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Influence of processing parameters on lattice parameters in laser deposited tool alloy steel

机译:工艺参数对激光沉积工具合金钢晶格参数的影响

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Laser aided direct metal deposition (DMD) has been used to form AISI 4340 steel coating on the AISI 4140 steel substrate. The microstructural property of the DMD coating was analyzed by means of scanning electron microscopy, transmission electron microscopy and X-ray diffractometry. Microhardness of the DMD was measured with a Vickers microhardness tester. Results indicate that DMD can be used to form dense AISI 4340 steel coatings on AISI 4140 steel substrate. The DMD coating is mainly composed of martensite and retained austenite. Consecutive thermal cycles have a remarkable effect on the microstructure of the plan view of the DMD coating and on the corresponding microhardness distribution. Orientation relationships among austenite, martensite and cementite in the DMD coating followed the ones in conventional heat treated steels. As the laser specific energy decreased, cooling rate increased, and martensite peaks broadened and shifted to a lower Bragg's angle. Also martensite lattice parameters increased and austenite lattice parameters decreased due to the above parameter change.
机译:激光辅助直接金属沉积(DMD)已用于在AISI 4140钢基材上形成AISI 4340钢涂层。通过扫描电子显微镜,透射电子显微镜和X射线衍射法分析了DMD涂层的显微结构。用维氏显微硬度测试仪测量DMD的显微硬度。结果表明,DMD可用于在AISI 4140钢基底上形成致密的AISI 4340钢涂层。 DMD涂层主要由马氏体和残余奥氏体组成。连续的热循环对DMD涂层的平面组织和相应的显微硬度分布具有显着影响。 DMD涂层中奥氏体,马氏体和渗碳体之间的取向关系遵循传统热处理钢中的取向关系。随着激光比能的降低,冷却速率增加,马氏体峰变宽并移至较低的布拉格角。由于上述参数变化,马氏体晶格参数也增加,奥氏体晶格参数减少。

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