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热处理工艺对Fe-25Mn-18Cr-3.5Ni-2Al力学与耐蚀性能影响

曾泽瑶

曾泽瑶. 热处理工艺对Fe-25Mn-18Cr-3.5Ni-2Al力学与耐蚀性能影响[J]. 钢铁钒钛, 2022, 43(5): 158-165. doi: 10.7513/j.issn.1004-7638.2022.05.023
引用本文: 曾泽瑶. 热处理工艺对Fe-25Mn-18Cr-3.5Ni-2Al力学与耐蚀性能影响[J]. 钢铁钒钛, 2022, 43(5): 158-165. doi: 10.7513/j.issn.1004-7638.2022.05.023
Zeng Zeyao. Effect of heat treatment on mechanical and corrosion resistance properties of Fe-25Mn-18Cr-3.5Ni-2Al stainless steel[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 158-165. doi: 10.7513/j.issn.1004-7638.2022.05.023
Citation: Zeng Zeyao. Effect of heat treatment on mechanical and corrosion resistance properties of Fe-25Mn-18Cr-3.5Ni-2Al stainless steel[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 158-165. doi: 10.7513/j.issn.1004-7638.2022.05.023

热处理工艺对Fe-25Mn-18Cr-3.5Ni-2Al力学与耐蚀性能影响

doi: 10.7513/j.issn.1004-7638.2022.05.023
详细信息
    作者简介:

    曾泽瑶,1995年出生,男,硕士,助理工程师,研究方向:不锈钢强韧化与耐蚀性能研究,E-mail: zeyao_zeng@163.com

  • 中图分类号: TF76

Effect of heat treatment on mechanical and corrosion resistance properties of Fe-25Mn-18Cr-3.5Ni-2Al stainless steel

  • 摘要: 采用拉伸、冲击和电化学测试方法研究了Fe-25Mn-18Cr-3.5Ni-2Al试验钢不同热处理工艺下的性能,通过SEM,EBSD和XRD等分析表明:奥氏体相体积分数随着固溶温度升高逐渐下降,900、950、1000 ℃固溶后,EBSD分析奥氏体相体积分数依次降低至60.2%,48.7%和20.0%,奥氏体由尖锐的鱼骨状转变为孤立的长针状分布在铁素体晶界上,铁素体相含量上升,试验钢的强度、硬度增加,冲击韧性下降,在900~1000 ℃固溶处理后铁素体相含量依次增大,(001)bcc取向逐渐减弱。经过700 ℃回火后易于在α相内出现弥散分布的NiAl纳米颗粒,导致脆性断裂。极化测试得到点蚀电位随固溶温度升高逐渐正移,1000 ℃固溶处理试样在3.5%NaCl极化测试中出现较长的钝化区和二次钝化,Ecorr=−257 mV,Eb=−46.5 mV,兼具较好耐蚀性能与力学性能,推荐作为实际生产热处理温度。
  • 图  1  析出相含量-温度变化

    Figure  1.  Temperature dependence of precipitate phase content

    图  2  不同固溶温度下力学性能趋势

    (a)工程应力应变曲线;(b)冲击韧性;(c)硬度(HB)

    Figure  2.  The trend of mechanical properties at different solution temperatures

    图  3  XRD衍射图谱

    (a)固溶态;(b)第二相颗粒

    Figure  3.  XRD diffraction pattern (a) solid solution, (b) second phase particles analysis

    图  4  固溶态组织金相照片

    Figure  4.  Metallographic photos of solid solution based microstructure

    (a) 900 ℃;(b) 950 ℃;(c) 1 000 ℃

    图  5  试验料不同固溶温度处理后EBSD测试相比例与取向成像

    Figure  5.  EBSD analyze phase propotion maps and orientation maps

    (a)、(d) 900 ℃;(b)、(e) 950 ℃;(c)、(f) 1 000 ℃

    图  6  不同固溶温度处理后试样的冲击断口形貌及EDS

    (a)锻态;(b) 900 ℃固溶;(c) 950 ℃固溶;(d) 1 050 ℃固溶; (e)、(f) EDS谱图

    Figure  6.  Impact fracture morphology and EDS pictures

    图  7  回火态应力-应变曲线(a) 及XRD分析(b)

    Figure  7.  Tempering state stress-strain curves (a), XRD diffraction patterns (b)

    图  8  回火处理后试样SEM组织形貌及其EDS

    (a) 500 ℃回火;(b) 600 ℃回火;(c) 700 ℃回火 ;(d) 700 ℃回火局部放大区域;(e)、(f) EDS结果

    Figure  8.  The state microstructures of tempering treatment

    图  9  不同固溶温度下极化曲线及其测试后SEM形貌

    Figure  9.  Polarization curves at different solution temperatures and corrosion test SEM pictures

    (a)、(d) 900 ℃;(b)、(e) 950 ℃;(c)、(f) 1 000 ℃

    表  1  试验钢化学成分

    Table  1.   Chemical composition of tested steel %

    CCrMnSiNiAlPSFe
    0.02217.8925.830.233.52.060.0060.003余量
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-11-01
  • 刊出日期:  2022-11-01

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