辅助烘烤硬化的双相钢的显微组织工程

IF 1.9 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
M. K. Banerjee
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引用次数: 3

摘要

. 将成分为0.05C ~ 0.18 Mn ~ 0.012 Si的低碳钢在750℃、775℃和800℃下进行临界退火,将不同碳含量、不同奥氏体含量的平衡合金在冰水中淬火。同样的合金在675℃和700℃下进行不同时间的亚临界退火;亚临界退火合金试样在冰水中淬火。对所有样品进行了光学、扫描电子和透射电子显微镜检查。研究了上述制备的双相铁素体马氏体钢的位错组织、分布和密度。发现马氏体由于晶格不变性而高度位错。与此同时,邻近马氏体区的铁素体也表现出相当高的位错密度。高的位错密度有利于应变时效,因此具有良好的淬透性。对马氏体相和铁素体相进行了EDS分析;铁素体的过饱和程度和马氏体的含碳量随工艺参数的变化而变化。显微硬度测试结果表明,不同工艺参数下,不同相的硬度值差异较大。显微组织和相应的显微分析表明,不同工艺的钢含有不同成分和不同分布的相。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microstructural engineering of dual phase steel to aid in bake hardening
. Low carbon steel of composition 0.05C – 0.18 Mn – 0.012 Si is intercritically annealed at temperatures 750 o C, 775 o C and 800 o C. The equilibrated alloys of different amounts of austenite with varying carbon contents are quenched in iced water. The same alloys are subcritically annealed at 675 o C and 700 o C for varying periods of times; the subcritically annealed alloy samples are quenched in iced water. Optical, scanning electron and transmission electron microscopy are carried out for all the samples. The dislocation structure, its distribution and density present in the above prepared duplex ferrite martensite steels are studied. The martensites are found to be highly dislocated due to lattice invariant deformation. At the same time ferrite adjoining the martensite areas also exhibits quite a high dislocation density. The high dislocation density is favorable for strain ageing and hence bakes hardenability. EDS analyses were carried out for both martensite and ferrite phases; it is found that the degree of supersaturation in ferrite together with carbon content in martensite varies with the process parameters. The microhardness test results show that the hardness values of different phases differ appreciably with process parameters. The microstructures and the corresponding microanalyses reveal that differently processed steels contain phases of varying compositions and different distribution.
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来源期刊
Advances in Materials Research-An International Journal
Advances in Materials Research-An International Journal MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
3.50
自引率
27.30%
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