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
收藏
页码：397 / 401
页数：5
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