深拉伸用钢:第一部分
非铁合金的热机械处理(TMT):第一部分
DataPLUS 模块提供上万种金属材料和非金属材料的腐蚀数据、焊接性能、尺寸与公差信息以及涂层信息。 点击这里了解更多。
Overview of Total Materia database 2022 年 1月 12日
Overview of Total Materia database 2022 年 1月 13日
在使用Total Materia几个月之后,以及深刻体验过所有潜在功能之后,我非常感谢你们的卓越工作和持续稳定的升级服务。 Total Materia始终是用来达成这一目的唯一工具。
M. Manfredini Bonfiglioli Industrial Gearmotors 博洛尼亚, 意大利
我们的目标很简单,就是让 Total Materia成为全球工程师在材料领域的首选一站式解决方案
Prof. Dr. Viktor Pocajt, CEOKey to Metals AG
Rapid slurry formation (RSF) is a novel semi-solid metal forming technique which allows complex geometries to be formed in a single operation. Advantages of RSF include a much reduced suspension preparation time and cost and most importantly the ability to achieve a globular structure and high fluidity of suspension at the same time.
Rapid slurry formation is a semi-solid metal forming technique, which is based on a so-called solid enthalpy exchange material (EEM). It is a fascinating technology offering the opportunity to manufacture net-shaped metal components of complex geometry in a single forming operation.
The RSF process differs from other rheocasting processes because heat extraction and temperature control are not necessary. The RSF process is based on enthalpy exchange of two alloys where one alloy is the low superheat melt (high enthalpy).
The other one acts as the cold solid stirring material (low enthalpy) and is also known as enthalpy exchange material (EEM). During the process the EEM is submerged into the melt while stirring action is applied. Heat is absorbed from the melt during stirring operation, and the two alloys with different enthalpies will form a new alloy system with a new enthalpy level.
RSF technology is able to extract a very large amount of heat through enthalpy exchange of similar material in a very short time. This also improves the castability of the alloy significantly. The reason being that through RSF technology, the morphology of the primary phase changes from coarse dendrites to near globular, which eliminates the feeding problem during solidification that is associated with conventional casting method.
The advantage of the method is that the relatively low solid phase fraction (20-30%) provides for achieving a globular structure with simultaneous retaining the high fluidity of suspension, and the preparation of the suspension is much shorter and cheaper than for other methods.
Figure 2(a) exhibits the typical as-cast structure of A 357 alloy where highly dendritic α-Al phase is present. Whereas Fig. 2(b-f) show semi-solid structures of A357 alloy at different rpm. One can see change in dendritic morphology of α-Al in semi-solid structure. This improves the castability of the alloy significantly. The reason being that through RSF technology, the morphology of the primary phase changes from coarse dendrites to near globular, which eliminates the feeding problem during solidification that is associated with conventional casting method.
References 1. L.Ratke, A.Sharma, D.Kohli: Effect of process parameters on properties of Al-Si alloys cast by Rapid Slurry Formation (RSF) technique, IOP Conf. Series: Materials Science and Engineering 27 (2011) 012068 doi:10.1088/1757-899X/27/1/012068; 2. A.Sharma: Synthesis of semi solid slurry and effect of inoculants on microstructure of A356 alloy cast by rapid slurry forming (rSF) process, La Metallurgia Italiana - n. 4/2013, p.53-58; 3. Z.Konopka, M.Lagiewka, M.Nadolski, A.Zyska: Theoretical analysis of the AlSi10Mg alloy suspension manufacturing by the RSF process, Archives of Metallurgy and Materials, Vol.55, Issue 3, 2010, p.869-873; 4. L.Ratke, A.Sharma, D.Kohli: The RSF Technology for Semi-Solid Casting Processes, Technical Paper, Indian Foundry Journal, Vol.57, No10. October 2011, p.33-36
Date Published: Jul-2017
输入搜索词:
搜索项
全文 关键字
标题 摘要
The Total Materia database contains a large number of metallography images across a large range of countries and standards.
Using the specifically designed Metallography tab in the menu bar, you can select the material of interest to you from the list of materials with metallography data included.
Metallography data can also be found through our standard quick search and will show relevant data is available through the standard Subgroup page for the material of interest.
Simply enter your material designation in to the "Material" field and select the standard of interest if known, then click "Search".
General information on microstructure can be found along with the relevant chemical composition for the material of interest.
Where available, a series of images will be provided showing a range of structural detail at various levels of magnification.
It is also possible to select different condition options from the "Select condition" drop-down to show metallography images under different process and heat treatment states.
For you’re a chance to take a test drive of the Total Materia database, we invite you to join a community of over 150,000 registered users through the Total Materia Free Demo.