摘要
为了研究冷却制度对钢板厚度方向(Z 向)组织的影响,本文作了四种类型的冷却制度的测温和轧制试验。观察了钢板的显微组织,测定了硬度值。轧制道次间短时强冷十轧后常规冷却的复合冷却的钢板表层显微组织细小,心部显微组织粗大。但 Z 向硬度较均匀。轧后先弱冷后强冷却的复合冷却或轧后单一冷却速率的间断冷却的复合冷却的钢板 Z 向显微组织都较均匀,硬度差也较小。轧后单一冷却速率的常规冷却对一定厚度的钢板,冷却速率越大,得到的 Z 向显微组织越不均匀,Z 向硬度差也越大。
To analyse effects of cooling regime on Z-direction structure,the thermometric and roilingtests of four cooling regimes are mentioned in this article.Micro-structure of steel plate was obser-ved and Z-dircction hardness values were measured.Results of the test are summarized as follows:1.Under transient and forced cooling between rolling passes combined with conventional after-trolling cooling regime,the microstructure of plate surface layer is fine.while the microstructurein central part is very coarse.But the hardness along Z-direction is rather uniform.2.Under after-rolling low-high combined cooling regime,or interrupted after-roiling coolingof single cool-down speed,the micro-structure of Z-direction is rather uniform and the hardnessdifference is rather limited.3.When using conventional cooling regime with single cool-down speed after-roiling,for platewith a certain thickness,the greater the cool-down speed the larger the nonuniformity of micro-structure and the hardness difference in Z-direction.
出处
《钢铁》
CAS
CSCD
北大核心
1990年第6期42-46,共5页
Iron and Steel
