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<p>Through quench partitioning (Q&amp;P) processing, austenite was stabilized in the microstructure of martensitic stainless steel. The consequence of partitioning temperature and nitrogen level on the austenite phase fraction, hardness, and microstructure has been meticulously examined. Field emission scanning electron microscopy (FESEM) analysis revealed that the microstructure of quenched partitioned specimens primarily consists of martensite and ferrite, with a fine dispersed region of austenite also observed. The x-ray diffraction (XRD) analysis revealed that as the partitioning temperature increased from 370 to 450&#xa0;°C, the maximum fraction of untransformed austenite decreased to 3.5 and 5.5% for samples containing 0.005 and 0.13% nitrogen, respectively. Furthermore, with the increase in nitrogen level, the proportion of stabilized austenite rose to 7.8 and 5.5% in treated samples partitioned at 370 and 450&#xa0;°C, respectively. The XRD analysis revealed that the optimal partitioning temperature for maximizing the proportion of untransformed austenite in Q&amp;P nitrogen-alloyed martensitic stainless steel is 370&#xa0;°C. The study further demonstrated that the maximum proportion of untransformed austenite attained under the specified experimental conditions was approximately 8%. Energy-dispersive x-ray spectroscopy (EDS) analysis results showed a uniform distribution of nitrogen and carbon components in the microstructure, with some areas exhibiting an accumulation of nitrogen and carbon elements. The hardness test findings demonstrated that at specific nitrogen levels of 0.005% and 0.13%, the hardness values for quenched partitioned samples increased to 320 and 360 HB, respectively, as the partitioning temperature was elevated from 370 to 450&#xa0;°C.</p> Graphical Abstract <p></p>

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Influence of Partitioning Temperature on Microstructure and Hardness of Quenching and Partitioning Nitrogen-Alloyed Martensitic Stainless Steel

  • 期刊论文

  • 发表日期：

    2025年1月20日

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  • Ahmad Nazari,
  • Behrooz Ghasemi

摘要

Through quench partitioning (Q&P) processing, austenite was stabilized in the microstructure of martensitic stainless steel. The consequence of partitioning temperature and nitrogen level on the austenite phase fraction, hardness, and microstructure has been meticulously examined. Field emission scanning electron microscopy (FESEM) analysis revealed that the microstructure of quenched partitioned specimens primarily consists of martensite and ferrite, with a fine dispersed region of austenite also observed. The x-ray diffraction (XRD) analysis revealed that as the partitioning temperature increased from 370 to 450 °C, the maximum fraction of untransformed austenite decreased to 3.5 and 5.5% for samples containing 0.005 and 0.13% nitrogen, respectively. Furthermore, with the increase in nitrogen level, the proportion of stabilized austenite rose to 7.8 and 5.5% in treated samples partitioned at 370 and 450 °C, respectively. The XRD analysis revealed that the optimal partitioning temperature for maximizing the proportion of untransformed austenite in Q&P nitrogen-alloyed martensitic stainless steel is 370 °C. The study further demonstrated that the maximum proportion of untransformed austenite attained under the specified experimental conditions was approximately 8%. Energy-dispersive x-ray spectroscopy (EDS) analysis results showed a uniform distribution of nitrogen and carbon components in the microstructure, with some areas exhibiting an accumulation of nitrogen and carbon elements. The hardness test findings demonstrated that at specific nitrogen levels of 0.005% and 0.13%, the hardness values for quenched partitioned samples increased to 320 and 360 HB, respectively, as the partitioning temperature was elevated from 370 to 450 °C.

Graphical Abstract