一种析出强化型Fe-C-Mn-Ni奥氏体合金钢的微观组织和力学性能
Microstructure and Mechanical Properties of a Precipitate-HardenedFe-C-Mn-Ni Austenitic Alloy Steel
摘 要
对Fe-C-Mn-Ni-X（X为铬、钒等元素）奥氏体合金钢锻材进行固溶和时效处理，研究了时效温度（650，700，750 ℃）和时效时间（0~25 h）对合金钢显微组织与力学性能的影响。结果表明：固溶态和时效态合金钢显微组织形态相差不大，时效处理后，合金钢中析出大量与奥氏体基体呈共格或半共格位向关系的纳米VC相；固溶态合金钢表现出很强的时效硬化能力，随时效温度升高，硬度达到峰值的时间缩短，峰值硬度降低；时效处理后，合金钢的屈服强度和抗拉强度显著增加，断后伸长率和加工硬化指数则明显下降，拉伸失效模式由韧性断裂转变为韧脆混合断裂；随时效温度升高和时效时间延长，合金钢的强度有所降低，但加工硬化能力增强。
固溶处理
时效硬化
析出强化
austenitic alloy steel
solution treatment
age hardening
precipitation hardening
Abstract
Fe-C-Mn-Ni-X (where X stands for Cr, V, etc.) austenitic alloy steel forgings were solid solution and aging treated. The effects of aging temperature (650, 700, 750 ℃) and aging time (0-25 h) on the microstructure and mechanical properties of the alloy steel were studied. The results show that the microstructure of solid solution treated and aging treated steels were similar. After aging treatment, a large amount of nano-VC phases in co-lattice or semi-co-lattice orientation with the austenite matrix were precipitated in the alloy steel. The solid solution treated alloy steel showed a strong age hardening capability, the aging time to reach the peak hardness was shorted with increasing aging temperature, and the peak hardness decreased. After aging treatment, the yield strength and tensile strength of the alloy steel increased significantly, the elongation and work hardening index decreased, and the tensile failure mode changed from ductile fracture to ductile-brittle mixed fracture. With the aging temperature increasing and the aging time extending, the strength of the alloy steel was reduced, but the work hardening ability was enhanced.
中图分类号 TG142.1 DOI 10.11973/jxgccl202008012
所属栏目 材料性能及应用
基金项目
收稿日期 2020/3/6
修改稿日期 2020/6/29
网络出版日期
作者单位点击查看
备注卜林森(1994-),男,江苏淮安人,硕士研究生
引用该论文: BU Linsen,WANG Min,HAO Qingguo,YANG Qi,LI Wei. Microstructure and Mechanical Properties of a Precipitate-HardenedFe-C-Mn-Ni Austenitic Alloy Steel[J]. Materials for mechancial engineering, 2020, 44(8): 57～62
卜林森,王敏,郝庆国,杨旗,李伟. 一种析出强化型Fe-C-Mn-Ni奥氏体合金钢的微观组织和力学性能[J]. 机械工程材料, 2020, 44(8): 57～62
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【7】丁桦,杨平.高锰TRIP/TWIP钢变形行为的研究进展[J].材料与冶金学报,2010,9(4):265-272.
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【11】SOLENTHALER C,RAMESH M,UGGOWITZER P J,et al.Precipitation strengthening of Nb-stabilized TP347 austenitic steel by a dispersion of secondary Nb(C,N) formed upon a short-term hardening heat treatment[J].Materials Science and Engineering:A,2015,647:294-302.
【12】CHI C Y,YU H Y,DONG J X,et al.The precipitation strengthening behavior of Cu-rich phase in Nb contained advanced Fe-Cr-Ni type austenitic heat resistant steel for USC power plant application[J].Progress in Natural Science:Materials International, 2012,22(3):175-185.
【13】SAGARADZE V V,KOSITSYNA I I,MUKHIN M L,et al.High-strength precipitation-hardening austenitic Fe-Mn-V-Mo-C steels with shape memory effect[J].Materials Science and Engineering:A, 2008,481/482:747-751.
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