P.Ch
材料科学技术（英）
Duplex stainless steels are gaining global importance because of the need for a high strength corrosion resistant material. Three compositions of this group were selected with three different nitrogen contents viz, 0.15 wt pct (alloy 1), 0.23 wt pct (alloy 2) and 0.32 wt pct (alloy 3). The steels were melted in a high frequency induction furnace and hot forged to various reductions from 16% to 62%. In this work, the effect of hot forging on the ferrite content, hardness, yield strength, impact strength and grain orientation (texture) were studied. Fracture analysis on all the forged specimens using SEM reveals that a size reduction of 48% results in maximum ductility and impact strength as well as minimal ferrite content and grain size. Thus the mechanical properties are found to have a direct correlation to ferrite content and grain size. The highest impact strength was observed in specimens with the smallest grain size, which was observed in specimens forged to 48% reduction in size.
关键词:
Duplex
,
Austenite
,
Ferrite
,
Forging
,
Soluti
许柳
,
鲍思前
,
赵刚
,
陈建徽
,
吴浩
上海金属
在Gleebe-1500热力模拟机上,采用单道次热压缩实验,研究了不同变形速率和不同变形温度下弹簧钢50CrV4的动态再结晶行为.结果表明:钢种在较高温度和较低应变速率下,动态再结晶更容易发生.采用回归法计算出动态再结晶的变形激活能和应变指数分别为378.612 kJ/mol和4.92,由此建立动态再结晶峰值应变、稳态应变和临界应变模型.
关键词:
弹簧钢50CrV4
,
奥氏体
,
动态再结晶
,
应力-应变曲线
卢艳平
,
楼鹏飞
上海金属
为解决高镍奥氏体无磁辊材料X5NiCrTi2615MoAlVB在以往热处理工艺下硬度不高等问题,通过分析X5NiCrTi2615MoAlVB的成分,研究合金元素在材料中的作用,并利用Jamatpr05.0软件进行相图计算,从而设计并试验得到适合该材料的最佳热处理工艺为:1000℃×2h固溶后水冷+760℃×12 h时效后空冷,最终有效地改善了高镍奥氏体无磁辊材料组织和性能.
关键词:
高镍无磁辊
,
奥氏体
,
热处理
,
磁性能
S.J. Yao
,
L.X. Du
,
X.H. Liu
,
G.D. Wang
金属学报(英文版)
Three warm-rolled ferrite/pearlite microstructures
were prepared by rolling at 500℃, and the austenitizing
characteristics were discussed in conjunction with deformation
during the heating stage. The results indicated that the final
austenite grain size was sensitive to the deformation direction of
the initial warm-rolled microstructure. The transient microstructure
at a given temperature was the most important influencing factor on
the austenitizing characteristic combined with deformation.
Moreover, the hot-rolled microstructure also had to be prepared in
an optimal state because of its direct effect on the warm-rolled
microstructure.
关键词:
Warm-rolled ferrite/pearlite
,
null
,
null
