In this paper, we focus on the bonding mechanism of bimetallic clad tube because of its low cost and comprehensive properties. The numerical simulation and the experiment are carried out from the diffusion behavior of carbon atoms in the metallurgical bonding process. Based on the dislocation density model of Kocks, the tube billets are rolled by pilger hot rolling; the outer tube is 06Cr₁₉Ni₁₀ stainless steel, the inner tube is Q235 carbon steel, and the wall thickness ratio is 1 : 1. The research shows that the diffusion ability of carbon atoms mainly depends on the degree of the plastic strain in the stainless steel hot rolling process; there is positive correlation between the thickness of bonding carburized layer and the dislocation density produced by plastic deformation of stainless steel. The thickness difference of circumferential carburized layer in the deformation zone is larger than that near the finishing zone. Furthermore, a lot of contaminants cannot be completely metallurgically bonded between 20% and 30% reduction ratios; the contaminants near the bonding layer are refined and completely bonded metallurgically between 30% and 60% reduction ratios; the contaminants are further refined above 60% to 70% reduction ratio.

中文翻译：

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夹头热轧复合管的结合机理与实验验证

由于其低成本和综合性能，本文主要研究双金属复合管的结合机理。从碳原子在冶金结合过程中的扩散行为进行了数值模拟和实验。根据Kocks的位错密度模型，通过皮尔格热轧对管坯进行轧制。外管是06Cr ₁₉ Ni ₁₀不锈钢，内管为Q235碳钢，壁厚比为1：1。研究表明，碳原子的扩散能力主要取决于不锈钢热轧过程中塑性应变的程度；渗碳层的厚度与不锈钢塑性变形产生的位错密度成正相关。变形区周向渗碳层的厚度差大于精加工区附近的渗碳层的厚度差。此外，在20％到30％的还原率之间，许多污染物不能完全通过冶金结合。结合层附近的污染物被精炼并以30％到60％的还原率以冶金方式完全结合。污染物的还原率超过60％至70％。