Cu-P-Cr-Ni-Mo耐候钢形变诱导铁素体相变  

Deformation induced ferrite transformation of Cu-P-Cr-Ni-Mo weathering steel

作　　者：张春玲[1] 杨金凤[1] 孔玉婷 蔡大勇[1] 

机构地区：[1]燕山大学亚稳材料制备技术与科学重点实验室,河北秦皇岛066004

出　　处：《材料热处理学报》2015年第2期60-65,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51104130);河北省自然科学基金(E2012203137)

摘　　要：采用Gleeble-3500热模拟试验机进行单道次等温热压缩试验,分析研究了Cu-P-Cr-Ni-Mo耐候钢在不同温度、不同应变量和不同应变速率下的组织演变和铁素体晶粒细化机制。结果表明,Cu-P-Cr-Ni-Mo耐候钢在875℃变形时铁素体的析出机制为形变诱导相变(DIFT)。随应变量增加,铁素体转变量先缓慢增加后急剧增加再缓慢增加的S形曲线特征;铁素体晶粒尺寸随应变量增加而减小,当应变为1.6时,铁素体平均晶粒尺寸最小,大约为3μm。在0.01~30 s-1的应变速率下,随应变速率增加,铁素体转变量增加,铁素体晶粒尺寸减小,当应变速率为30 s-1时,铁素体平均晶粒尺寸最小,约为1.9μm。Cu-P-Cr-Ni-Mo耐候钢在875℃变形时,铁素体晶粒细化机制为形变诱导铁素体相变和铁素体的动态再结晶。Microstructure evolution and ferrite grain refinement of Cu-P-Cr-Ni-Mo weathering steel during single pass isothermal hot deformation was investigated by hot compression test on a Gleeble-3500 simulator. The results indicate that the ferrite formed during compression at 875 ℃ is induced by the deformation. With increasing strain,the transformation fraction of ferrite increases first slowly,and then rapidly and slowly again lastly,and the size of ferrite grain decreases. The microstructural analysis results show that very fine ferrite grains of 3 μm can be obtained at strain of 1. 6. With increasing strain rate,the transformation fraction of ferrite increases and the grain size of ferrite decreases. Ultrafine ferrite of 1. 9 μm is obtained at the strain rate of 30 s- 1. In addition to deformation induced transformation,dynamic recrystallization of ferrite contributes to the further refinement of ferrite grains of the Cu-P-Cr-Ni-Mo weathering steel.

关 键 词：Gleeble-3500 热压缩 形变诱导相变 铁素体细化 

分 类 号：TG142.1[一般工业技术—材料科学与工程]