16Co14Ni10Cr2MoE钢制抽筒抓钩开裂失效分析

摘要

The primary reason for cracking failure of the 16Co14Ni10Cr2MoE steel extractor was analyzed from force status of the extractor on working,fracture morphology,microstructure and surface hardness.Results indicate the 16Co14Ni10Cr2MoE steel had super high strength,but low toughness led to network cracks on the surface during the repeated high-speed impact.Some cracks propagated through surface compressive stress layer resulted from shot peening and then extended to the deep part.Higher temperature tempering was suggested to solve this problem because of toughness improving by little sacrifice of strength.%从16Co14Ni10Cr2MoE钢制火炮抽筒抓钩在服役过程中的受力状况、裂纹形貌、显微组织、表面硬度等方面,分析了抽筒抓钩开裂的主要原因.结果表明:虽然16Co14Ni10Cr2MoE钢的强度极高,但在抽筒高速反复冲击的情况下,由于韧性不足,导致抽筒受力表面产生网状裂纹,该裂纹可穿过喷丸压应力层向材料心部扩展.提出对16Co14Ni10Cr2MoE钢制抽筒抓钩进行高温回火,适当降低强度提高其冲击韧性来防止开裂的改进措施.