配分温度对低碳高强Q&P钢组织及力学性能影响  

Effect of partitioning temperature on microstructure and mechanical properties of low carbon high strength Q&P steel

作　　者：陈连生[1] 杨栋[1] 田亚强[1] 宋进英[1] 魏英立[1] 赵远[1] 

机构地区：[1]河北联合大学河北省现代冶金技术重点实验室,河北唐山063009

出　　处：《材料热处理学报》2014年第1期55-59,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金项目(51254004);河北省高等学校科学技术研究项目(YQ2013003)

摘　　要：采用光学显微镜、场发扫描电镜和X射线衍射仪研究了配分温度对低碳高强Q&P钢的组织演变规律,并分析了配分温度对其力学性能和残留奥氏体含量的影响。结果表明:实验用钢0.20C-1.28Mn-0.37Si经过Q&P处理后,随着配分温度的升高,其抗拉强度逐渐降低,伸长率先升高后降低,在配分温度400℃时,强塑积达到最大22610 MPa·%;随配分温度的升高,析出的碳化物开始聚集长大,并消耗了马氏体中扩散的碳,使残留奥氏体的含量降低,残留奥氏体含量在400℃时达到最大的体积分数5.3%,试样拉伸断口形貌具有典型的韧窝状特征。Effect of partitioning temperature on microstructure evolution, mechanical properties and retained austenite content of low carbon high strength Q＆P steel 0. 20C-1.28Mn-0. 37Si was studied by means of optical microscope, scanning electron microscopy and X-ray diffraction. The results show that with the partitioning temperature increasing, the tensile stress strength of the experimental steel decreases gradually and the elogation of the steel increases at first and then decreases after Q＆P processing. When partitioning temperature at 400 ℃ , product of strength and ductility reaches the maximum 22610 MPa＇%. With the partitioning temperature increases, the precipitated carbide starts aggregation and growth and consumes the carbon diffusion from martensite, reducing the retained austenite content, retained austenite reaches the maximum volume fraction of 5.3% at 400 ℃. The morphology of tensile fracture surface of the Q＆P steel appears a typical dimple fracture.

关 键 词：配分温度 Q&P钢 组织性能 残留奥氏体量 

分 类 号：TG142.4[一般工业技术—材料科学与工程]