摘要
本文通过热处理、示波冲击、光镜、扫描电镜和透射电镜对３５ＳｉＭｎＭｏＶ钢的多相纤维状复合组织、马氏体加铁素体纤维状双相组织和以粒状贝氏体为主的夏合组织，进行了力学性能对比和冲击断口形貌、复合组织形态的观察；研究了不同复相组织的裂纹萌生功与扩展功；并测定了组织中的奥氏体体积分数。结果表明：前者在低温回火或未回火状态下，与调质态的纤维状双相组织和回火态的粒状贝氏体复会组织相比，在等强度下，具有更高的冲击能量和更优异的强韧性配合。多相复合组织具有高的裂纹萌生功。随冲击功提高，裂纹扩展功增加，萌生功与扩展功逐渐接近相等。
he martensite bainite,ferrite plus austenite fibrous multiphase complex structure,fibrous martensite plus ferrite dual- phase structure and granular bainit complex structure were ob-tained by heat treatment.The ccmparison was made inimpact energy, hardeness,strength be-tween the different complex structures.The crack initiation and propagation energy of diffe-rent complex Structures were analysed by means of electronic oscillograph.The fracture sur-face of impact specimen and complex structure morphology were observed and the volume per-centage of austenite was surveyed by optical microscope,scanning and transmission electron microscope,X-ray diffractometer.The results show that the fibrous multiphase complex struc-ure quenched or at low temperature tempered possesses higher impact energy and better combination of strength and toughness than that of the fibrous dual-phase structure quenched at high temperatnre tempered and the tempered granular bainite complex structure,when they are with same strength.The results indicate also that the multiphase complex structure is of kigh crack initiation energy. The crack propagation energy increases and is gradually equal to the initiation energy with the increase of the impact energy.
出处
《钢铁》
CAS
CSCD
北大核心
1994年第1期37-41,71,共6页
Iron and Steel
