热变形对高铌X80管线钢连续冷却转变曲线的影响  

Effect of hot deformation on continuous cooling transformation curves of high-Nb X80 pipeline steel

作　　者：于建国[1] 吴静然[1] 李大伟[1] 王晶[2] 肖福仁[3] 

机构地区：[1]承德石油高等专科学校机械工程系,河北承德067000 [2]承德石油高等专科学校工业中心,河北承德067000 [3]燕山大学材料科学与工程学院,河北秦皇岛066004

出　　处：《金属热处理》2013年第7期73-77,共5页Heat Treatment of Metals

基　　金：国家自然科学基金(51171162)

摘　　要：用Gleeble-3500热模拟试验机测定了一种高Mn、高Nb X80管线钢连续冷却转变(CCT)曲线,研究热变形对连续冷却相变行为的影响。结果表明:变形可以促进多边形铁素体和珠光体相变,抑制针状铁素体相变,同时可以提高相变温度,细化相变组织。变形及冷却过程中Nb(C,N)的析出,降低了奥氏体的稳定性,加速相变,但抑制铁素体晶粒长大,细化室温组织。Continuous cooling transformation （CCT） curves of a high-Mn Gleeble-3500 thermal mechanical simulator, furthermore, the effect of hot and high-Nb X80 pipeline steel were constructed by means of deformation on continuous cooling transformation behaviors was researched. The results show that hot deformation can promote the polygonal ferrite （PF） and pearlite （P） transformation and delay acicular ferrite （AF） phase transformation. Meanwhile, the hot deformation can increase the phase transformation temperature, and refine the microstructure. The precipitates of Nb（ C, N） during deformation and cooling process can decrease the stability of austenite, accelerate the transformation, restrain the grain growth of ferrite and refine the final microstructure.

关 键 词：X80管线钢 针状铁素体 连续冷却转变 热变形 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG406[金属学及工艺—金属材料]