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首页> 外文期刊>ISIJ international >Microstructural Change and Hardness Profile of Roll Materials after Laser Irradiation and Tempering Process
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Microstructural Change and Hardness Profile of Roll Materials after Laser Irradiation and Tempering Process

机译：激光辐照回火后辊材的显微组织变化和硬度分布

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摘要

Laser irradiation, using a continuous wave CO_(2) crosscurrent laser with generated beam power of 1 kW, was performed on an adamite steel and an indefinite chilled cast iron roll materials which were used in the industries. Optical microscopy, Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) were applied to reveal the microstructural details. In addition, microvickers hardness test was conducted on the laser beam irradiated samples to measure hardness profiles of the laser treated area. The results indicate that, laser irradiated areas of two roll samples sequentially consist of melting zone, phase transformation zone and non-transformed heat affected zone on sections. The hardnesses at the melting zone on both samples are relatively low when the samples were irradiated by the laser, but increase dramatically after tempering at 540°C for 1 hr. On the other hand, the hardnesses at the phase transformation zones sharply decrease from high values when they were subjected to the tempering process for the irradiated samples. There are many small and well distributed FeS and MnS inclusions in the melting zone at the both roll samples. It also was observed that, there are occasional hot tears occurred in the indefinite chilled cast iron sample, but not in the adamite steel.
机译：使用连续波CO_（2）横流激光产生的光束功率为1 kW，对工业上使用的金钢和不确定的冷硬铸铁轧辊材料进行激光照射。应用光学显微镜，扫描电子显微镜（SEM）和能量色散X射线光谱（EDS）揭示了微观结构细节。另外，对激光束照射的样品进行微维氏硬度测试，以测量激光处理区域的硬度分布。结果表明，两个轧辊试样的激光辐照区依次由熔炼区，相变区和非相变热影响区组成。当样品用激光照射时，两个样品的熔化区的硬度都相对较低，但在540°C回火1小时后，硬度显着提高。另一方面，当对相变区进行辐射处理的回火处理时，相变区的硬度从高值急剧降低。在两个轧辊样品的熔化区中都有许多细小且分布均匀的FeS和MnS夹杂物。还观察到，在不确定的冷硬铸铁样品中偶尔会发生热裂，而在金刚砂钢中则不会发生。

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