工程科学学报，第38卷，第12期：1755-1761,2016年12月 Chinese Journal of Engineering,Vol.38,No.12:1755-1761,December 2016 D0l:10.13374/j.issn2095-9389.2016.12.014:http://journals.ustb.edu.cn 经济型双相不锈钢2101中氮化物在基体中的平衡固 溶度计算 冯志慧，李静媛四，王一德 北京科技大学材料科学与工程学院，北京100083 ☒通信作者，E-mail:lijy@ustb.cdu.cm 摘要为了解析出物对经济型双相不锈钢2101热塑性的影响机制，对比了相同工艺下2101和2205双相不锈钢在热变形 过程中相界析出物产生的规律.结果表明：2101钢比2205钢的相界处更倾向于产生析出物，促使后续热变形过程中相界产 生裂纹，进而影响材料的热塑性.根据热力学相关数据，通过Thermo-Calc和实验测试数据，推导出2101和2205双相不锈钢 析出物CrN的平衡固溶度公式，计算实验钢中析出物CrN的全固溶温度，同时引入Wagner相互作用系数，考虑了Ni、Mn、 Mo和Si对固溶度积公式的影响.发现2101双相不锈钢中Cr2N的全固溶温度比2205钢高100℃左右，计算结果和实验结果 吻合较好.实际生产过程中必须控制双相不锈钢热轧的终轧温度到全固溶温度以上，否则相界容易产生氮化物析出，影响材 料热塑性 关键词双相不锈钢：热塑性：析出物；固溶温度 分类号TG142.71:TG335.11 Equilibrium solid solubility of nitrides in the matrix of lean duplex stainless steel 2101 FENG Zhi-hui,LI Jing-yuan,WANG Yi-de School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:lijy@ustb.edu.cn ABSTRACT In order to improve the thermoplasticity of lean duplex stainless steel,the precipitation law and mechanism of lean du- plex stainless steel 2101 (LDX2101)and duplex stainless steel 2205 (DSS2205)were studied in hot rolling.It is found that LDX2101 is susceptible to nitride precipitation at phase boundaries compared with DSS2205,which causes microcracks and results in the thermoplasticity of specimens worsen.According to relevant thermodynamic data,the equilibrium solid solubility formulas of Cr,N precipitation in LDX2101 and DSS2205 were deduced,and total solid solution temperatures of CrN precipitation were calculated through Thermo-Calc software and experimental data.Meanwhile,the Wagner interaction coefficient was introduced to consider the in- fluence of Ni,Mn,Mo and Si on the equilibrium solid solubility product formula.The results show that the total solid solution temper- ature of Cr N precipitation in LDX2101 is around 100C higher than that in DSS2205.The calculation results and experimental results are in good agreement.The finishing hot rolling temperature must be above the total solid solution temperature in the practical produc- tion process to prevent CraN precipitation.Otherwise,the nitride precipitation is prone to produce at phase boundaries,which influ- ences the thermoplasticity of the materials. KEY WORDS duplex stainless steel:thermoplasticity:precipitates:solid solution temperature 氮元素既能起到强烈的稳定奥氏体结构，扩大奥氏体区的作用，同时也能够提高材料的耐磨性、耐疲劳 收稿日期：201603-14 基金项目：国家自然科学基金资助项目(U1660114):国家科技支撑计划资助项目(2015AA03A502)工程科学学报，第 38 卷，第 12 期: 1755--1761，2016 年 12 月 Chinese Journal of Engineering，Vol． 38，No． 12: 1755--1761，December 2016 DOI: 10． 13374 /j． issn2095--9389． 2016． 12． 014; http: / /journals． ustb． edu． cn 经济型双相不锈钢 2101 中氮化物在基体中的平衡固 溶度计算 冯志慧，李静媛，王一德 北京科技大学材料科学与工程学院，北京 100083  通信作者，E-mail: lijy@ ustb． edu． cn 摘 要 为了解析出物对经济型双相不锈钢 2101 热塑性的影响机制，对比了相同工艺下 2101 和 2205 双相不锈钢在热变形 过程中相界析出物产生的规律． 结果表明: 2101 钢比 2205 钢的相界处更倾向于产生析出物，促使后续热变形过程中相界产 生裂纹，进而影响材料的热塑性． 根据热力学相关数据，通过 Thermo--Calc 和实验测试数据，推导出 2101 和 2205 双相不锈钢 析出物 Cr2N 的平衡固溶度公式，计算实验钢中析出物 Cr2N 的全固溶温度，同时引入 Wagner 相互作用系数，考虑了 Ni、Mn、 Mo 和 Si 对固溶度积公式的影响． 发现 2101 双相不锈钢中 Cr2N 的全固溶温度比 2205 钢高 100 ℃左右，计算结果和实验结果 吻合较好． 实际生产过程中必须控制双相不锈钢热轧的终轧温度到全固溶温度以上，否则相界容易产生氮化物析出，影响材 料热塑性． 关键词 双相不锈钢; 热塑性; 析出物; 固溶温度 分类号 TG142. 71; TG335. 11 Equilibrium solid solubility of nitrides in the matrix of lean duplex stainless steel 2101 FENG Zhi-hui，LI Jing-yuan ，WANG Yi-de School of Materials Science and Engineering，University of Science and Technology Beijing，Beijing 100083，China  Corresponding author，E-mail: lijy@ ustb． edu． cn ABSTＲACT In order to improve the thermoplasticity of lean duplex stainless steel，the precipitation law and mechanism of lean du￾plex stainless steel 2101 ( LDX2101) and duplex stainless steel 2205 ( DSS2205 ) were studied in hot rolling． It is found that LDX2101 is susceptible to nitride precipitation at phase boundaries compared with DSS2205，which causes microcracks and results in the thermoplasticity of specimens worsen． According to relevant thermodynamic data，the equilibrium solid solubility formulas of Cr2N precipitation in LDX2101 and DSS2205 were deduced，and total solid solution temperatures of Cr2 N precipitation were calculated through Thermo-Calc software and experimental data． Meanwhile，the Wagner interaction coefficient was introduced to consider the in￾fluence of Ni，Mn，Mo and Si on the equilibrium solid solubility product formula． The results show that the total solid solution temper￾ature of Cr2N precipitation in LDX2101 is around 100 ℃ higher than that in DSS2205． The calculation results and experimental results are in good agreement． The finishing hot rolling temperature must be above the total solid solution temperature in the practical produc￾tion process to prevent Cr2N precipitation． Otherwise，the nitride precipitation is prone to produce at phase boundaries，which influ￾ences the thermoplasticity of the materials． KEY WOＲDS duplex stainless steel; thermoplasticity; precipitates; solid solution temperature 收稿日期: 2016--03--14 基金项目: 国家自然科学基金资助项目( U1660114) ; 国家科技支撑计划资助项目( 2015AA03A502) 氮元素既能起到强烈的稳定奥氏体结构，扩大奥 氏体区的作用，同时也能够提高材料的耐磨性、耐疲劳