中南大学学报（自然科学版）2025，Vol.56Issue(12)：5015-5024,10.DOI:10.11817/j.issn.1672-7207.2025.12.007
Q1100钢焊接再热粗晶区组织性能和再热奥氏体相变晶体学研究
Study on microstructure and properties of reheated coarse grain zone of Q1100 steel and crystallography of reheated austenite phase transformation
摘要
Abstract
The coarse grain heat affected zone(CGHAZ)and reheated CGHAZ samples of Q1100 ultra-high strength steel were prepared by Gleeble 3800 thermal simulator.The microstructrue and mechanical properties of the samples were characterized through scanning electron microscopy(SEM),electron backscatter diffraction(EBSD),Charpy impact tests and microhardness tests.In addition,the phase transformation crystallography of reheated austenite in CGHAZ during the inter-critical reheating process was systematically studied.The results show that the CGHAZ samples are coarsened and form chain-like MA components when reheated at 800℃.At this temperature,the hardness is low(311.8(HV))and the impact energy is the lowest(17.5 J).When the sample is reheated at 850℃,the grain coarsening phenomenon is aggravated,the block MA component is decomposed,the hardness is the lowest(298.2(HV))and the impact energy increases.When the sample is reheated at 900℃,the microstructure is similar to that of CGHAZ,but the grain is refined,and the hardness and impact energy are the highest.During the intercritical reheating process,austenite transforms according to the K-S relationship at the prior austenite grain boundaries(PAGBs)on one side of the prior austenite grains(γp),with no clear crystallographic relationship evident on the opposite side of γp.When the intercritical reheating temperature is 800℃,the austenite grows to γp on the side without K-S relationship.When the temperature rises to 850℃,austenite grows to both sides at the same time.关键词
Q1100/超高强钢/再热粗晶热影响区/再热奥氏体/相变晶体学Key words
Q1100/ultra-high strength steel/reheated coarse grain heat affect area/reheated austenite/crystallography of phase transformation分类
矿业与冶金引用本文复制引用
刘文鉴,李红英,梁亮,肖爱达,张永林,曾威民,高擎,杜江..Q1100钢焊接再热粗晶区组织性能和再热奥氏体相变晶体学研究[J].中南大学学报（自然科学版）,2025,56(12):5015-5024,10.基金项目
长株潭国家自主创新示范区专项(2018XK2301)(Project(2018XK2301)supported by the Chang-Zhu-Tan National Independent Innovation Demonstration Zone) （2018XK2301）
