摘要
通过对GJW50合金（配料成分为wt％：50WC、0．25C、0.50Cr、0．25Mo，余量为Fe）1020℃＋200℃等温淬火态与1020℃淬火＋200℃回火态组织形态与断口形貌的观察、残余奥氏体量与力学性能的测定，探讨了等温马氏作的形成机制，并研究了马氏体等温淬火对该合金强韧性的影响。结果表明，在200℃等温过程中剩余奥氏作中先析出ε碳化物，尔后形成细晶马氏体。1020℃＋200℃等温淬火态的残余奥氏作量显著多于1020℃淬火＋200℃回火态；前者的HRC，σbb与ak值均高于后者，但kIC值略低于后者。
The isothermal Transformation mechanism of martensite of GJW50 alloy (WB% of gradAnts: 50Wc, o,25C, 0. 50C r, 0. 2 5 M o,rernaining Fe) has been investigated, and the effcct of isothermal hardening ofmartensite on strength and toughness of this alloy has been studied throught observing the structures andfractures and measuring the content of residual ausdrite and testing the mechanical propertes in thetsothermlly hardened states at 200℃ after astenitinng at 1020℃ and quenched 1020℃ and tempered at200℃. The results show that scarbides fust precipitate from the residudl ausdrite during isotherxal at200℃, and then the fine martensites are formed. The residual austenits in the state tsothermallyhardened at 200℃ is obviously more than that quenched from 1020℃ and tempered at 200℃,and the HRC and σbb and ak of the former are all hiqher than the latter, but the Kic of theformer is slightly lower.
出处
《材料科学与工艺》
EI
CAS
CSCD
1997年第3期58-61,共4页
Materials Science and Technology
关键词
等温马氏体转变
力学性能
GJW50合金
Isothermal martensitic transformation
mechanical property
fine isothermal martensite
remain austenite
