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排序方式: 共有163条查询结果,搜索用时 234 毫秒
1.
A Confocal Scanning Laser Microscope equipped with a gold image furnace was used to directly observe the precipitation of MnS during solidification of high sulphur steels under isothermal conditions in the temperature region 1440 to 1480°C on the free surface of the steel melt. For the case of Al‐killed steels, below 1480°C MnS particles were found to precipitate with Fe forming simultaneously around them. This MnS containing structure continued to grow rapidly (264 μm/s) as a surface film. The film gradually changed, as the level of S in the melt decreased, into a eutectic structure (with lamella spacing of 2 μm) as predicted by thermodynamics. In Si‐ killed steels there was significantly lower tendency to form MnS both in terms of time until precipitation occurred and growth rate. 相似文献
2.
3.
李新城 《武汉理工大学学报(材料科学英文版)》2010,(2)
MnS, MnS+V(C, N) complex precipitates in micro-alloyed ultra-fine grained steels were precisely analyzed to investigate the grain refining mechanism. The experimental results shows that MnS, MnS+V(C, N) precipitates provide nucleation center for Intra-granular ferrite (IGF), so that refined grain remarkably. Moreover, substructures such as grain boundary, sub-boundary, distortion band, dislocation and dislocation cell in austenite increased as the deformation energy led by heavy deformation at low temperatu... 相似文献
4.
Base metals of domestic pipeline steels were used to study the effect of Mn on corrosion properties of SSCC( Sulfide Stress Corrosion Cracking), and welds were carried out to study the effect of MnS on corrosion properties of HIC ( Hydrogen Induced Cracking) both in solutions with wet hydrogen sulfide ( H2 S ). They were respectively conducted by referring to the standards of SSCC and HIC. Testing results revealed that with the increase of content Mn, the resistance of SSCC will be decreased, from the point of metallurgic view, and it is Mn element not C element to lead to the testing results of SSCC. Meanwhile, even under the condition without inclusions MnS, HIC in welds still occurred. That is to say, MnS is not necessary for HIC, the presence of local banded structures in which Mn and P are inclined to aggregate cause to the phenomena of HIC. 相似文献
5.
为了研究PMO对GCr15轴承钢连铸坯中MnS夹杂物的影响,首先采用自动扫描电镜(Aspex Explorer)分析脉冲磁致振荡(Pulse Magneto-Oscillation,PMO)技术对钢中MnS类夹杂物组成和形貌的影响,然后利用电子探针测量固液界面前沿的元素含量,并在此基础上,计算了PMO处理后MnS析出温度变化。结果表明,PMO处理促进了内弧1/4、中心和外弧1/4处的大于8 μm的MnS夹杂物数量百分比的降低;PMO处理后固液界面前沿S元素质量分数在试样凝固50%和70%处分别降低60%和36%,而Mn元素含量变化不大;同时,PMO处理可降低MnS夹杂物的析出温度。 相似文献
6.
Louise Barry Joseph Tobin Mark Copley Justin D. Holmes David J. Otway Michael A. Morris 《Applied Catalysis A: General》2008,341(1-2):8-11
Novel MnS impregnated mesoporous silica systems have been originated for the generation of carbon nanocages. The procedure involves a simple catalytic vapour deposition (CVD) method. This is the first time that a transition metal sulfide has been used for the synthesis of carbon nanostructures. 相似文献
7.
The studies of the thermo-mechanic principles and the kinetic analysis of MnS precipitation behavior in oriented electrical
steels conducted in the last dozen years have been summarized. The problems and insufficiency in the fields concerning nucleation
theory of MnS precipitation, the relationship between the precipitation and dynamic recrystallization of the matrix as well
as the influence of high-energy boundary precipitation on the pinning effect of the boundary migration were discussed. Suggestions
were proposed to modify researches concerning the initial position density for MnS nucleation, the mutual interaction between
the precipitation and the dynamic recrystallization as well as the kinetic principles of precipitation nucleation on grain
boundaries with different boundary energy, which would complete the related theory of MnS precipitation behaviors. 相似文献
8.
9.
Marina Banuta Isabelle Tarquini Benoit Gauvin 《Journal of Failure Analysis and Prevention》2008,8(5):426-430
A failure investigation was performed on a ball joint from an ATV front suspension system. The location of the fracture was
the bearing ball/stud interface, which is a fusion-welded joint, and occurred after approximately 20 h of field-testing. The
two parts are made out of carbon steel and were previously heat-treated. Many elongated MnS inclusions were found in the stud
material, and these inclusions were parallel to the symmetry axis. Even though these inclusions were not significantly sized,
their number was important. Macroscopic evidence showed that the joint failed in a ductile mode under centered tensile overload.
Microscopic examination showed that MnS orientation changed in the fusion joint area. The inclusions had been redirected during
the welding process and laid parallel to the fracture surface. This reorientation caused a significant decrease in the effective
cross section of the joint and overload fracture occurred. 相似文献
10.
A novel method for testing stress–strain curves of non-metallic materials was presented. The high temperature stress–strain curves of MnS were preliminarily obtained and corrected to account for the influence of friction. Using the finite element method, the influence of deformation parameters on the deformation evolution of MnS inclusions was investigated based on the experimental reference data. The corresponding physical experiment was designed for comparative analysis. The results indicate that the experimental high-temperature deformation data of MnS are highly reliable. In the process of matrix deformation, the shapes of MnS inclusions change from spherical to ellipsoidal and even to lamellar. There are some differences in the morphological deformation of MnS inclusions located at different positions. With the increase in the initial size of MnS inclusions, the risk of failing the inclusion-flaw inspection increases and the forging quality further deteriorates. 相似文献