锻压技术

42CrMoA风电法兰力学性能不合格原因分析

英文标题：Analysis on unqualified reasons for mechanical properties of wind power flange of 42CrMoA

作者：高东升李亚峰李富生康喜英郭鸿飞

分类号：TG142.1

出版年,卷(期):页码：2018,43(4):159-162

摘要：

针对材质为42CrMoA钢制风电法兰，通过化学成分分析、气体含量分析、拉伸试验、夏比冲击试验、金相分析、扫描电镜以及能谱分析，对其力学性能不合格原因进行研究。结果表明：试验中42CrMoA钢的化学成分及钢中气体含量符合标准要求；抗拉强度(693 MPa）和下屈服强度(463 MPa）均低于标准要求的抗拉强度(800~950 MPa）和下屈服强度(≥550 MPa）；-40 ℃夏比冲击试验结果中有两个值不合格，有一个值合格，且其平均值小于27 J。结合金相检验和扫面电镜及能谱分析结果，得出以下结论：材料在调质处理时加热温度不足，导致钢中出现长条状铁素体组织；材料本身成分不均匀，导致不同部位冲击功数值差别很大；此外，在冲击断口处发现100 μm以上的大型夹杂物，会对钢材性能产生进一步危害。

For the wind power flange of steel 42CrMoA, the unqualified reasons of its mechanical properties were analyzed by chemical composition analysis, gas content analysis, stretching test, Charpy impact test, metallographic examination and SEM-EDS analysis. The results show that the chemical composition and gas content of steel 42CrMoA meet the standard requirements, and the tensile strength (Rm=693 MPa) and the lower yield strength (ReL=463 MPa) are lower than the standard required Rm (800-950 MPa) and ReL (more than 550 MPa) respectively. Then, two values of the Charpy impact test at -40 ℃ are not qualified, meanwhile one value is qualified, furthermore the average value is less than 27 J. Considering the results of metallographic examination and SEM-EDS analysis, it is concluded that the insufficient heating temperature of material in the quenching and tempering treatment leads to the appearance of long strip ferrite in the steel, and the uniform chemical composition of material leads to a great difference in the Charpy absorbed energy in different parts. In addition, the large inclusions over 100 μm are found at the impact fracture, which causes further damage to the properties of steel.

基金项目：

高东升（1966-），男，工学学士，高级工程师；E-mail：gds6763@163.com；通讯作者：李亚峰（1990-），男，硕士，助理工程师；E-mail：170226547@qq.com

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