SA508 Gr 3, a bainitic forging steel employed in the fabrication of nuclear pressure vessels has been characterised after dry-milling to investigate extent of machining abuse on the surface. A detailed study of the evolution of residual stresses, microstructure, micro-hardness and roughness in relation to different milling parameters is presented. A central composite orthogonal (CCO) design of experiments (DoE) was used to generate a statistic model of the milling process. Deformation of the sub-surface layer was assessed via SEM BSE imaging. The developed statistical model is discussed aiming to illustrate availability of different cost-effective manufacturing techniques meeting the high standards required by the industry.
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机译：SA508 Gr 3是用于制造核压力容器的贝氏体锻钢，经过干磨后已进行了表征，以研究表面加工不良的程度。给出了与不同铣削参数有关的残余应力，显微组织，显微硬度和粗糙度演变的详细研究。使用中央复合正交试验（DoE）设计（DoE）生成铣削过程的统计模型。通过SEM BSE成像评估表面下层的变形。讨论了开发的统计模型，旨在说明满足行业要求的高标准的各种具有成本效益的制造技术的可用性。
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