Influence of aluminium on retained austenite stabilization during thermomechanical treatment of low-alloyed TRIP steel
Influence of aluminium on retained austenite stabilization during thermomechanical treatment of low-alloyed TRIP steel
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铝对低合金TRIP钢形变热处理过程中残余奥氏体稳定性的影响
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
B. Mašek
中科院分区：
文献类型：
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作者：
H. Staňková;L. Skálová;L. Meyer;B. Mašek
TRIP 钢是多相钢。目前，它们主要用于汽车行业，最常用于制造车身面板。通过形变热处理获得的薄壁空心半成品可以代表新的可能应用。在标准 TRIP 钢中，贝氏体转变期间的渗碳体析出和残余奥氏体稳定化主要通过硅合金化进行。在某些应用中，较高浓度的硅会导致表面质量问题。考虑替代硅的合金元素之一是铝，其添加不仅限制贝氏体转变过程中碳化物和珠光体的形成，而且增加针状铁素体的形成。较低的固溶硬化值和M s 温度的升高代表了添加铝的缺点。对 0.26C-1.5Mn-1.3Al 钢进行了各种贝氏体转变参数的热机械处理研究，目的是确定铝如何影响组织发展、残余奥氏体稳定性和机械性能。通过光学和共焦显微镜对实验获得的结构进行了分析。通过图像分析确定铁素体和残余奥氏体的分数以及铁素体晶粒的尺寸。
TRIP steels are multiphase steels. At present, the y find their use primarily in the automotive industry, where they are most frequently utilized for manufacturing body panels. The thin-walled hollow semi-products obtained by thermomechanical treatment could represent new possible applications. In standard TRIP steels ceme ntite precipitation during bainitic transformation and retained austenite stabilization are carried out mainly through silicon alloying. Silicon at higher concentrations causes p roblems with surface quality in some applications. One of the alloying elements being ta ken into consideration for silicon replacement is aluminium, whose addition not only restricts car bide and pearlite formation during bainitic transformation, but also increases formation of aci cular ferrite. A lower value of solid solution hardening and the increase of the M s temperature represent the disadvantages of alumini um addition. Thermomechanical treatment with various parameters of bainitic transformation was investigated on the 0.26C-1.5Mn-1.3Al steel with th e aim of determining how aluminium affects structure development, retained austenite stabiliza tion and mechanical properties. Experimentally achieved structures were analyzed by means of light and confocal microscopy. The fraction of ferrite and retained austenite as w ell as the size of ferritic grains were determined via image analysis.