论文部分内容阅读
研究了高真空冶炼32Si2MnCrMoV超高强钢的应力腐蚀滞后断裂性能。随着强度的提高,其抗应力腐蚀性能下降,这是由于强度增加、裂纹前沿三轴张应力增大,该微小区域易达到应力腐蚀开裂的临界氢原子浓度而造成脆化。在该钢的回火脆性区应力腐蚀界限强度因子K_(ISCC)同样降低。真空冶炼提高了该钢的纯净度,改善韧性和提高抗应力腐蚀性能。在等强度下与电渣钢相比,K_(ISCC)值可提高26％,应力腐蚀亚临界裂纹扩展速率降低60％。
The stress corrosion hysteresis fracture behavior of 32Si2MnCrMoV ultra-high strength steel was investigated. With the increase of the strength, the stress corrosion resistance decreases. This is due to the increase of the strength and the increase of the triaxial tensile stress at the front of the crack. The tiny region can easily reach the critical hydrogen atom concentration of stress corrosion cracking and cause embrittlement. In the steel temper brittleness zone stress corrosion limit strength factor K_ (ISCC) also reduced. Vacuum smelting improves the purity of the steel, improves toughness and improves stress corrosion resistance. Compared with electroslag steel, the value of K_ (ISCC) can be increased by 26% and the rate of stress corrosion subcritical crack propagation can be reduced by 60% under the same strength.