Effect of Solution Temperature on Microstructure and Mechanical Properties of Fe-20Mn-9Al-1.2C Low-Density Steel

doi:10.12068/j.issn.1005-3026.2023.05.001

Abstract

Abstract: To obtain an excellent combination of strength and toughness， a new heat treatment route of low-density Fe-20Mn-9Al-1.2C steel was designed. After smelting， forging and hot rolling， the steel was treated by solid solution at 900， 950， 1000 and 1050℃， respectively for 24min and a water quenching afterward. The effect of solid solution temperature on microstructure and mechanical property of the tested steel was studied by OM， SEM， XRD， EMPA and other methods. The results show that the density of the steel is 6.826 g/cm³， which is about 13% lower than the conventional one. When the solid solution temperature is 1000℃， the comprehensive mechanical properties of the steel are the best with the tensile strength of 1065MPa， yield strength of 937MPa， elongation of 65.3%， strong strength-ductility product of 69.5 GPa·%， and impact energy(V-notch) at-40℃ of 49 J， respectively.

Key words: Fe-Mn-Al-C low-density steel； solution temperature； к-carbides； microstructure； mechanical property

CLC Number:

TP000

WANG Hai-tao， LI Jia-dong， DENG Xiang-tao， WANG Zhao-dong. Effect of Solution Temperature on Microstructure and Mechanical Properties of Fe-20Mn-9Al-1.2C Low-Density Steel[J]. Journal of Northeastern University(Natural Science), 2023, 44(5): 609-616.

References

[1]Cheng W C，Cheng C Y，Hsu C W，et al.Phase transformation of the L12 phase to κ-carbide after spinodal decomposition and ordering in an Fe-C-Mn-Al austenitic steel［J］.Materials Science and Engineering:A，2015，642:128-135.
[2]Kim H，Suh D W，Kim N J.Fe-Al-Mn-C lightweight structural alloys:a review on the microstructures and mechanical properties［J］.Science and Technology of Aadvanced Materials，2013，14(1):014205.
[3]马涛，李慧蓉，高建新，等.Fe-Mn-Al-C低密度钢强化机制与拉伸性能研究进展及Nb微合金化展望［J］.材料导报，2020，34(23):23154-23164.(Ma Tao，Li Hui-rong，Gao Jian-xin，et al.Research progress on strengthening mechanism and tensile properties of Fe-Mn-Al-C low density steel and prospect of Nb microalloying［J］.Materials Review，2020，34(23):23154-23164.)
[4]Burja J，etina B B，Balako T.κ-carbide precipitation in duplex Fe-Al-Mn-Ni-C low-density steel［J］.Crystals，2021，11(10):1261-1263.
[5]Ding H，Han D，Zhang J，et al.Tensile deformation behavior analysis of low density Fe-18Mn-10Al-xC steels［J］.Materials Science and Engineering:A，2016，652:69-76.
[6]Zambrano O A.A general perspective of Fe-Mn-Al-C steels［J］.Journal of Materials Science，2018，53(20):14003-14062.
[7]Li Z，Wang Y，Cheng X，et al.The effect of rolling and subsequent aging on microstructures and tensile properties of a Fe-Mn-Al-C austenitic steel［J］.Materials Science and Engineering:A，2021，822:141683.
[8]Song W，Zhang W，von Appen J，et al.κ-phase formation in Fe-Mn-Al-C austenitic steels［J］.Steel Research International，2015，86(10):1161-1169.
[9]高志喆，程福超，冯一帆，等.时效时间对低密度超高锰铸钢组织性能的影响［J］.金属热处理，2021，46(8):115-120.(Gao Zhi-zhe，Cheng Fu-chao，Feng Yi-fan et al.Effect of aging time on microstructure and properties of low density ultra-high manganese cast steel［J］.Heat Treatment of Metals，2021，46(8):115-120.)
[10]Sutou Y，Kamiya N，Umino R，et al.High-strength Fe-20Mn-Al-C-based alloys with low density［J］.ISIJ International，2010，50(6):893-899.
[11]Liu P P，Zhao M Z，Zhu Y M，et al.Effects of carbide precipitate on the mechanical properties and irradiation behavior of the low activation martensitic steel［J］.Journal of Alloys and Compounds，2013，579:599-605.
[12]Chen S，Rana R，Haldar A，et al.Current state of Fe-Mn-Al-C low density steels［J］.Progress in Materials Science，2017，89:345-391.
[13]章小峰，李家星，万亚雄，等.低密度钢中有序析出相的研究进展［J］.材料导报，2019，33(23):3979-3989.(Zhang Xiao-feng，Li Jia-xing，Wan Ya-xiong.Research progress of ordered precipitates in low density steel［J］.Materials Reports，2019，33(23):3979-3989.)
[14]刘春泉，彭其春，薛正良，等.Fe-Mn-Al-C系列低密度高强钢的研究现状［J］.材料导报，2019，33(15):2572-2581.(Liu Chun-quan，Peng Qi-chun，Xue Zheng-liang，et al.Research status of Fe-Mn-Al-C low density and high strength steels［J］.Materials Reports，2019，33(15):2572-2581.)
[15]Wu Z Q，Ding H，Li H Y，et al.Microstructural evolution and strain hardening behavior during plastic deformation of Fe-12Mn-8Al-0.8C steel［J］.Materials Science and Engineering:A，2013，584:150-155.
[16]Zhao C，Song R，Zhang L，et al.Effect of annealing temperature on the microstructure and tensile properties of Fe-10Mn-10Al-0.7 C low-density steel［J］.Materials & Design，2016，91:348-360.
[17]刘少尊，厉勇，王春旭，等.固溶处理对Fe-Mn-Al-C系低密度钢组织与性能的影响［J］.金属热处理，2015，40(9):120-124.(Liu Shao-zun，Li Yong，Wang Chun-xu，et al.Effect of solution treatment on microstructure and properties of Fe-Mn-Al-C low density steel［J］.Heat Treatment of Metals，2015，40(9):120-124.)
[18]Meyers M A，Chawla K K.Mechanical behavior of materials［M］.Cambridge:Cambridge University Press，2008.