锻压技术

含氮CoCrMo合金锻造工艺

英文标题：Forging process for N-containing CoCrMo alloy

作者：王雷顾怀章孙岳来邓军马步洋

分类号：TG319

出版年,卷(期):页码：2022,47(5):1-4

摘要：

通过热包覆保温方法，使用快锻机对含氮CoCrMo合金电渣锭进行了开坯锻造试验，研究了在1150 ℃始锻温度时该合金在热包覆保温情况下的可锻性。试验采用摔圆、拔长的锻造方法，对含氮CoCrMo合金圆棒坯料进行两端分段锻造。试验结果表明：含氮CoCrMo合金在1150 ℃热包覆保温2.5 h后采用分段锻造，获得的材料屈服强度为623.9 MPa、抗拉强度为933.9 MPa、伸长率为20.3%、硬度为27.5 HRC，各项力学性能均满足要求；合金中的氮化物提高了材料的性能及晶粒细化程度，锻造后锻料的晶粒度不大于5.5级，晶粒度满足要求。通过热包覆分段锻造方法，成功对含氮CoCrMo合金电渣锭进行了锻造。

Through the method of hot wrap and heat preservation, the blanking and forging test of N-containing CoCrMo alloy electroslag ingot was carried out by rapid forging machine, and the malleability of the alloy under the condition of hot wrap and heat preservation at the initial forging temperature of 1150 ℃ was studied. Then, the forging method of rounding and streching was adopted in the test, and the two ends of N-containing CoCrMo alloy bar blank were forged in sections. The test results show that the N-containing CoCrMo alloy is forged in sections after being hot wrapped at 1150 ℃ for 2.5 h, its yield strength is 623.9 MPa, tensile strength is 933.9 MPa, elongation is 20.3%, and hardness is 27.5 HRC, and all mechanical properties meet the requirements. The nitrides in the alloy is beneficial to improve the properties of material and the grain refinement degree. After forging, the grain size of N-containing CoCrMo alloy after forging is not greater than grade 5.5, and the grain size meets the requirements. Thus, the electroslag ingot of N-containing CoCrMo alloy is successfully forged by the method of hot wrap and sectional forging.

基金项目：

凯里学院博士启动项目（BS201814）；省教育厅自然科学研究项目（黔教合KY字［2020］069）；国家自然科学基金资助项目（31760191）

作者简介：王雷(1970-)，男，博士，副教授，E-mail：2015163582@qq.com

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