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Refinement mechanism of cerium addition on solidification structure and sigma phase of super austenitic stainless steel S32654

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Journal of Materials Science & Technology 2022年第7期102卷 105-114页

作者： Shucai Zhang Jiangtao Yu Huabing Li Zhouhua Jiang Yifeng Geng Hao Feng Binbin Zhang Hongchun Zhu School of Metallurgy Northeastern UniversityShenyang 110819China School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China

The influence of Ce addition on the solidification structure and σphase of super austenitic stainless steel S32654 was systematically investigated via microstructural characterization and thermodynamic calcula- tion. The results indicate that a small addition of Ce could modify MgO and MnS into Ce-bearing inclu- sions Ce_(2)O_(3)and Ce_(2)O_(2)S. Ce addition led to noticeable refinement of both the dendrite structure and σphase. The refinement mechanism could be attributed to the combined actions of effective Ce-bearing inclusions and solute Ce. Effective Ce-bearing inclusions could serve as heterogeneous nucleation cores of austenite as well as σphase, which provided a favorable prerequisite for their refinement. Solute Ce significantly enhanced the undercooling degree of the system, further promoting dendrite structure re- finement. Meanwhile, solute Ce improved the eutectic precipitation conditions of σphase and further promoted its nucleation, while the dendrite refinement limited its growth space. Finally, more fine and dispersed σphase particles formed in S32654 with Ce addition. The refinement of dendrite structure and σ phase will reduce the temperature and time required for high-temperature homogenization, which is beneficial to the hot working of this steel.

关键词： super austenitic stainless steel Cerium Solidification structure Sigma phase Refinement

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维普期刊数据库

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Influence mechanism of boron segregation on the microstructure evolution and hot ductility of super austenitic stainless steel S32654

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Journal of Materials Science & Technology 2022年第17期112卷 184-194页

作者： Jiangtao Yu Shucai Zhang Huabing Li Zhouhua Jiang Hao Feng Panpan Xu Peide Han School of Metallurgy Northeastern UniversityShenyang 110819China Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education) Shenyang 110819China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

Influence mechanism of B segregation on the microstructure evolution and hot ductility of S32654 at850-1250℃was systematically investigated through experimental research and theoretical calculation.The results demonstrated that the segregation of B at grain boundary(GB)played different roles in the microstructure evolution and hot ductility at various temperatures.At 850℃,B segregation inhibited Mo segregation at the GB and enhanced the GB cohesion.At 900-950℃,B segregation restricted the diffusion and segregation of Mo to the GB,inhibiting the precipitation ofσphase.At 1000-1050℃,B segregation accelerated the dislocation accumulation and limited the GB migration,promoting the nucleation and inhibiting the growth of DRX grains.At 1100-1150℃,B has little effect on the DRX due to sufficient energy supply by higher temperature.Under the above beneficial effects of B,the hot ductility of S32654 was improved to varying degrees at 850-1150℃.However,as the temperature increased to1200-1250℃,B segregation decreased the solidus temperature and enhanced the liquefaction cracking tendency,resulting in a deterioration of the hot ductility.

关键词： super austenitic stainless steel Boron Hot ductility Grain boundary segregation Atom probe tomography

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Influence of N on precipitation behavior,associated corrosion and mechanical properties of super austenitic stainless steel S32654

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Journal of Materials Science & Technology 2020年第7期42卷 143-155页

作者： Shucai Zhang Huabing Li Zhouhua Jiang Zhixing Li Jingxi Wu Binbin Zhang Fei Duan Hao Feng Hongchun Zhu State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819China School of Metallurgy Northeastern UniversityShenyang110819China

The influence of N on the precipitation behavior,associated corrosion,and mechanical properties of S32654 were investigated by microstructural,electrochemical,and mechanical analyses.Increasing the N content results in several alterations:(1) grain refinement,which promotes intergranular precipitation;(2) a linear increase in the driving force for Cr2 N and Mo activity,which accelerates the precipitation of intergranular Cr2 N and π phase,respectively;(3) a linear decrease in the driving force for σ phase and Cr activity,which suppresses the formation of intragranular σ phase.The total amount of precipitates first decreased and then increased with the N content increasing.Furthermore,the intergranular corrosion susceptibility depended substantially on the total amount of precipitates and also first exhibited a decreasing and then an increasing trend as the N content increased.In addition,aging precipitation caused a considerable decrement in the ultimate tensile strength(UTS) and a remarkable increment in the yield strength(YS).Both the UTS and YS always increased with N content increasing throughout the solution and aging process.Whereas the elongation was considerably sensitive to the aging treatment,it exhibited marginal variation with the N content increasing.

关键词： super austenitic stainless steel Nitrogen Precipitation behavior Intergranular corrosion Mechanical properties

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UNS N08935——a new and smarter grade for severe corrosive environments

UNS N08935——a new and smarter grade for severe corrosive e...

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第十一届全国腐蚀与防护大会

作者： Dragon Hao Sandvik Materials Technology Technical Marketing

Material selection is a key factor when designing new solutions or facing corrosion in the petrochemical industry.The technical challenges are often complex and include a combination of different corrosion types such as pitting and crevice corrosion,stress corrosion cracking (SCC),and general corrosion in acidic environments.Additionally,high mechanical strength at maximum application temperature is also crucial and can i.***.reduce wall thicknesses and increase the heat transfer in heat exchangers.These challenges require good process control and advanced materials.Sanicro35 (UNS N08935) is a new grade with corrosion and mechanical properties comparable to highly alloyed nickel-based alloys.With a well-balanced composition of 35Ni-30Fe-27Cr-6.5Mo-0.3N,high structure stability,a PRENof 52 and CPT 110℃ in ASTM G150 it is suitable for many different applications with demanding corrosive challenges.This paper presents the results of general corrosion testing in some of the most common acids,localized corrosion testing in 3 M MgCl,1 M NaCl and seawater,SCC-testing in 40%CaCl along with mechanical properties at ambient and elevated temperatures.PREN=%Cr+3.3 x(%Mo+0.5%W)+16%N

关键词： super austenitic stainless steel nickel-based alloy localized corrosion resistance acid corrosion resistance stress corrosion cracking resistance

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