Influence of austenitising temperature on the formation of strain induced martensite in austempered ductile iron
Influence of austenitising temperature on the formation of strain induced martensite in austempered ductile iron
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DOI：
10.1007/s10853-008-2717-8
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发表时间：
2008-07-01
影响因子：
4.5
通讯作者：
Rao, P. Prasad
中科院分区：
文献类型：
--
作者：
Daber, Srinivasmurthy;Ravishankar, K. S.;Rao, P. Prasad
研究了等温淬火温度对等温淬火球铁中应变诱发马氏体形成的影响。含1.5重量%的球墨铸铁镍，0.3重量%钼和0.5重量%对铜进行等温淬火处理，该处理包括三个等温淬火温度，即850、900和950 ℃，以及三个等温淬火温度，即300、350和400 ℃。在所有热处理条件下进行了拉伸试验，并应用Hollomon方程研究了应变硬化行为。通过光学显微镜和X射线衍射研究了微观结构。结果发现，增加奥氏体化温度增加的倾向，在所有的等温淬火温度下形成应变诱发马氏体。
The present work was taken up to study the influence of austenitising temperature on the formation of strain-induced martensite in austempered ductile iron. Ductile iron containing 1.5 wt.% nickel, 0.3 wt.% molybdenum and 0.5 wt.% copper was subjected to austempering treatments which consisted of three austenitising temperatures, namely 850, 900 and 950 degrees C, and three austempering temperatures, namely 300, 350 and 400 degrees C. Tensile tests were carried out under all the heat-treatment conditions and strain-hardening behaviour was studied by applying Hollomon equation. Microstructures were studied by optical microscopy and X-ray diffraction. It was found that increasing austenitising temperature increased the tendency for the formation of strain-induced martensite at all the austempering temperatures.