Dynamic mechanical behaviors of high-nitrogen austenitic stainless steel under high temperature and its constitutive model
-
Abstract: Mechanical tests of high-nitrogen austenitic stainless steel (HNS) were performed at strain rates of 102-103 s-1 generated by a split Hopkinson bar apparatus and under different temperatures from 293 K to 873 K. The influences of strain rate and temperature on the plastic flow stress of HNS were analyzed by comparing the dynamic tests with quasi-static tests. The results show that the dynamic mechanical behavior of HNS is significantly sensitive to strain rate and temperature; the flow stress increases rapidly when strain rate exceeds 400 s-1; and at the same strain rate, the flow stress increases as temperature decreases. The coupling effect of strain rate and temperature on the plastic deformation behavior of HNS was investigated. The results indicate that the thermal softening effect plays a key role in the dynamic plastic deformation process of HNS. Based on the classical Johnson-Cook constitutive model, a modified Johnson-Cook constitutive model was given which can describe the dynamic mechanical behavior of HNS properly.摘要: 在293~873 K的环境下，采用分离式霍普金森杆装置对高氮钢试样进行了102~103 s-1应变率下的动态加载实验。结合准静态实验结果，分析了应变率和温度对材料塑性流动特性的影响。结果表明：高氮钢的动态力学行为具有很强的应变率敏感性和温度敏感性。当应变率达到400 s-1或更高时，流动应力随应变率的增加显著升高；在同一应变率下，流动应力随温度的降低明显升高。研究了温度和应变率耦合效应对材料塑性行为的影响，得出温度软化效应在高氮钢高温动态塑性变形中起主导作用。基于经典的Johnson-Cook（J-C）模型，通过对实验数据的分析，得出了高氮钢材料的修正J-C本构方程，经验证修正J-C方程预测结果与实验结果吻合。
-
图 2 不同应变率下材料的真实应力应变曲线
Figure 2. True stress-strain curves of HNS at different strain rates
图 5 不同温度加载下材料的真实应力应变曲线
Figure 5. True stress-strain curves of HNS at different temperature
图 6 高温实验中温度、应变率对屈服应力的影响
Figure 6. Influence of temperature and strain rate on yield stress from high temperature tests
表 1 Chemical composition of the as-received high-nitrogen austenitic stainless steel
Table 1. Chemical composition of the as-received high-nitrogen austenitic stainless steel
Element Mass fraction/% N 0.88 Mn 19.28 Ni 2.01 Cr 19.32 Mo 0.0001 Cu 0.031 W 0.005 C 0.03 
下载: 导出CSV
-
[1] FRECHARD S, REDJAIMIA A. Dynamical behaviour and microstructural evolution of a nitrogen-alloyed austenitic stainless steel[J]. Materials Science & Engineering, 2008, 480(2008):89-95. DOI: 10.1016/j.msea.2007.07.014. [2] TOMOTA Y, NAKANO J, XIA Y, et al. Unusual strain rate dependence of low temperature fracture behavior in high nitrogen bearing austenitic steels[J]. Acta Materialia, 1998, 46(9):3099-3108. DOI: 10.1016/S1359-6454(98)00005-6. [3] SPEIDEL M O, KOWANDA C, DIENER M. High nitrogen steel 2003[M]. Swiss: Institute of Metallurgy, 2003:63. [4] PENG X. Dynamic pressure tests and constitution relation of high-nitrogen alloy steel[D]. Chengdu: Southwest Jiaotong University, 2009: 23-38. [5] 陈巍, 刘燕林, 齐志望, 等.高氮奥氏体装甲钢抗弹性能研究[J].兵器材料科学与工程, 2009, 32(6):51-55. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=bqclkxygc200906015CHEN Wei, LIU Yanlin, QI Zhiwang, et al. Research on ballistic behavior of high nitrogen austenitic armor steel[J]. Ordnance Material Science and Engineering, 2009, 32(6):51-55. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=bqclkxygc200906015 [6] GRAY G T. High-strain-rate testing of materials: the split-Hopkinson pressure bar[M]. 2nd ed. New York: John Wiley Press, 2000:96-110. DOI: 10.1002/0471266965.com023. [7] NICHOLAS T. Tensile testing of materials at high rates of strain[J]. Experimental Mechanics, 1981, 21(5):177-185. DOI: 10.1007/BF02326644. [8] TANG X, PRAKASH V, LEWANDOWSKI J. Dynamic tensile deformation of aluminum alloy 6061-T6 and 6061-OA[J]. Journal of Experimental Mechanics, 2007, 22(3/4):305-313. http://en.cnki.com.cn/Article_en/CJFDTotal-SYLX2007Z1015.htm [9] OWOLABI G, ODOH D, ODESHI A, ET AL. Occurrence of dynamic shear bands in AISI 4340 steel under impact loads[J]. World Journal of Mechanics, 2013, 211(3):139-145. DOI: 10.4236/wjm.2013.32011. 期刊类型引用(4)
1. 张旭升，杨慧芳，秦睿贤，王希，陈秉智. 不锈钢点焊车用材料JC本构模型构建及车体纵向动态承载能力研究. 铁道车辆. 2024(06): 45-55 . 
百度学术2. 王彦莉，万明明，牟晓明，尹飞，厉雪，梁家毅，白嵘. 基于DIC的7A52铝合金动态拉伸性能研究. 兵器材料科学与工程. 2023(02): 78-83 . 百度学术3. 张继林，贾海深，易湘斌，窦建明，唐林虎，秦娟娟，徐创文. 高温高应变率对06Cr19Ni10奥氏体不锈钢动态力学性能的影响. 钢铁钒钛. 2022(01): 145-151 . 百度学术4. 宁小智，邢长军，雍岐龙，翁建寅. 热拔工艺对高氮无镍奥氏体不锈钢线材开裂的影响. 中国冶金. 2020(05): 47-50+75 . 百度学术其他类型引用(2)
-
百度学术
计量
- 文章访问数: 5043
- HTML全文浏览量: 1196
- PDF下载量: 166
- 被引次数: 6