15CrMnMoV钢回火脆性研究

对15CrMnMoV钢空淬和油淬组织于180～660℃不同温度下回火的变化进行了研究，重点研究了高温回火时该钢中特殊碳化物的析出过程及其对回火脆性的影响。

多道次冷轧法制备内生复合钢板

通过将淬火后的１５ＣｒＭｎＭｏＶ 钢进行多道次冷轧的方法制备了金属内生复合板，透射电镜（ＴＥＭ）及Ｘ 射线（Ｘｒａｙ） 衍射研究发现：复合板显微组织呈现明显的层片状特征，试样的屈服强度σ０．２ 为１ ５００ ～１ ８００ＭＰａ，断裂韧性ＫＩＣ为８５ ～１１０ ＭＰａ ｍ１／２ ，ＫＩＳＣＣ为７５ ～９８ ＭＰａ ｍ１／２ 。

Secondary hardening behavior of 15CrMnMoV thin rolled tube

15CrMnMoV rolled tube is applied to many critical parts of helicopter. The secondary hardening behavior of the steel which varied with the treating process is essential for further usage. In this paper, the secondary hardening behavior of water quenched, oil quenched and air cooled steel are compared. The precipitations of alloy carbides are analyzed by electrolytic extraction, X-ray diffraction, optical microscopy as well as scanning electron microscopy. Results show that the secondary hardening effect in the air cooled steel is higher than in the water quenched and oil quenched steel, but the toughness decreases more seriously, due to more precipitation of Mo2C and VC.

冷轧组织对15CrMnMoV钢板断裂行为的影响

采用自制平面应力拉伸装置,通过扫描电镜,透射电子显微镜等分析测试方法对15CrMnMoV钢的淬火-回火组织和淬火-冷轧组织的断裂行为进行了研究。实验结果表明:具有冷轧组织试样的断裂阻力明显高于原始组织试样。利用复型的方法精确测定出裂纹长度,并计算得出能量释放率D-△a的关系曲线,轧制试样在△a=40μm时出现峰值,显微组织分析表明峰值产生的原因是弱界面开裂的结果。