高强度低碳贝氏体钢拉伸断口分离现象模拟分析  

Simulation Analysis of Tensile Fracture Separation of High Strength Low Carbon Bainitic Steel

作　　者：张淑华[1] 修文翠[1] 

机构地区：[1]吉林农业科技学院,吉林吉林132101

出　　处：《铸造技术》2013年第12期1634-1636,共3页Foundry Technology

摘　　要：以800 MPa级高强度低碳贝氏体钢为对象,实验研究了拉伸断口分离的解理特征,通过计算机模拟研究了颈缩区侧向拉伸应力对拉伸断口分离的影响。结果表明,低碳贝氏体钢的拉伸断口分离属于脆性解理型断裂,且分离面方向和轧面平行;拉伸断口分离产生是因为颈缩区严重形变造成的,而且和材料形态演变、贝氏体单元尺寸以及材料织构有关,同时,颈缩形状造成的三向拉伸应力也是导致材料由塑性到脆性转变的因素。Taking 800 MPa grade high strength low carbon bainitic steel as an object to study the characteristic of the cleavage fracture separation in experiments, the effects of lateral tensile stress in necking zone on tensile fracture was analyzed by computer simulation sottware. The results show that the tensile fracture separation of low-carbon bainitic steel belongs to brittle cleavage fracture, and the direction of separation plane is parallel to the rolling surface; the tensile fracture separation results from the severe deformation in necking zone, and has a relationship with morphological evolution of materials, cell size of bainite and material＇s texture; the three-directional tensile stress caused by necked shape also is a factor resulting in brittle transition of the material from plastic.

关 键 词：低碳贝氏体钢 计算机模拟 拉伸断口分离 

分 类 号：TG142.15[一般工业技术—材料科学与工程]