Effects of Co and Ni on secondary hardening and fracture behavior of martensitic steels bearing W and Cr

被引：31

作者：

Kwon, H ^{[1
]}

Kim, CM

Lee, KB

Yang, HR

Lee, JH

机构：

[1] Kookmin Univ, Dept Mat & Met Engn, Seoul 136702, South Korea

[2] Kookmin Univ, Ctr Adv Aerosp Mat, Seoul 136702, South Korea

[3] Korea Gas Corp, R&D Training Ctr, Ansan 425150, Kyunggi Do, South Korea

[4] Inchun Jr Coll, Dept Mech Engn, Inchun 402750, South Korea

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1998年 / 29卷 / 01期

关键词：

D O I：

10.1007/s11661-998-0191-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effects of Co and Ni on the secondary hardening and fracture of martensitic steels bearing W and Cr were studied. For the W-Cr-Co steel, the 14Co addition increased the hardness and resulted in a severe decrease in toughness of the matrix. For the W-Cr-Co-Ni steel, the 10Ni addition accelerated the secondary hardening and improved the overall impact toughness. The fractograph showed mostly intergranular fracture at 425 °C and 475 °C. The loss of impact toughness is tempered martensite embrittlement due to impurities and coarse cementite at the grain boundaries. Ni addition plays a dual role in additionally increasing the toughness through removal of the coarse cementite and through an increase in cleavage resistance.

引用

页码：397 / 401

页数：5