Effect of Velocity of Atmospheric Laminar flow Plasma on Microstructure and Properties of Ductile Iron
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摘要: 采用自行研制的表面淬火层流等离子体系统,对QT450球墨铸铁进行表面淬火。用光学显微镜(OM)、显微硬度仪、X射线衍射仪(XRD)、扫描电镜(SEM)等,研究了淬火区的尺寸、组织结构和硬度。研究表明,淬火试样的表面组织为渗碳体、细小珠光体、马氏体和部分残留奥氏体等。试样从表向里主要由熔融区、热影响区和基体三部分组成。在本研究范围内,当扫描速率为500 mm/min时,熔融区的尺寸最大,硬度最高。Abstract: The surface quenching of QT450 ductile iron was carried out by using a self-developed laminar plasma system for surface quenching.The size,microstructure,hardeness of quenching zone was studied by optical microscope（OM）,microhardness tester,X-ray diffraction（XRD）,and scanning electron microscope（SEM）.The results showed that the quenching zone was composed of cementite,fine pearlite,martensite and partially retained austenite.The cross section from the outside to the inside of the samples was mainly composed of quenching zone,heat affected zone and matrix.Under these conditions,when the scanning rate was 500 mm/min,the size of the molten zone was the largest and the hardness was the highest.
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Key words:
- ductile iron /
- surface quenching /
- plasma /
- scanning rate /
- microstructure /
- hardness
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