化，然后通过水淬、油淬和淬火正火冷却至240℃。随后进行配分，两组试样分别加热至370℃和350℃并保持45分钟。最后，所有试样采用相同的淬火方法冷却至室温。与原始态（AR）钢相比，Q&P处理后最高抗拉强度从681.73MPa提高到1389.76MPa。在Q&P处理后的高抗拉强度试样上，施加800N静力的USR工艺进一步提高了抗拉强度，从1389.76MPa提高到1586.62MPa，产品强度和伸长率（PSE）从15.76GPa%提高到15.9GPa%，而总伸长率略有下降，从11.34%降至10.02%。还结合Q&P和USR联合工艺后的强度和塑性对拉伸断口进行了研究和验证。

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