工程科学学报2017，Vol.39Issue(9)：1364-1371,8.DOI:10.13374/j.issn2095-9389.2017.09.009
铸坯取样位置对经济型双相不锈钢2101热塑性的影响
Influence of the sample position of the cast on the thermoplasticity of lean duplex stainless steel 2101
摘要
Abstract
To understand the reasons behind edge cracks of large-scale cast ingot during hot deformation, this paper compared the compositions, phase ratios at different temperatures, and differences in the hardness of two phases in the middle and edges of cast ingots. The microstructure and fracture morphology of the samples were observed by optical microscopy, scanning electron microscopy, and electron back-scattered diffraction. The results indicate the presence of smaller grains and larger ferrite content in the edge portion than in the middle. However, edge cracking is also more serious than middle cracking, which indicates that grain size and phase proportion are not the main factors influencing the side cracking of ingots. Compared with that of the middle portion, the hardness difference between the two phases of the ingot edge is larger. Thus, the strain distribution of the two phases varies during hot deforma-tion, and stress concentration occurs along the phase boundary. More precipitates are observed in the phase boundary of the ingot edge than in that of the middle specimens, and these precipitates are believed to destroy the continuity of the matrix, leading to microc-racks.关键词
经济型双相不锈钢/热塑性/相比例/硬度差/取样位置Key words
lean duplex stainless steel/thermoplasticity/phase ratio/hardness difference/sample position分类
矿业与冶金引用本文复制引用
冯志慧,李建兴,李静媛,王一德..铸坯取样位置对经济型双相不锈钢2101热塑性的影响[J].工程科学学报,2017,39(9):1364-1371,8.基金项目
国家重点研发计划资助项目(2016YFB0300200) （2016YFB0300200）
国家自然科学基金资助项目(U1660114) （U1660114）
