低碳钢铁素体相变析出行为
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摘要
利用高温淬火相变仪测定了EH40级船板钢晶内铁素体的相变温度区间,又利用高温共聚焦显微镜对晶内针状铁素体的相变析出行为进行了原位观察。结果表明:能得到针状铁素体的最佳降温速率为10℃/s,升温过程中奥氏体开始相变温度Ac_1=743℃,降温过程中奥氏体结束相变温度Ar_1=546℃;针状铁素体的生长过程伴随着加速和减速现象;观察到针状铁素体的3种形核方式,分别为夹杂物诱导形核、在奥氏体晶界上感生形核析出以及在晶界铁素体上感生形核析出。最后揭示了从铁素体析出生长到形成连锁组织的作用机理。
The phase transition temperature range of intragranular ferrite in EH40 grade ship steel was measured by high temperature quenching phase change instrument. The phase change precipitation behavior of intragranular acicular ferrite was observed with the way of insitu by using high temperature confocal microscopy. The results show that the optimum cooling rate of acicular ferrite is 10 ℃/s,the austenite begins to change phase during heated is Ac_1= 743 ℃,and the austenite finish phase transition temperature during cooling is Ar_1=546 ℃. The growth process of acicular ferrite is accompanied by acceleration and deceleration,and three nucleation modes of acicular ferrite are observed,which are inclusion-induced nucleation,nucleation induced on the austenite grain boundary,nucleation induced on the ferrite grain boundary, respectively. Finally, the mechanism from the precipitation and growth of ferrite to the formation of interlocking microstructure is revealed.
The phase transition temperature range of intragranular ferrite in EH40 grade ship steel was measured by high temperature quenching phase change instrument. The phase change precipitation behavior of intragranular acicular ferrite was observed with the way of insitu by using high temperature confocal microscopy. The results show that the optimum cooling rate of acicular ferrite is 10 ℃/s,the austenite begins to change phase during heated is Ac_1= 743 ℃,and the austenite finish phase transition temperature during cooling is Ar_1=546 ℃. The growth process of acicular ferrite is accompanied by acceleration and deceleration,and three nucleation modes of acicular ferrite are observed,which are inclusion-induced nucleation,nucleation induced on the austenite grain boundary,nucleation induced on the ferrite grain boundary, respectively. Finally, the mechanism from the precipitation and growth of ferrite to the formation of interlocking microstructure is revealed.
引文
[1]尚成嘉,胡良均,杨善武.低碳微合金钢中针状铁素体的形成与控制[J].金属学报,2005,41(5):471-476.Shang Chengjia,Hu Liangjun,Yang Shanwu.Forming and controlling of the acicular ferrite in low carbon microalloyed steel[J].Acta Metallrugica Sinica,2005,41(5):471-476.
[2]梁冬梅,朱远志,周立新.钢中针状铁素体及其非均匀形核机制[J].金属热处理,2011,36(12):105-111.Liang Dongmei,Zhu Yuanzhi,Zhou Lixin.Acicular ferrite and its heterogeneous nucleation mechanism in steels[J].Heat Treatment of Metals,2011,36(12):105-111.
[3]赖朝彬,赵青松,谭秀珍,等.晶内铁素体及其组织控制技术研究概况[J].有色金属科学与工程,2014,5(6):53-60.Lai Chaobin,Zhao Qingsong,Tan Xiuzhen,et al.Review of intragranular ferrite and its microstructure control technologies[J].Nonferrous Metals Science and Engineering,2014,5(6):53-60.
[4]杨杰,李春福,申文竹.针状铁素体形成的研究现状及应用前景[J].金属热处理,2013,38(2):21-25.Yang Jie,Li Chunfu,Shen Wenzhu.Research status and application prospect of formation of acicular ferrite[J].Heat Treatment of Metals,2013,38(2):21-25.
[5]杨忠民,赵燕,王瑞珍,等.普通低碳钢形变诱导铁素体晶内和晶界的析出行为[J].金属热处理,2001,26(2):5-7.Yang Zhongmin,Zhao Yan,Wang Ruizhen,et al.Precipitation behavior of ferrite in grain and in grain boundary induced by deformation[J].Heat Treatment of Metals,2001,26(2):5-7.
[6]万响亮,李光强,吴开明.原位观察Ti N粒子对低合金高强度钢模拟焊接热影响区粗晶区晶粒细化作用[J].工程科学学报,2016,38(3):371-378.Wan Xiangliang,Li Gaungquang,Wu Kaiming.In-situ observations of grain refinement by Ti N particles in the simulated coarse-grained heataffected zone of a high-strength low-alloy steel[J].Chinese Journal of Engineering,2016,38(3):371-378.
[7]方园,梁高飞,朱光明,等.共焦激光扫描显微镜及其在钢铁相变原位观察中的应用[J].宝钢技术,2006(6):64-69.Fang Yuan,Liang Gaofei,Zhu Guangming,et al.Confocal laser scanning microscopy and its application in in-situ observation of phase transformation of steel[J].Baosteel Technology,2006(6):64-69.
[8]Eichen E,Aaronson H I,Pound G M,et al.Thermionic emission microscope study of the formation of ferrite sideplates[J].Acta Metallurgica,1964,12(11):1298-1301.
[9]Onink M,Tichelaar F D,Brakman C M,et al.An in situ,hot stage transmission electron microscopy study of the decomposition of Fe-Caustenites[J].Journal of Materials Science,1995,30(24):6223-6234.
[10]Krielaart G P,Sietsma J,Zwaag S V D.Ferrite formation in Fe-C alloys during austenite decomposition under non-equilibrium interface conditions[J].Materials Science and Engineering A,1997,237(2):216-223.
[2]梁冬梅,朱远志,周立新.钢中针状铁素体及其非均匀形核机制[J].金属热处理,2011,36(12):105-111.Liang Dongmei,Zhu Yuanzhi,Zhou Lixin.Acicular ferrite and its heterogeneous nucleation mechanism in steels[J].Heat Treatment of Metals,2011,36(12):105-111.
[3]赖朝彬,赵青松,谭秀珍,等.晶内铁素体及其组织控制技术研究概况[J].有色金属科学与工程,2014,5(6):53-60.Lai Chaobin,Zhao Qingsong,Tan Xiuzhen,et al.Review of intragranular ferrite and its microstructure control technologies[J].Nonferrous Metals Science and Engineering,2014,5(6):53-60.
[4]杨杰,李春福,申文竹.针状铁素体形成的研究现状及应用前景[J].金属热处理,2013,38(2):21-25.Yang Jie,Li Chunfu,Shen Wenzhu.Research status and application prospect of formation of acicular ferrite[J].Heat Treatment of Metals,2013,38(2):21-25.
[5]杨忠民,赵燕,王瑞珍,等.普通低碳钢形变诱导铁素体晶内和晶界的析出行为[J].金属热处理,2001,26(2):5-7.Yang Zhongmin,Zhao Yan,Wang Ruizhen,et al.Precipitation behavior of ferrite in grain and in grain boundary induced by deformation[J].Heat Treatment of Metals,2001,26(2):5-7.
[6]万响亮,李光强,吴开明.原位观察Ti N粒子对低合金高强度钢模拟焊接热影响区粗晶区晶粒细化作用[J].工程科学学报,2016,38(3):371-378.Wan Xiangliang,Li Gaungquang,Wu Kaiming.In-situ observations of grain refinement by Ti N particles in the simulated coarse-grained heataffected zone of a high-strength low-alloy steel[J].Chinese Journal of Engineering,2016,38(3):371-378.
[7]方园,梁高飞,朱光明,等.共焦激光扫描显微镜及其在钢铁相变原位观察中的应用[J].宝钢技术,2006(6):64-69.Fang Yuan,Liang Gaofei,Zhu Guangming,et al.Confocal laser scanning microscopy and its application in in-situ observation of phase transformation of steel[J].Baosteel Technology,2006(6):64-69.
[8]Eichen E,Aaronson H I,Pound G M,et al.Thermionic emission microscope study of the formation of ferrite sideplates[J].Acta Metallurgica,1964,12(11):1298-1301.
[9]Onink M,Tichelaar F D,Brakman C M,et al.An in situ,hot stage transmission electron microscopy study of the decomposition of Fe-Caustenites[J].Journal of Materials Science,1995,30(24):6223-6234.
[10]Krielaart G P,Sietsma J,Zwaag S V D.Ferrite formation in Fe-C alloys during austenite decomposition under non-equilibrium interface conditions[J].Materials Science and Engineering A,1997,237(2):216-223.