Effect of High-pressure Quenching on Pure-iron Martensite Transformation and Its Strengthening Mechanism

Qing CUI; Xiaoping LIN; Bin WEN

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Effect of High-pressure Quenching on Pure-iron Martensite Transformation and Its Strengthening Mechanism

机译：Effect of High-pressure Quenching on Pure-iron Martensite Transformation and Its Strengthening Mechanism

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Industrial pure iron samples were austenitized and quenched (6°C/s cooling to room temperature) under hydrostatic pressure of 3-5 GPa. The morphology, phase transformation and strengthening mechanism of high-pressure quenched martensite are analyzed by the method of SEM, XRD, EBSD, and TEM. Lath martensite with hierarchical packet-block-lath structure is induced in industrial pure iron by high pressure, which keeps the Kurdjumov-Sachs (K-S) orientation relationship with the face-center-cubic (FCC) phase. Pressure refines the size of prior austenite by depressing the mobility of grain boundaries, eading to the decrease of the type of martensite variants. with the increment of pressure, the dislocation density increases gradually (2.04x10~(13) to 3.14x10~(14) m~(-2)) and the martensite blocks are refined from 3.3 to 0.9 μm. In addition, an enormous number of twin boundaries and high-density dislocations are observed in 5 GPa-samples, which is fairly rare in lath martensite of low carbon steels. Superior tensile performances are obtained in industrial pure iron, especially in 5 GPa-sample with ultra-high yield strength of 700 MPa and excellent ductility of 27%. The strengthening mechanism is quantitatively analyzed by Olson's strengthening model, and the results show that both of dislocation strengthening and Hall-Petch strengthening enhances with the increase of pressure. Based on the above findings, martensite transformation can be effectively controlled by hydrostatic pressure, which extends the knowledge into martensitic transformation mechanism and offers a new avenue for developing high performance metal materials.

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来源
《ISIJ International》 |2022年第11期|2374-2381|共8页
作者
Qing CUI; Xiaoping LIN; Bin WEN;
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作者单位

School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning, 110819 China.;

State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004 China.;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类黑色金属材料;
关键词
industrial pure iron; high-pressure quenching; martensite transformation; strengthening mechanism.;

Effect of High-pressure Quenching on Pure-iron Martensite Transformation and Its Strengthening Mechanism

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