预应变量对超低碳烘烤硬化(ULC-BH)钢硬化性能的影响  

Effect of Prestrain on Bake Hardening property of Ultra-Low Carbon Bake Hardening(ULC-BH) Steel

作　　者：杨晰[1] 李维娟[1] 金晓龙[1] 孙成钱[2] 

机构地区：[1]辽宁科技大学材料与冶金学院,鞍山114051 [2]鞍钢股份公司技术中心,鞍山114009

出　　处：《特殊钢》2014年第1期61-64,共4页Special Steel

基　　金：国家自然科学基金资助(51274121)

摘　　要：测定了ULC-BH钢1 mm退火冷轧钢板(/%:0.002C,0.008Si,0.60Mn,0.043P,0.009S,0.031Al,0.071Ti)经2%~10%预应变,170℃20 min烘烤后的烘烤硬化(BH)值,通过内耗实验获得不同应变时效下的内耗谱线,利用X射线衍射技术测定位错密度,研究了Cottrell气团对ULC-BH钢烘烤硬化性能的影响。结果表明,随预应变量增加,ULC-BH钢的BH值增大;随预应变量增加,Snoek峰逐渐降低,而SKK峰逐渐升高;经2%、6%和10%预应变,位错密度增大,分别为3.9×10^(10)/cm^2,8.4×10^(10)/cm^2和6.8×10^(11)/cm^2,相应的Cottrell气团密度逐渐减小。The bake hardening values （BH） of ULC-BH steel lmm annealed cold roiled sheet （/%： 0.002C, 0. 008Si, 0. 60Mn, 0. 043P, 0. 009S, 0. 031A1, 0. Ol7Ti） with prestraining by 2% - 10% and baking at 170 ℃ for 20 rain have been measured, and the effect of Cottrell atmosphere on bake hardening property of ULC-BH steel is studied by internal friction test getting internal friction spectrum curves at different strain ageing and using X-ray diffraction technique measuring dislocation density. Results show that with increasing prestrain the BH value of ULC-BH steel increases; and with increasing prestrain the Snoek peak gradually reduces while SKK peak gradually raise; with prestraining by 2% , 6% and 10% the dislocation density increases, and that respectively are 3.9 × 1010/cm2, 8.4 × 1010/cm2 and 6. 8 × 1011/cm2, while corresponding Cottrell atmosphere density gradually decreases.

关 键 词：预应变 超低碳烘烤硬化钢 烘烤硬化值 Cottrell气团 位错密度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]