Peng LUO
,
Xiaolin WU
,
Kenong XIA
材料科学技术（英文）
As-cast AM60 magnesium alloy ingot with grains coarser than those of as-extruded AZ series is more liable to produce cracks under ECAD with severe shear strain. A feasible scheme of equal channel angular deformation (ECAD) for as-cast AM60 magnesium alloy ingot was proposed in this paper. The tests were conducted on Instron machine with hydraulic back-force machine. Through analysing load vs displacement curves, the effects of ECAD processing conditions on deformability and microstructure of as-cast magnesium AM60 billets were discussed. During testing, the back-force employment was helpful to keep ECAD processing more stable. And with back-force, it was observed that the number of ECAD passes in different routes could tremendously affect the deformability and microstructure of magnesium specimens. It was concluded that ECAD processing is entirely feasible for as-cast magnesium AM60 alloy under severe shear strain, and back-force employment, multi-passes deformation and lubrication of graphite paper are the factors primarily beneficial to improvement of deformability and refinement of grained structure. This work provides a way to produce magnesium alloy with fine-grained structure directly from casting ingot by ECAD technique.
关键词:
ECAD
,
null
,
null
,
null
刘文月
,
任毅
,
高红
,
张帅
,
王爽
,
张禄林
上海金属
介绍了为阿拉斯加管道工程项目所开发的高强管线钢板,具有抗大变形的性能特征,其中关键技术之一是双相组织控制.通过控轧控冷工艺获得(铁素体+贝氏体)组织的钢板:控轧后在入水冷却前进行空冷,使多边形铁素体率先在基体中析出,然后通过加强水冷强度使剩余的基体组织转变为贝氏体,从而控制钢板的强度达到X80级别.研究结果表明,开始冷却温度是关键工艺参数,对钢板性能具有决定性作用.当铁素体均匀分布时,试验钢表现出良好的综合性能.采用合适的水冷工艺,低温韧性、变形能力与强度的配合才能达到阿拉斯加项目对X80管线钢的要求.
关键词:
阿拉斯加
,
管线钢
,
X80双相钢
,
变形能力
