Coarsening grain and intercrystalline network ferrite depress crack growth resistance of the materials strongly and result in unstable propagation of crack very easily.
晶粒粗大及晶间网状铁素体强烈降低材料的裂纹扩展阻力，并极易导致裂纹的失稳扩展。
2
The result showed that the direct reason of reboiler invalidation was the intercrystalline stress corrosion and crack caused by micro-chloride in the medium.
结果表明，介质中所含的微量氯离子引起的晶间型应力腐蚀开裂导致再沸器失效。
3
The Lower Paleozoic reservoir mainly by corrosion pore, intercrystalline pore and the crack are composed.