论文部分内容阅读
本文研究了一种新型的相间沉淀钢。试验结果表明：在奥氏体直接分解过程中，单纯用ＶＣ产生相间沉淀，很难获得强度与韧性的最佳配合，也难直接在热轧或正火状态下使用。在Ｆｅ－Ｖ－Ｃ基础上添加适当的锰和铝，连续冷却时可使σ＿ｓ＞５５０ＭＰａＣＶＮ（室温）＞１６０Ｊ。对φ２００ｍｍ以下的棒材，空冷时能获得均一的组织与性能。如欲获得更高强度，可藕回火改善韧性。与低碳贝氏体钢比较，在相同强度下有更高的韧性与低的相间沉淀临界冷速。预期有较大的应用前景。本文还详细研究了相间沉淀钢的组织、转变动力学；对强度与韧性的控制因素也作了进一步探讨。
In this paper, a new type of interphase precipitation of steel. The experimental results show that it is very difficult to get the best strength and toughness by simply producing the interphase precipitation with VC in the process of direct austenite decomposition, and it is hard to use it directly in hot rolling or normalizing condition. Appropriate manganese and aluminum are added to the Fe-V-C and σ_s> 550MPaCVN (room temperature)> 160J with continuous cooling. For φ200mm below the bar, air cooling can get uniform organization and performance. If you want to get higher strength, lotus back to improve the toughness of the fire. Compared with low-carbon bainitic steels, the alloy has higher toughness and lower critical cooling rate at the same strength. Expected to have greater application prospects. In this paper, the microstructure and transformation kinetics of interphase precipitated steels were also studied in detail. The control factors of strength and toughness were further discussed.