摘要
θCr18Ni9、φ1000×5封头冷压成型时发生破裂,其冲裂率达46%,直接经济损失15000余元。本文分析了破裂原因,论证了热轧状态的不锈钢板由于碳化物沿晶界、晶内呈串链状析出,显微组织呈带状分布,使材料强度、硬度提高,塑性下降,更主要的使材料的力学性能各向异性,因而不能直接用于冷压封头。文中提供了适用于冷压封头不锈钢板的技术条件。
The cracking of 0Cr18Ni9 seal cap φ1000×5mm was occurred during cold forming. Six of the thirteen caps pressed were cracked, the cracking rate was up to 46% and the direct economic loss was more Than 15000 yuan. This paper analyzes the cracking cause by the conventional mothods such as: fracture analysis, physical testing, chemical analysis and heat treatment testing, etc. It demonstrates that the hot rolled stainless steel plate can not be directly applied to cold forming, because the microstructure takes on a zonal chain like distribution, as the carbides are precipitated along the austenitic grain boundaries and granular interior. It makes the strength and hardness of the material rise greatly, but the plasticity is reduced. At the same time, it makes the mechanical propterties of the material anisotropic. The technical specification of stainless steel used for seal cap cold forming is proposed.
出处
《机械工程材料》
CAS
CSCD
1990年第1期60-63,共4页
Materials For Mechanical Engineering
