退火温度对700MPa级冷成形用钢组织及性能的影响  

Influence of annealing temperature on microstructure and properties of 700 MPa grade cold forming steel

作　　者：王中学[1] 赵培林[1] 孙其家[1] 路峰[1] 

机构地区：[1]莱芜钢铁集团有限公司技术中心,山东莱芜271105

出　　处：《金属热处理》2015年第3期146-150,共5页Heat Treatment of Metals

摘　　要：对屈服强度700 MPa级超高强度热轧钢带进行了700~800℃退火处理,通过光学显微镜、扫描电镜、透射电镜及性能测试对不同温度退火后试验钢的组织性能进行分析。结果表明,700~800℃两相区退火时,组织为铁素体和游离渗碳体;随退火温度升高,钢中游离渗碳体数量增加,组织均匀性提高;钢的强度和硬度急剧降低,伸长率和冲击性能提高,冷弯开裂几率降低。700 MPa grade hot rolled super high strength steel was annealed at 700-800 ℃, the microstructure and mechanical properties of the steel annealed at different temperatures were analyzed by means of optical microscope , scanning electron microscope , transmission electron microscope and performance test .The results show that when annealed at 700-800 ℃dual phases zone , the microstructure is ferrite and granular cementite .With annealing temperature raising , the number of granular cementite increase , the microstructure uniformity is enhanced , the strength and hardness sharply decrease , the elongation slowly raise and the impact toughness is improved , and the probability of cold bending crack reduces .

关 键 词：超高强钢 退火温度 组织 性能 

分 类 号：TG156.2[金属学及工艺—热处理] TG142.1[金属学及工艺—金属学]