SONG Ren-bo
,
XIANG Jian-ying
,
HOU Dong-po
钢铁研究学报(英文版)
A comparative study on mechanical properties and microstructure of 316L austenitic stainless steel between solution treated specimen and hot rolled specimen was conducted. After a specimen was subjected to solution treatment at 1050 ℃ for 6 min, its mechanical properties were determined through tensile and hardness tests. Based on the true stress vs true strain and engineering stress vs engineering strain flow curves, the work hardening rate has been explored. The results show that the solution treated specimen has an excellent combination of strength and elongation, and that this steel is easy to work-hardening during deformation. Optical microscope, scanning electron microscope, transmission electron microscope and X-ray diffraction examinations were conducted, these reveal that twins in 316L austenitic stainless steel can be divided into suspended twin and transgranular twin which have different formation mechanisms in growth, and that the deformation induced martensite nucleated and grown in the shear band intersections can be observed, and that the fracture surfaces are mainly composed of dimples and exhibit a tough fracture character.
关键词:
316L
,
mechanical property
,
twin
,
martensite
,
fracture morphology
宿成
,
董方
钢铁
为了研究含V、Ti、Nb微合金Q345B结构钢的高温塑性，利用Gleeble-1500D热模拟试验机对其进行热拉伸试验，分析了在应变速率为1.5×10－3s-1、变形温度700~1300℃（Δt=100℃）变形条件下的断裂强度和断面收缩率随温度的变化情况。确定Q345B结构钢存在两个脆性区间，即第Ⅰ脆性温度区间为熔点温度1300℃，第Ⅲ脆性温度区间为850~740℃。通过扫描电镜和光学显微镜对断口形貌及其组织进行了观察，明确了断裂原因，为连铸生产提供一定的理论指导。
关键词:
微合金钢
,
high temperature plasticity
,
fracture morphology
