退火工艺对冷轧低碳钢组织和性能的影响研究  

Effect of Annealing Process on Microstructure and Properties of Cold Rolled Low Carbon Steel

作　　者：孟子琪 李红斌 于琳琳[2] 杜冰[2] 

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063009 [2]燕山大学机械工程学院,河北秦皇岛066004

出　　处：《热加工工艺》2016年第12期179-182,186,共5页Hot Working Technology

基　　金：河北省钢铁联合基金项目(E2015209243);秦皇岛市科学技术研究与发展计划项目(201502A025)

摘　　要：采用冷轧技术对带钢进行了多道次常规冷轧,试件原始厚度为2.5mm,轧后厚度为0.4mm,总压下量为84%。然后对试件进行了不同温度和不同保温时间的退火,进行了显微组织观察,并进行硬度试验和拉伸试验。结果表明:冷轧退火后的带钢力学性能和微观组织与退火工艺有关。轧制后,晶粒明显拉长,出现了新的晶粒;退火过程中,随着退火温度增加,平均晶粒尺寸减小,且观察到了较小尺寸的亚晶;而带钢的强度和硬度不断下降,塑性和韧性得到改善。最佳退火温度为550℃,最佳保温时间为1 h。The conventional multi-pass cold rolling of the strip steel was carried out by cold rolling technology. The original thickness of the test-pieces was 2.5 mm, the thickness after the rolling was 0.4ram, and the total reduction was 84%. Then the test-pieces were annealed at different temperatures and different holding time. The microstructure was observed. And the hardness test and tensile test were carried out. The results show that the mechanical properties and microstructure of cold rolled annealed strip steel are related to the annealing process. After rolling, the grains are elongated and the new grains appear; in the annealing process, with the increase of annealing temperature, average grain size decreases, and the subgrains of small size are observed; the strength and hardness of the strip continuously decreases, and plasticity and toughness are improved. The best annealing temperature is 550 ℃, and the best holding time is 1 h.

关 键 词：低碳带钢 退火 保温时间 再结晶 组织 

分 类 号：TG156.2[金属学及工艺—热处理]