Abstract

The roughness R_Z, the duration of the area of laser thermal impact (ALTI) (L), and the inclination of cut wall (α) after various modes of laser cutting of steel sheets of different thickness of grades 40Kh, 20Kh13, 65G, 09G2S, 60S2KhA, and 30KhGSA have been determined. It has been established that, despite different chemical compositions of the steels, the microstructure of ALTI in surface areas after laser cutting (LC) is similar: a white layer with higher hardness, a layer with martensite structure and residual austenite, and a transient area between ALTI and initial structure not affected by LC. Mathematical models have been developed describing the influence of chemical composition, LC parameters, and sheet thickness on R_Z, L, and α. The procedure of selection of a rational LC mode is proposed and exemplified by multiparametric optimization making it possible to determine LC modes to provide the best quality of cut surface in the sheets of different thickness and chemical composition.

中文翻译：

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旨在提供所需的表面质量特性的工程钢板激光切割模式的选择

摘要

在不同厚度的40Kh，20Kh13、65G级钢板的各种激光切割方式下，粗糙度R _Z，激光热冲击持续时间（L）和切割壁的倾斜度（α），已确定09G2S，60S2KhA和30KhGSA。已经确定，尽管钢的化学成分不同，但是激光切割（LC）后表面积中的ALTI的微观结构是相似的：具有较高硬度的白色层，具有马氏体结构和残余奥氏体的层以及过渡区域在ALTI和初始结构之间不受LC影响。已开发出描述化学成分，LC参数和片材厚度对R _Z的影响的数学模型，L和α。提出并选择了合理的LC模式的程序，并通过多参数优化进行了举例说明，从而可以确定LC模式以在不同厚度和化学成分的板材中提供最佳切割表面质量。