金属材料洛氏硬度试验能力验证分析

Analysis of Rockwell hardness proficiency testing for metal materials

为评价实验室对金属材料洛氏硬度的检测能力,开展了该项目的能力验证活动。首先将样品送至中国计量科学研究院进行检定,然后进行金相显微分析和不同位置的硬度测试,证明4等分切割不影响样品硬度值,且均匀性、稳定性良好。将硬度块均匀度的最大允许值作为比对值,采用差值法对实验室进行能力评定,这一方法对9家A标尺、10家B标尺和15家C标尺参评实验室的满意度分别为33.3%、50%和53.3%,远低于其他评价原则,证明采用这种评价原则可以找出实验室潜在的问题,帮助实验室提高检测能力。最后对本次能力验证结果进行具体的技术分析,确定硬度计和人员操作是影响试验结果的主要因素,为能力验证存在问题的实验室提供有效改进措施和依据。

In order to assess the laboratory's detection ability in Rockwell hardness of metal materials,a proficiency testing was conducted.Firstly,the samples were sent to the China Institute of Metrology for verification.Then,the metallographic microscopic analysis and hardness testing were conducted at different positions.It was proved that the quartering cutting did not affect the hardness value of the sample.Moreover,the uniformity and stability were good.The difference method was used for proficiency testing evaluation of the laboratory using the maximum allowable value of hardness block uniformity as the reference value.The satisfaction rates for 9 A-scale,10 B-scale,and 15 C-scale participating laboratories using this method were 33.3%,50%,and 53.3%,respectively,which were significantly lower compared to other evaluation principles.It demonstrated that employing this evaluation principle could identify the potential issues in the laboratory and assist in enhancing its testing capabilities.Finally,a detailed technical analysis was conducted on the results of this proficiency testing.It was concluded that the hardness tester and personnel operation were the primary factors that affected the experimental results.This analysis provided effective improvement measures and basis for laboratories with issues in proficiency testing.