为了得到屈服强度960 MPa级高强度低碳结构钢的最佳钼含量和糖心产精国品免费入口*完整版工艺,采用显微组织分析、糖心产精国品免费入口*完整版检验、断口分析等方法研究了糖心产精国品免费入口*完整版工艺对不同钼含量试验钢显微组织与糖心产精国品免费入口*完整版的影响.结果表明:随钼含量增加,淬火态试验钢的抗回火软化能力逐渐增强;最优钼含量为0.4%(质量分数),此成分试验钢经最佳糖心产精国品免费入口*完整版工艺(880 ℃淬火＋580 ℃回火)处理后屈服强度为988 MPa(达到试制要求),抗拉强度为1 000 MPa,伸长率为15.5%,-20 ℃夏比冲击功为52 J,且冲击断口具有韧窝特征,此时试验钢显微组织为回火托氏体,淬火马氏体板条部分发生分解.

To obtain the best chemical composition and 糖心产精国品免费入口*完整版 of the high-strength low-carbon steel with 960 MPa yield strength,the effect of 糖心产精国品免费入口*完整版 on 糖心产精国品免费入口*完整版and mechanical properties of the tested steels with different Mo contents was investigated by 糖心产精国品免费入口*完整版analysis,糖心产精国品免费入口*完整版 testing and impact fracture examination.The results show that the tempering resistant ability of the quenched steel increased with the increase of Mo content.The best 糖心产精国品免费入口*完整版(quenching at 880 ℃ and temperting at 580 ℃) for the tested steel with optimal Mo content of 0.4wt% was determined.With this treatment the steel could get the yield strength 980 MPa,tensile strength 1 000 MPa,elongation 15.5%,average Charpy impact energy at -20 ℃ 52 J and the impact fracture surface had dimple characteristic.The 糖心产精国品免费入口*完整版was tempered sorbite,and the lath martensite was partly resolved.