摘要
试验用390 MPa级IF钢（/％：0.005C,0.04Si,0.35Mn,0.095P,0.005S,0.030Nb,0.016Ti,0.036Alt）0.8 mm冷轧板由4 mm热轧板冷轧生产.研究了连续退火温度780～820℃对该IF钢组织、织构和力学性能的影响.结果表明,当连续退火温度由780℃提高至820℃时,IF钢的屈服和抗拉强度分别由282 MPa和432 MPa降至249 MPa和405 MPa,伸长率A5o和塑性应变比rm分别从37.2％和1.45提高到41.7％和1.84,具有较好的深冲性能;但随退火温度升高,平面各向异性指数△r由0.44提高到0.65,铁素体晶粒尺寸增大,组织均匀变差,同时变形织构{112} 〈110〉变弱,有利织构{111} 〈110〉增强,{001} 〈110〉变弱,综合考虑退火温度控制在820℃左右为宜.
Test 0. 8 mm cold roiled sheet of 390 MPa IF steel （/% ： 0. 005C, 0.04Si, 0. 35Mn, 0. 095P, 0. 005S, 0. 030Nb, 0. 016Ti, 0. 036Ah） is cold-rolled by 4 mm hot rolled plate. The effect of continuous annealing temperature 780 ~ 820℃on structure, texture and mechanical properties of the IF steel has been studied. Results show that as continu- ous annealing temperature increases from 780 ℃ to 820 ℃, the yield and tensile strength of the IF steel decrease respec- tively from 282 MPa and 432 MPa to 249 MPa and 405 MPa, and the elongation A50 and plastic strain ratio rm increase re- spectively from 37.2% and 1.45 to 41.7% and 1.84, it has better deep-drawing property; while with increasing annealing temperature the plane anisotropie index Ar increases from 0.44 to 0. 65, grain size of ferrite increases and structure homoge- neity becomes poor, and deformation texture { 112} 〈 110 〉 is weaker, favorable texture { 111 } 〈 110 〉 is enhanced, tex- ture {001 } 〈 110 〉 weakens, comprehensively considering, the suitable annealing temperature is about 820℃. Material Index IF Steel, Continuous Annealing Temperature, Mechanical Properties, Structure, Texture
出处
《特殊钢》
北大核心
2014年第3期53-55,共3页
Special Steel
基金
北京科技计划项目"首钢高品质板材的开发及其产业化"(D07010300700701)
关键词
IF钢
连续退火温度
力学性能
组织
织构
IF Steel, Continuous Annealing Temperature, Mechanical Properties, Structure, Texture
