新型贝氏体渗碳钢伪渗碳组织和力学性能的研究

Study on Pseudo-carburizing Microstructure and Mechanical Properties of New-type Bainite Carburizing Steel

采用不同的伪渗碳热处理工艺,研究了新型贝氏体渗碳钢的组织和力学性能及工业渗碳试验非渗层的组织。结果表明,常规正火热处理和不同的伪渗碳热处理后贝氏体渗碳钢具有良好的强韧性配合,伪渗碳工艺实验材料的组织和渗碳工艺中非渗层组织没有出现过分长大及粗化的情况。920℃×10h降温至880℃空冷+680℃空冷+加热880℃空冷+200℃回火伪渗碳处理和渗碳热处理,实验材料才可获得良好的强韧性。

The microstructure and mechanical properties of the new type bainite steel were studied by different pseudo-carburizing processes and the microstructure abtained by industrialized carburizing was also studied.The results show that carburizing bainite steel has better combination of strength and toughness by normalizing heat treatment and different pseudo-carburizing heat treatment,the microstructure obtained by pseudo-carburizing process and non-carburized layer in carburizing treatment has not excessive grain growth and grain coarsening,the testing material has better strength and toughness by pseudo-carburizing and carburizing treatment at 920℃×10h＋880℃×1h air-cooling＋680℃×3h air-cooling＋ 880℃×1h air-cooling＋200℃ tempering.