电子探针面分析法测定钢的脱碳层深度

doi:10.13251/j.issn.0254-6051.2021.05.042

摘要/Abstract

摘要： 提出钢表层脱碳层深度测定的一种新方法,即电子探针面分析法。对热轧态高碳工具钢75Cr1、淬火齿轮钢20CrMnTi、冷轧退火低碳车厢板SH1100钢3个典型钢种完成脱碳层深度的测定试验,结果表明:对于珠光体-铁素体型中高碳钢的脱碳层深度测定,金相法测定值是电子探针面分析法测定值的77%左右;对于淬回火钢的脱碳层深度测定,电子探针面分析法的测量精度在10 μm以下,约是显微硬度法测量精度的十分之一;对于脱碳层深度不易准确测定的低碳钢,电子探针面分析法通过较大区域范围的平均碳含量变化曲线来测定脱碳层深度,测量结果准确。电子探针面分析法在脱碳层深度测定方面具有钢种组织状态不限、试样形状不限、数据统计性好、测量精度高、易操作等优势,可在业内大力推广。

关键词: 电子探针, 面分析法, 脱碳层深度, 钢

Abstract: EPMA mapping analysis method was proposed to determine the depth of decarburization of steels. The determination of the depth of decarburization was completed on three typical steels such as hot rolled 75Cr1 high carbon tool steel, 20CrMnTi quenched gear steel and cold rolled and annealed SH1100 low-carbon carriage plate steel respectively. The results show that for the medium and high carbon steel specimen with pearlite plus ferrite microstructures, the value of depth of decarburization provided by micrographic method is about 77% of that by EPMA mapping analysis method. For the determination of decarburization depth of quenched and tempered steels, the accuracy degree of EPMA mapping analysis is less than 10 μm, which is one tenth of the micro-hardness testing. For low carbon steels which are difficult to determine the depth of decarburization generally, the measurement values of EPMA mapping analysis are accurate considering that the depth of decarburization is determined based on the transition curve of average carbon content over a large zone of the steel specimen. EPMA mapping analysis method deserves to be applied extensively with apparent advantages such as unlimited steel microstructure, loose requirement for sample shape, good data stability, high accuracy and easy to operate, etc.

Key words: electron probe micro-analyzer (EPMA), mapping analysis method, depth of decarburization, steel

中图分类号:

TG142.1

严春莲, 鞠新华, 姚武刚, 贾惠平, 温娟. 电子探针面分析法测定钢的脱碳层深度[J]. 金属热处理, 2021, 46(5): 242-247.

Yan Chunlian, Ju Xinhua, Yao Wugang, Jia Huiping, Wen Juan. Determination of decarburization depth of steels by EPMA mapping analysis method[J]. Heat Treatment of Metals, 2021, 46(5): 242-247.

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