合金元素对R5系泊链钢中平衡析出相的影响  

Effects of alloying elements on equilibrium precipitated phases in R5 offshore mooring chain steel

作　　者：曹瑞芳[1,2] 王福明[1,2] 李长荣[3] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]北京科技大学生态与循环冶金教育部重点实验室,北京100083 [3]北京科技大学材料科学与工程学院,北京100083

出　　处：《北京科技大学学报》2009年第12期1548-1554,共7页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(No.50874007);北京市教育委员会共建项目专项资助课题

摘　　要：采用Thermo-Calc热力学计算软件,对R5系泊链钢在400～1600℃存在的平衡析出相进行了热力学计算,并讨论了合金元素对平衡析出相的影响.结果表明,R5系泊链钢中平衡析出相主要为M23C6、M6C、MX和AlN,其中M为Cr、Fe、Mn、Mo、Nb、Ni和V等,X为C、N和空位Va等.在此基础上讨论了合金元素C、Cr、Mo和Nb对M23C6相、M6C相及MX相的平衡摩尔含量和平衡析出温度的影响,优化了新型R5系泊链钢的合金体系及热处理工艺,提出新型R5系泊链钢的最佳热处理工艺为920±30℃淬火和600±30℃回火,其中金属元素Mo的质量分数以0.45%为佳.Equilibrium precipitated phases in R5 offshore mooring chain steel in the temperature range of 400 to 1 600 ℃ were calculated using thermodynamic software Thermo-Calc. The effects of alloying elements on these equilibrium precipitated phases were studied. The results show that main equilibrium precipitated phases in R5 offshore mooring chain steel at temperatures of 400 to 1 600℃ are M23C6, M6C, MX and/kiN, where M represents Cr, Fe, Mn, Mo, Nb, Ni and V, and X is C, N and vacancy. On this basis the influences of alloying elements C, Cr, Mo and Nb on the equilibrium mole fraction and initial precipitated temperature of M23C6, MrC and MX phases were discussed. The composition system and heat treatment condition of new R5 offshore mooring chain steel were optimized. The optimized heat treatment process is quenching at 920 ±30 ℃ and tempering at 600 ± 30℃, and the optimum content of metal element Mo is 4.3 %.

关 键 词：系泊链钢 平衡析出相 热处理 热力学计算 

分 类 号：TG142.13[一般工业技术—材料科学与工程]