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首页> 外文期刊>Metallurgist >MECHANISMS FOR IMPROVING CHEMICAL AND STRUCTURAL HOMOGENEITY OF HOT-ROLLED PRODUCT FOR OBJECTS PREPARED BY HOT STAMPING
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MECHANISMS FOR IMPROVING CHEMICAL AND STRUCTURAL HOMOGENEITY OF HOT-ROLLED PRODUCT FOR OBJECTS PREPARED BY HOT STAMPING

机译：改善热压成型物体的热轧产品化学和结构均质性的机制

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摘要

Redistribution of components forming the structure and properties during hot rolling of microalloyed steels, similar in chemical composition to hardened steels during hot stamping, of an industrial melt containing carbon from 0.098 to 0.219%, is studied in detail. It is established that a key production parameter controlling the intensity of occurrence of these processes is the temperature at the start of rolling in the finishing group of stands, i.e., T-6. An increase in T-6 leads to significant enrichment with respect to carbon content, and a finer structure due to the formation of niobium carbonitride precipitates in surface layers compared with the rolled product axial zone. An increase in carbon content and a reduction in the concentration of niobium and other microalloying components within steel reduces the intensity of development of these processes. It has been shown by experiment that significant metal chemical and structural inhomogeneity forming in the continuous billet casting stage may be avoided or significantly reduced during hot rolling on the basis of controlling excess phase precipitation. This leads to a marked increase in the level of production and service properties of both hot-rolled product and metal objects prepared from it by hot stamping.
机译：详细研究了碳合金含量为0.098％至0.219％的工业熔体，这些组分在热轧过程中形成的成分和性能的再分布与化学成分与热冲压过程中的硬化钢相似。已经确定，控制这些过程的发生强度的关键生产参数是机架精轧机组中轧制开始时的温度，即T-6。与轧制产品轴向区域相比，T-6的增加导致碳含量显着富集，并且由于在表面层中形成了碳氮化铌沉淀而形成了更精细的结构。钢中碳含量的增加以及铌和其他微合金成分的浓度降低，降低了这些工艺的发展强度。实验表明，在热轧过程中，基于控制过量相的析出，可以避免或显着减少在连续坯料连铸阶段形成的明显的金属化学和结构不均匀性。这导致热轧产品和通过热冲压由其制备的金属物体的生产和服务性能水平显着提高。

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