23C6和Chi相。在900~1000℃范圍內(nèi)生成Sigma相,Sigma相會提高基體硬度。Sigma相主要由殘余δ鐵素體分解生成, {001}<110>和{001}<100>取向的δ鐵素體優(yōu)先向Sigma相轉(zhuǎn)變。且隨著溫度的升高,Sigma含量降低,奧氏體平均晶粒尺寸增加,硬度呈逐漸下降趨勢。固溶溫度超過1050℃后,Sigma相完全固溶進(jìn)奧氏體中,奧氏體平均晶粒尺寸顯著長大,硬度值快速降低,殘余鐵素體中{001}<110>和{001}<100>織構(gòu)重新增強。1100℃固溶處理后,殘余鐵素體含量降低至0.2%。"/>

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固溶溫度對奧氏體不銹鋼δ鐵素體轉(zhuǎn)變的影響
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1.常熟理工學(xué)院;2.桂林航天工業(yè)學(xué)院

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江蘇省高等學(xué)校自然科學(xué)研究重大項目(項目號18KJA460001)


Effect of solution temperature on transformation of δ-ferrite in austenitic stainless steel
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1.School of Automotive Engineering,Changshu Institute of Technology;2.School of Mechanical Engineering,Guilin University of Aerospace Technology

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    摘要:

    本文對含有殘余鐵素體的奧氏體不銹鋼進(jìn)行不同溫度的固溶處理,使用SEM、EBSD、TEM和顯微硬度等技術(shù)分析試驗樣品的微觀組織、織構(gòu)和析出相。結(jié)果表明：奧氏體不銹鋼在900~1100℃固溶處理30min后水淬,存在奧氏體、鐵素體和Sigma三相,未發(fā)現(xiàn)M23C6和Chi相。在900~1000℃范圍內(nèi)生成Sigma相,Sigma相會提高基體硬度。Sigma相主要由殘余δ鐵素體分解生成, {001}<110>和{001}<100>取向的δ鐵素體優(yōu)先向Sigma相轉(zhuǎn)變。且隨著溫度的升高,Sigma含量降低,奧氏體平均晶粒尺寸增加,硬度呈逐漸下降趨勢。固溶溫度超過1050℃后,Sigma相完全固溶進(jìn)奧氏體中,奧氏體平均晶粒尺寸顯著長大,硬度值快速降低,殘余鐵素體中{001}<110>和{001}<100>織構(gòu)重新增強。1100℃固溶處理后,殘余鐵素體含量降低至0.2%。

    Abstract:

    The austenitic stainless steel samples containing residual δ ferrite were solution treated at different temperatures. The SEM, EBSD, TEM and hardness tester were applied to investigate the microstructure, texture, hardness and precipitate phase characterization of the experimental samples. The results show that there are three phases of austenite, ferrite and sigma in austenitic stainless steel after solution treatment at 900~1100℃ for 30min. M23C6 and Chi phase are not found. The sigma phase forms in the range of 900~1000℃, which also enhances the hardness of the matrix. Sigma phase is mainly formed by decomposition of residual δ ferrite. The {001}<110> and {001}<100> oriented δ ferrite preferentially transforms to sigma phase. With the increase of temperature, the content of sigma decreases, the average grain size of austenite increases, and the hardness decreases gradually. After 1050℃, sigma phase is completely dissolved into austenite, and the average grain size of austenite grows significantly. This results into the hardness decreases rapidly. Meanwhile,{001}<110> and {001}<100> textures of δ ferrite were re-enhanced。After solution treatment at 1100℃, the content of residual δ ferrite decreased to 0.2%.

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許峰,楊莉,鄧長春,肖穎,徐虎,張堯成.固溶溫度對奧氏體不銹鋼δ鐵素體轉(zhuǎn)變的影響[J].稀有金屬材料與工程,2021,50(8):2921~2926.[Xu Feng, Yang Li, Deng Changchun, Xiao Ying, Xu hu, Zhang Yaocheng. Effect of solution temperature on transformation of δ-ferrite in austenitic stainless steel[J]. Rare Metal Materials and Engineering,2021,50(8):2921~2926.]
DOI：10.12442/j. issn.1002-185X.20200664

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  • 收稿日期:2020-09-02
  • 最后修改日期:2020-09-28
  • 錄用日期:2020-10-21
  • 在線發(fā)布日期: 2021-09-07
  • 出版日期: 2021-08-31