quasi-cleavage fracture

SEM analysis shows that alloy rupture changes from quasi-cleavage fracture to ductility fracture .

拉伸断口SEM形貌分析表明，合金断裂方式由准解理断裂向韧性断裂发生转变。

According to analysis result of tubes ' cracks fracture observation , it proves that the fracture is quasi-cleavage fracture which is characterized by river pattern .

通过对管束大量电子断口的观察分析，证明了断口为准解理断裂，具有河流花样的特征。

An investigation of quasi-cleavage fracture in steel

准解理断裂的本质

The fracture of the former is quasi-cleavage fracture and its brittleness gradually disappears with temperature increase .

但此脆性不同于马氏体的回火脆性，其断口呈准解理断裂，随着温度升高，此脆性逐渐消失。

Crack growth area mainly has the fatigue striation , with secondary cracks , torn edges , quasi-cleavage fracture .

裂纹扩展区主要为疲劳条带并存在明显的二次裂纹、撕裂棱、准解理面。

Results showed that pure molybdenum plate with the fibrous microstructures possessed a good quality of ductility , and its fracture behavior was quasi-cleavage fracture .

结果表明：纤维状组织的高纯钼板具有良好的室温韧性，其断裂表现为准解理断裂；

In preheated HAZ the rupture fracture is an overwhelming majority and a little hydrogen-embrittlement quasi-cleavage fracture can be found .

预热时绝大部分是等轴韧窝断口，但也有少量沿晶和氢致准解理断口。

The metal mold casting alloys exhibit mainly cleavage fracture , and the mixed solid-liquid casting and semi-solid casting consist of cleavage fracture and quasi-cleavage fracture .

金属型铸造合金拉伸断口为典型的解理断裂，而固液混合铸造及半固态铸造ZA12合金的拉伸断口呈现解理断裂与准解理断裂相结合的断裂特征。

The stress corrosion cracking sensitivity of the steel was low , and the fractography of its stress corrosion cracking showed transgranular and quasi-cleavage fracture with secondary cracks .

研究表明该钢具有较好的抗应力腐蚀性能，其应力腐蚀断裂形貌为穿晶、解理断裂，并有二次裂纹。

The SEM observation of the fracture surface reveals that the intergranular hydrogen-embrittlement quasi-cleavage fracture is an overwhelming majority in non-preheated HAZ ;

断口观察结果表明，不预热时绝大部分为结晶断口，且以氢致准解理断口为主；

It is shown that the fracture surface is flat and of radiating pattern with the microstructure being quasi-cleavage fracture , which indicates the fracture of the bolt is brittle .

断口分析结果表明，断口平坦，呈放射状花样，微观形态主要为准解理花样，表明螺栓的断裂是脆性断裂；

The scanning electron microscope test showed that the fracture of the flash butt welding joint was cleavage fracture and quasi-cleavage fracture . The flash butt welding joint has good plastic and impact toughness .

断口扫描显示闪光对焊接头拉伸和冲击试验断口为解理+准解理，以准解理为主，具有良好的塑性和冲击韧性。

The results showed that crack origins from the casting defect places , crack fracture surface represents cleavage fracture and quasi-cleavage fracture characteristic . The fracture mechanism is brittle fracture that it put on the crystal .

结果发现铸铝A356.0裂纹起源于铸造缺陷处，裂纹是穿晶扩展，断口为准解理型，其断裂机理为穿晶型脆性断裂。

SEM analysis on the fatigue crack propagation plan was performed , and the analysis results indicate that the fatigue crack propagates in the mode of quasi-cleavage fracture in the presplitting region and steady state growth region .

对疲劳裂纹扩展试样断口分析表明，在预裂区和疲劳裂纹稳态扩展区，裂纹以准解理方式扩展。

SEM analysis shows that the alloy containing 1 % Nd exhibits the maximum fatigue propagation regions . There exists rip edge and dimple in rupture of three different Nd content alloys , showing quasi-cleavage and toughness fracture .

疲劳断口SEM形貌分析表明，Nd含量为1.13%的合金具有最大的疲劳裂纹扩展区域，3种Nd含量的合金疲劳断口都存在撕裂棱和韧窝，表现为准解理和韧性断裂的混合特征。