摘要
对三种不同缺口尺寸的16MnR钢试样(3V,3I和3C)在-110℃和1～500mm/min的加载速率范围内进行了三点弯曲断裂试验。发现应力集中和塑性拘束度按3V,3I和3C依次增大的三种试样,其断裂行为敏感的加载速率范围按1～120mm/min,1～60mm/min和1～30mm/min依次降低。在敏感的加载速率范围内,断裂模式随加载速率的增加由延 脆转变断裂迅速转变为全脆性解理断裂,韧性随之迅速降低。在超出敏感速率范围的较高速率范围内,三种试样的断裂行为对加载速率不敏感,断裂模式保持为全脆性解理断裂,韧性较低,并基本不随加载速率变化。
The threepoint bending tests are carried out at -110℃ and various load rates of V=1～500mm/min for three types of specimens (3V, 3I and 3C) with different notch sizes. It has been found that with increasing stress concentration and plastic constraint for the 3V, 3I and 3C specimens, the sensitive loading rate range of fracture behavior is decreased from 1～120mm/min(3V) through 1～60mm/min(3I) to 1～30mm/min(3C), and in the sensitive loading rate range the fracture model is rapidly changed from the ductile-brittle transition fracture to brittle cleavage fracture and the toughness is rapidly decreased. In the higher loading rate range over the sensitive range, the fracture behavior of the three specimens is not sensitive to loading rate; and the brittle cleavage fracture model remains; and the toughness is lower and does not essentially change with loading rate.
出处
《理化检验（物理分册）》
CAS
2003年第10期495-499,共5页
Physical Testing and Chemical Analysis(Part A:Physical Testing)
基金
兰州理工大学省部共建有色金属新材料国家重点实验室开放基金
国家自然科学基金(59871015)资助
关键词
缺口尺寸试样
断裂
加载速率
敏感性
钢
韧性
扫描电镜分析
Specimens with different notch size
Fracture
Loading rate
Toughness
Sensibility
Steel
