摘要
通过Gleeble-3500高温模拟试验机对Q460C钢种高温塑性区间进行了测定,深入分析了Q460C钢的高温断裂机理,确定了最佳的铸坯矫直区间。研究表明:600℃~800℃为Q460C钢的低温脆性区,在该区间断裂形式以混合断裂为主;900℃~1 050℃塑性最好,断面收缩率在85%以上,此时的断裂形式为韧性断裂;在1 050℃~1 250℃拉伸时断面收缩率有所降低,但仍在75%以上,通过对其断口分析发现其主要原因是Nb(CN)的沉淀析出造成。
High temperature fracture mechanism of Q460C steel is determined by Gleeble-3500 high temperature simulation test machine,the high temperature fracture mechanism of Q460C steel is analyzed,the optimum straightening interval is determined.Research shows that,the fracture mode is given priory to mixed fracture between 600℃~800℃ which is low temperature brittleness zone of Q460 C steel;The fracture mode is ductile fracture between 900℃ ~1 050℃ in which the plastic is best and reduction area is above 85%;The reduction area is reduced between 1 050℃~1 250℃during stretching,but still above 75%,it is found that the main cause of this phenomenon for the precipitate out of Nb（CN） based on the fracture analysis.
出处
《河南冶金》
2017年第4期5-7,38,共4页
Henan Metallurgy
关键词
Q460C
高温拉伸
塑性变形
拉伸断口
Q460C
high temperature tensile
plastic deformation
tensile fracture
