FeMnAlC低密度钢中κ-碳化物形成机理

doi:10.13251/j.issn.0254-6051.2021.12.001

摘要/Abstract

摘要： FeMnAlC钢是一种新型的高强低密度钢,较高的合金元素含量使其组织性能具有较大的调控空间。κ-碳化物是钢中特有析出相,其析出位置和大小对FeMnAlC钢的性能有极大影响,合理地调控κ-碳化物的析出可以有效地提高钢的强度,并具有较高的塑性和韧性。对FeMnAlC钢中κ-碳化物的形成机理进行总结,并结合不同冷速和短时时效试验探究κ-碳化物的形貌特征以及调控方法。结果表明:κ-碳化物调幅分解产生,结构与基体共格,会随着时效时间的延长和温度的提高粗化。Si、Ni元素会促进κ-碳化物析出,Mo、Cr等元素会抑制κ-碳化物析出。

关键词: κ-碳化物, FeMnAlC钢, 低密度钢, 调幅分解, 有序化

Abstract: FeMnAlC steel is a new type of high strength and low density steel. The high content of alloying elements makes the microstructure and properties of the FeMnAlC steel have a large regulatory space. κ-carbide is a unique precipitated phase in the steel, and its precipitation position and size have a great influence on the properties of the FeMnAlC steel. Reasonable regulation of κ-carbide precipitation can effectively improve the strength of the steel, and with high plasticity and toughness. The formation mechanism of κ-carbide in the FeMnAlC steel was summarized, and the morphology characteristics and control methods of κ-carbide were explored by combining different cooling rates and short-term aging tests.The results show that the κ-carbide is generated by spinodal decomposition, and the structure is coherent with the matrix, which will coarsen with the extension of aging time and the increase of temperature. Si and Ni elements will promote the precipitation of κ-carbide, and Mo, Cr and other elements will inhibit the precipitation of κ-carbide.

Key words: κ-carbide, FeMnAlC steel, low density steel, spinodal decomposition, ordering

中图分类号:

TG142.1

曹晨星, 王存宇, 曹文全. FeMnAlC低密度钢中κ-碳化物形成机理[J]. 金属热处理, 2021, 46(12): 1-6.

Cao Chenxing, Wang Cunyu, Cao Wenquan. Formation mechanism of κ-carbide in FeMnAlC low density steel[J]. Heat Treatment of Metals, 2021, 46(12): 1-6.

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