基于S31254不锈钢的耐蚀非晶合金  

Corrosion resistant amorphous alloy based on S31254 stainless steel

作　　者：陈彦霖 刘磊[1,2] 莫帅 许晟嘉 艾文杰 刘涛[1,2] 张华[1,2] 倪红卫[1,2] CHEN Yanlin;LIU Lei;MO Shuai;XU Shengjia;AI Wenjie;LIU Tao;ZHANG Hua;NI Hongwei(Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;School of Metallurgy and Energy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [2]武汉科技大学冶金与能源学院,湖北武汉430081

出　　处：《钢铁》2025年第2期103-109,127,共8页Iron and Steel

基　　金：国家自然科学基金青年基金资助项目(52304354);国家自然科学基金联合基金重点资助项目(U23A20606)。

摘　　要：铁基非晶合金具有长程无序的结构特征,成分均匀且没有晶界和位错等缺陷,其耐磨耐蚀性能远超传统不锈钢。但是,耐蚀非晶合金的制备通常需要添加高含量的铬、钼等金属进行重熔合金化,导致原料成本高且熔炼难度大。基于此,提出了利用S31254不锈钢制备耐蚀非晶合金的新方法。基于S31254不锈钢的成分特征,结合混合焓和原子尺寸差分析,设计了S31254+15C+6B(原子数分数,%)耐蚀非晶合金新成分;并利用FactSage详细计算了精炼渣低熔点区域和渣-金平衡,确定了适用于S31254+15C+6B非晶合金的10%SiO_(2)-40%CaO-25%Al_(2)O_(3)-25%B_(2)O_(3)(质量分数)新型低熔点精炼渣;采用单辊旋淬工艺成功制备了合金化前后和精炼前后的合金带材;并利用XRD和电化学工作站评价了合金带材的非晶形成能力和耐腐蚀性能。研究结果表明,B、C元素合金化后,合金的成带工艺性明显提升,能够制备得到表面质量良好的合金带材;精炼后合金中O、S含量明显降低,非晶形成能力显著提升,能够在20~35 m/s不同甩带速率下制备25~42μm的非晶态带材;而且S31254+15C+6B非晶合金具有较宽的钝化区间和较大的阻抗半径,具有优异的耐腐蚀性,明显优于S31254不锈钢。提出的基于S31254不锈钢制备耐蚀非晶合金具有可行性,通过设计符合S31254不锈钢成分特征的非晶合金,能够充分利用其中的Fe、Ni、Cr、Mo等元素,并结合精炼工艺制备了具有优异耐蚀性的S31254+15C+6B非晶合金。Fe-based amorphous alloy has the structural characteristics of long-range disorder,uniform composition and no defects such as grain boundaries and dislocations.The wear and corrosion resistance of amorphous alloy is much better than that of traditional stainless steel.However,the preparation of corrosion-resistant amorphous alloys usually requires the addition of high content of chromium and molybdenum for remelting and alloying,leading to the high cost of raw materials and the difficulties in melting.Therefore,a novel strategy for preparing corrosionresistant amorphous alloy by using S31254 stainless steel was proposed.Combined with the analysis of the composition characteristics of S31254 stainless steel and the mixing enthalpy as well as the atomic size difference,a new corrosion-resistant amorphous alloy with the composition of S31254+15C+6B(atom fraction,%)was designed.The low melting point region and slag-metal equilibrium of refining slag were calculated in detail by using FactSage.As a result,a low melting point refining slag of 10%SiO_(2)-40%CaO-25%Al_(2)O_(3)-25%B_(2)O_(3)(mass fraction)suitable for S31254+15C+6B amorphous alloy was determined.Alloy ribbons were then successfully prepared by using the single-roller melt-spinning technique before and after alloying and refining.The amorphous forming ability and corrosion resistance of the ribbon samples were evaluated via XRD and electrochemical workstation.The results show that the manufacturability of ribbons is significantly improved after the alloying of B,C elements,and the ribbons with good surface quality can be readily obtained.After refining,the content of O and S in the alloy is significantly reduced,and the amorphous forming ability is significantly improved.Amorphous ribbons of 25-42μm can be prepared at different melt-spinning rates of 20-35 m/s.Moreover,the S31254+15C+6B amorphous alloy exhibits a wide passivation interval and a large impedance radius,demonstrating the excellent corrosion resistance of the S31254+15C+6B amorphous alloy,whi

关 键 词：S31254不锈钢 成分设计 非晶合金 精炼渣设计 精炼 耐腐蚀性 非晶形成能力 合金带材 

分 类 号：TG139.8[一般工业技术—材料科学与工程] TG142.71[金属学及工艺—合金]