Effect of Ni and Cu Alloying on Microstructure and Mechanical Properties of Fe-Mn-Al-C Austenitic Lightweight Steel

doi:10.3901/JME.2024.08.154

Abstract

Abstract: In order to further improve the service performance of Fe-Mn-Al-C high strength steel, the 80Mn20Al5 austenitic lightweight steel is alloyed by Ni and Cu, respectively. The microstructures evolution and mechanical properties of 80Mn20Al5, 80Mn20Al5Ni6 and 80Mn20Al5Cu2 austenitic lightweight steel after solution, cold rolling at 900 ℃ and 1 000 ℃ were contrastive analyzed by electron microscopy, transmission electron microscopy and electron backscattered diffraction. The results show that the three tested steels are single-phase austenite after solution treatment and the average grain size is about 80μm and the tensile properties almost the same. After cold rolling and annealing at 900 ℃, the strength of the three tested steels is improved, while the ductility is basically unchanged. The 80Mn20Al5 steel is single austenite, while the microstructure of 80Mn20Al5Ni6 steel consists of austenite phase and fine B2-AlNi phase. In addition, part of cold deformation morphology is retained and layered mixed crystals are formed. These make it obtain the optimal combination of strength and plasticity. The microstructure of 80Mn20Al5Cu2 steel consist of austenitic phase and dispersed copper-rich phase. The grain size of 80Mn20Al5Cu2 steel is significantly refined to about 8 μm. Both refined grain boundary strengthening and dispersion strengthening of copper-rich can improve the strength and maintain high plasticity of the steel. After cold rolling and annealing at 1 000 ℃, the austenite grains of the three tested steels are also refined while the strength and plasticity increase slightly.

Key words: austenitic lightweight steel, alloying, B2-AlNi phase, copper-rich phase, strength and plasticity

CLC Number:

TG142

YANG Yang, WANG Zekui, CHEN Chen, MA Hua, YANG Zhinan, ZHANG Fucheng. Effect of Ni and Cu Alloying on Microstructure and Mechanical Properties of Fe-Mn-Al-C Austenitic Lightweight Steel[J]. Journal of Mechanical Engineering, 2024, 60(8): 154-164.

References

[1] HAM J L，CAIRNS JR R E. Manganese joins aluminum to give strong stainless[J]. Product Engineering，1958，29(52)：50-51.
[2] GRANATO A，HIKATA A，LÜCKE K. Recovery of damping and modulus changes following plastic deformation[J]. Acta Metallurgica，1958，6(7)：470-480.
[3] ZHANG Zhongwu，LIU Chaintsuan，WANG Xunli，et al. Effects of proton irradiation on nanocluster precipitation in ferritic steel containing fcc alloying additions[J]. Acta Materialia，2012，60(6-7)：3034-3046.
[4] SHRIM D，GAGLIANO M S，FINE M E，et al. Interfacial segregation at Cu-rich precipitates in a high-strength low-carbon steel studied on a sub-nanometer scale[J]. Acta Materialia，2006，54(3)：841-849.
[5] OLIVEIRA S D，TSCHIPTSCHIN A P，PINEDO C E. Simultaneous plasma nitriding and ageing treatments of precipitation hardenable plastic mould steel[J]. Materials & Design，2007，28(5)：1714-1718.
[6] 马华，陈晨，王琳，等. Mo合金化处理对高锰钢磨损行为的影响[J]. 机械工程学报，2020，56(14)：81-90. MA Hua，CHEN Chen，WANG Lin，et al. Effect of Mo alloying on wear behavior of hadfield steel[J]. Journal of Mechanical Engineering，2020，56(14)：81-90.
[7] 杨志南，张福成，张明，等. 高锰钢辙叉机械冲击预硬化工艺研究[J]. 机械工程学报，2011，47(16)：20-24. YANG Zhinan，ZHANG Fucheng，ZHANG Ming，et al. Study on mechanical impact pre-hardening technology of high manganese steel crossing[J]. Journal of Mechanical Engineering，2011，47(16)：20-24.
[8] 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 Xiaofeng，LI Jiaxing，WAN Yaxiong，et al. Research progress of ordered precipitates in low-density steels[J]. Materials Reports，2019，33(23)：3979-3989.
[9] 李大赵，卫英慧，侯利锋，等. 冷轧压下量对TWIP钢组织与性能的影响[J]. 金属热处理，2010，35(5)：63-68. LI Dazhao，WEI Yinghui，HOU Lifeng，et al. Effect of cold reduction on microstructure and properties of twip steel[J]. Heat Treatment of Meta，2010，35(5)：63-68.
[10] 杨富强，宋仁伯，李亚萍，等. 退火温度对冷轧Fe-Mn-Al-C低密度钢性能的影响[J]. 材料研究学报，2015，29(2)：108-114. YANG Fuqiang，SONG Renbo，LI Yaping，et al. Effect of annealing temperature on properties of cold rolled Fe-Mn-Al-C low density steel[J]. Chinese Journal of Materials Research，2015，29(2)：108-114.
[11] GUTIÉRREZ-URRUTIA I，RAABE D. High strength and ductile low density austenitic FeMnAlC steels：Simplex and alloys strengthened by nanoscale ordered carbides[J]. Materials Science and Technology，2014，30(9)：1099-1104.
[12] MISHRA B，SARKAR R，SINGH V，et al. Microstructure and deformation behaviour of austenitic low-density steels：The defining role of B2 intermetallic phase[J]. Materialia，2021，20：101198.
[13] 杨才福，张永权. Cu时效硬化钢中Cu的析出[J]. 钢铁，2005，40(4)：62-65，75. YANG Caifu，ZHANG Yongquan. Cu precipitation in Cu age-hardening steel[J]. Iron and Steel，2005，40(4)：62-65，75.
[14] 王晓姣. Fe-Cu-Ni-Al-Mn钢中强化相复合析出机制的研究[D]. 上海：上海大学，2016. WANG Xiaojiao. Mechanism research of nanoscale composite precipitates in Fe-Cu-Ni-Al-Mn steel[D]. Shanghai：Shanghai University，2016.
[15] 胡小龙，李英龙，刘德罡，等. Fe-12Mn-7Al-0.6C-(V)轻质钢力学行为[J]. 中国冶金，2019，29(2)：39-44. HU Xiaolong，LI Yinglong，LIU Degang，et al. Mechanical behavior of Fe-12Mn-7Al-0.6C-(V) lightweight steels[J]. China Metallurgy，2019，29(2)：39-44.
[16] KIM S H，KIM H，KIM N J. Brittle intermetallic compound makes ultrastrong low-density steel with large ductility[J]. Nature，2015，518(7537)：77-79.
[17] KIM H. Strain hardening of novel high Al low-density steel consisting of austenite matrix and B2-ordered intermetallic second phase in the perspective of non-cell forming face-centered-cubic alloy with high stacking fault energy[J]. Scripta Materialia，2019，160：29-32.
[18] PARK G，NAM C H，ZARGARAN A，et al. Effect of B2 morphology on the mechanical properties of B2-strengthened lightweight steels[J]. Scripta Materialia，2019，165：68-72.
[19] YANG M X，YUAN F P，XIE Q G，et al. Strain hardening in Fe-16Mn-10Al-0.86C-5Ni high specific strength steel[J]. Acta Materialia，2016，109：213-222.
[20] 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 Chunquan，PENG Qichun，XUE Zhengliang，et al. Research situation of Fe-Mn-Al-C system low-density high-strength steel[J]. Materials Reports，2019，33(15)：2572-2581.
[21] 章熙康，王其闵. 金属强度和晶粒大小的关系[J]. 物理通报，1965(4)：145-157. ZHANG Xikang，WANG Qimin. Relationship between metal strength and grain size[J]. Physics Bulletin，1965(4)：145-157.
[22] 康剑梅. Fe-30Mn-0.11C钢的组织结构设计及力学行为的研究[D]. 秦皇岛：燕山大学，2019. KANG Jianmei. Investigation of microstructural design and mechanical behavior for Fe-30Mn-0.11C steel[D]. Qinhuangdao：Yanshan University，2019.
[23] BREUER J，GRÜN A，SOMMER F，et al. Enthalpy of formation of B2-Fe₁-_xAl_x and B2-(Ni，Fe)₁-_xAl_x[J]. Metallurgical and Materials Transactions B，2001，32(5)： 913-918.
[24] CHUMAK I，RICHTER K W，IPSER H. Isothermal sections in the (Fe，Ni)-rich part of the Fe-Ni-Al phase diagram[J]. Journal of Phase Equilibria and Diffusion，2008，29(4)：300-304.
[25] EL-DANAF E，KALIDINDI S R，DOHERTY R D. Influence of deformation path on the strain hardening behavior and microstructure evolution in low sfe fcc metals[J]. International Journal of Plasticity，2001，17(9)：1245-1265.
[26] KALIDINDI S R. Modeling the strain hardening response of low sfe fcc alloys[J]. International Journal of Plasticity，1998，14(12)：1265-1277.
[27] KANG S，JUNG J G，KANG M，et al. The effects of grain size on yielding，strain hardening, and mechanical twinning in Fe-18Mn-0.6C-1.5Al twinning-induced plasticity steel[J]. Materials Science and Engineering：A，2016，652：212-220.
[28] FROMMEYER G，BRÜX U，NEUMANN P. Supra-ductile and high-strength manganese-trip/twip steels for high energy absorption purposes[J]. ISIJ International，2003，43(3)：438-446.
[29] 张昕. Fe-Mn-Si-Al TRIP/TWIP钢组织及性能的研究[D]. 沈阳：东北大学，2009. ZHANG Xin. Deformation microstructure of Fe-Mn-Si-Al trip/twip steels[D]. Shenyang：Northeastern University，2009.