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Precipitation Behavior and Mechanical Properties of a 16Cr-25Ni superaustenitic stainless steel Weld Metal During Post-weld Heat Treatment

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Acta Metallurgica Sinica(English Letters) 2022年第4期35卷 577-590页

作者： Wenbin Tian Dong Wu Yiyi Li Shanping Lu Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

A 16Cr-25Ni superaustenitic stainless steel weld metal for austenitic stainless steel/ferrite heat-resistance steel dissimilar metal weld was designed and prepared through tungsten inert-gas welding.The precipitate evolution and its correlation with mechanical properties were investigated during post-weld heat treatment(PWHT)at 690℃ for up to 12 h.The primary precipitates in the as-welded weld metal were identified as Mo-rich M6C carbides in the interdendritic region and semicontinuous fine-sized M23C6 carbides along grain boundary.After PWHT,three types of precipitates coexisted in the interdendritic region:primary M6C carbides,newly precipitated Mo-rich M2X carbonitrides and some of the secondary M23C6 carbides.Additionally,mass secondary M23C6 carbides formed and coarsened along grain boundary.No undesirable intermetallic phases formed during the whole period.The M2X and interdendritic M23C6 improved the strength of the weld metal after PWHT,but the elongation and impact toughness degraded,which were mainly owing to the intergranular M23C6 carbides that changed the fracture mode from ductile transgranular mode to mixed mode of transgranular and intergranular fracture.Meanwhile,the coarsening of M2X carbonitrides may lead to the elongation loss during 8 h to 12 h.Evolution of impact toughness was also related to the M2X carbonitrides,which made the crack easier to propagate compared with austenitic matrix and contributed to the decline of impact toughness.However,due to the sluggish precipitation of M2X carbonitrides with longer holding time,the decreasing trend became slow from 4 to 12 h.The results showed that PWHT should be controlled within 8 h to obtain better combination of strength and ductility.

关键词： superaustenitic stainless steel Weld metal Post-weld heat treatment Precipitate evolution Mechanical properties

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Hot Working Characteristic of superaustenitic stainless steel 254SMO

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Acta Metallurgica Sinica(English Letters) 2014年第2期27卷 313-323页

作者： Enxiang Pu Wenjie Zheng Jinzhong Xiang Zhigang Song Han Feng Yuliang Zhu School of Physics Science and Technology Yunnan University Central Iron and steel Research Institute

Abstract Hot deformation characteristic of superaustenitic stainless steel 254SMO has been studied by isothermal compression testing in the temperature range of 950-1,200 ℃ and strain rate range of 0.01-10 s^-1. The activation energy of 496 kJ/mol was calculated by a hyperbolic-sine type equation over the entire range of strain rates and temperatures. In order to obtain optimum hot working conditions, processing maps consisting of power dissipation map and instability map were constructed at different strains. The power dissipation map exhibits two domains with relatively high efficiencies of power dissipation. The first domain occurs in the temperature range of 990-1,070 ~C and the strain rate range of 0.01-0.1 s^-1. Microstructure observation in this domain indicates the partial dynamic recrystallization （DRX） accompanied with precipitation of tetragonal sigma phase. The second domain occurs in the temperature range of 1,140-1,200 ℃ and the strain rate range of 0.01-1 s^-1 with a peak efficiency of power dissipation of 39%, and in this domain, the microstructure observation reveals the full DRX. The instability map shows that flow instability occurs at the temperatures below 1,140 ℃ and the strain rates above 0.1 s^-1.

关键词： Processing map 254SMO superaustenitic stainless steel Hot deformation

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Constitutive Modeling for Flow Behaviors of superaustenitic stainless steel S32654 during Hot Deformation

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Journal of Iron and steel Research(International) 2016年第2期23卷 178-184页

作者： En-xiang PU Han FENG Min LIU Wen-jie ZHENG Han DONG Zhi-gang SONG Central Iron and steel Research Institute Beijing 100081China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

Hot deformation behavior of superaustenitic stainless steel S32654 was investigated with hot compression tests at temperatures of 950-1250 C and strain rates of 0. 001-10 s-1. Above 1150 ℃, with strain rate lower than 0.1 s -1 , the flow curves exhibit nearly steady state behavior, while at higher strain rate, continuous flow softening occurs. To provide a precise prediction of flow behavior for the alloy, the constitutive modeling considering effect of strain was derived on the basis of the obtained experimental data and constitutive relationship which incorporated Ar- rhenius term and hyperbolic sine type equation. The material constants α, n, Q and lnA are found to be functions of the strain and can be fitted employing eighth-order polynomial. The developed constitutive model can be employed to describe the deformation behavior of superaustenitic stainless steel S32654.

关键词： S32654 superaustenitic stainless steel hot deformation constitutive modeling

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Metadynamic Recrystallization Behavior of As-cast 904L superaustenitic stainless steel

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Journal of Iron and steel Research(International) 2016年第2期23卷 151-159页

作者： Wei ZHANG Jing ZHANG Ying HAN Rong LIU De-ning ZOU Guan-jun QIAO State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University State Key Laboratory of Solidification Processing Northwestern Polytechnical University Key Laboratory of Advanced Structural Materials of Ministry of Education Changchun University of Technology School of Metallurgy and Engineering Xi'an University of Architecture and Technology

The metadynamic recrystallization （MDRX） behavior of as-cast 904L superaustenitic stainless steel was in- vestigated by double pass isothermal compression tests at temperatures of 950-1 150 ℃, strain rates of 0.05-5 s 1 and interval of 1-100 s. The effects of working parameters （deformation temperature, strain rate, pre-strain and in- terval time） on the flow curves and microstructural evolution were discussed. The MDRX fraction increased obvious- ly with the increase of deformation temperature, strain rate and interval time. The MDRX softening was controlled by the migration of grain boundary, annihilation of dislocation and dynamic recrystallization. Moreover, the kinetic model was established for the prediction of MDRX behavior of as-cast 904L superaustenitic stainless steel based on the experimental data. A good agreement between the predicted and the experimental values was achieved （correla- tion coefficient R2= 0.98）, indicating a satisfactory accuracy.

关键词： superaustenitic stainless steel hot deformation metadynamic recrystallization

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Effect of Thermomechanical Parameters on Σ3~n Grain Boundaries and Grain Boundary Networks of a New superaustenitic stainless steel

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Journal of Iron and steel Research(International) 2014年第1期21卷 109-115页

作者： Hong-ying SUN Zhang-jian ZHOU Man WANG Xiao LI School of Materials Science and Engineering University of Science and Technology Beijing Technology Center Anyang Iron and Steel Group Company Metallurgy Engineering Research Institute University of Science and Technology Beijing

Hot compression tests were conducted in a temperature range of 800--1100 ℃and strain rate range of 0. 1- 10 s^-1 using a Gleeble 3500 thermomechanical simulator to investigate the influence of hot deformation parameters （temperatures, strain rates and strains） on the grain boundary network evolution of a new grade Fe-Cr-Ni superaustenitic stainless steel. The results showed that a dominant effect of deformed temperature is ∑3^n （n = 0, 1, 2, 3） boundaries population increased with decreasing temperature, while they first increased and then reduced with in- creasing strain and strain rate. Interestingly, besides E3n （n = 1, 2, 3） twin grain boundaries, some El boundaries could interrupt grain boundaries network effectively, which enhance material performances. But they are scarcely re- ported. The misorientation of some segments LAGBs in the deformed microstructure （pancaked grains） increased and slid to high angle grain boundaries with increasing the fraction of reerystallized grains during hot deformation.

关键词： superaustenitic stainless steel thermomechanieal processing electron backscatter diffraction （EBSD） coincidence site lattice grain boundary grain boundary engineering

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