热处理工艺对微铌高钼H13钢组织和硬度的影响

通过扫描电镜和硬度检测,研究了热处理工艺对微铌高钼H13钢组织和硬度的影响。结果表明,H13钢在860℃退火时,细小的球状碳化物均匀弥散在铁素体基体上,球化效果明显。H13钢退火前硬度值为40.4 HRC,860℃等温球化退火后,H13钢硬度值最大,为71.2 HRC,比退火前的硬度值增大76.2%。

Metallurgical concepts for optimized processing and properties of carburizing steel

Carburized steel grades are widely used in applications where high surface near hardness is required in combination with good core toughness as well as high strength and fatigue resistance. The process of carburizing lower to medium carbon containing steel can generally provide this combination of properties and has been prac- ticed for several decades. Such steel is essential in the vehicle power-train, machines and power generation equipment. However, the increasing performance demands by such applications as well as economical considerations forced steel producers to develop better alloys and fabri- cators to design more efficient manufacturing processes. The present paper describes recent concepts for alloy design optimization of carburizing steel and demonstrates the forthcoming beneficial consequences with regard to manufacturing processes and final properties.

铌在单晶硅扩散中的行为实验分析

阐述在某些新型器件的制备过程中需要使用金属铌作为特殊材料进行微细加工工艺,因此需要评估如何控制研发线上的铌浓度,实验估计铌从单晶硅片背面扩散到正面的时间,以及扩散系数。

微铌处理550MPa热轧带钢的工艺研究

采用Gleeble3500热模拟试验机,研究了含铌Q345钢奥氏体静态再结晶行为、铌的碳氮化物在奥氏体和铁素体中的析出行为等实验,铌在钢中的强化作用机理。根据上述结论,邯钢2250热轧厂生产了以碳、锰为主要成分,并加入微量铌元素,将原热轧带钢Q345的屈服强度由345 MPa提高到550M Pa。对生产的微铌处理550 M Pa钢的组织和力学性能作了检验,在细晶强化、沉淀强化和相变强化等复合强化的综合作用下,热轧带钢屈服强度均达到550 MPa以上,塑性良好。

HRB400(Nb)钢筋的生产实践

介绍了马钢(合肥)公司钢轧厂为提升经济效益用铌铁代替钒铁生产HRB400的生产实践情况,摸索出一套合理的工艺参数,并分析了规模生产中出现的不合格品,提出了解决办法。