標(biāo)準(zhǔn)編號:	GB/T 25744-2010
中文名稱:	鋼件滲碳淬火回火金相檢驗(yàn)
英文名稱:	Metallographic examination for carburizing quenching and tempering of steel parts
中標(biāo)分類:	J36    熱處理
行業(yè)分類:	GB    國家標(biāo)準(zhǔn)
ICS分類:	25.200 25.200    熱處理 25.200
發(fā)布機(jī)構(gòu):	國家質(zhì)量技術(shù)監(jiān)督局
發(fā)布日期:	2010-12-23
實(shí)施日期:	2011-6-1
標(biāo)準(zhǔn)狀態(tài):	valid
翻譯語言:	英文
文件格式:	PDF
中文字符數(shù):	21000 字
翻譯價(jià)格(元):	900.0
交付時(shí)間:	付款后 1 個(gè)工作日

1 Scope This standard specifies the metallographic structure examination for carburizing quenching and tempering of steel parts, metallographic structure grades, and determination methods for the effective depth of carburizing quenched and hardened cases. This standard is applicable to the workpiece with the effective depth of carburizing quenched and hardened cases greater than 0.3 mm. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies. GB/T 7232 Terminology of metal heat treatment GB/T 9450 Steels - Determination and verification of the depth of carburized and hardened cases (GB/T 9450-2005, ISO 2639: 2002, MOD) GB/T 13298 Inspection methods of microstructure for metals 3 Terms and definitions For the purposes of this standard, the terms and definitions given in GB/T 7232, as well as the following apply. 3.1 core structure the structure with a distance of 3 times the effective depth of the carburizing quenched and hardened cases from the surface 4 Specimen 4.1 The specimen shall be taken from the representative service area of the workpiece, or the furnace specimen corresponding size shall be taken. The surface roughness of the furnace specimen shall be the same as that of the workpiece.

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Specimen 5 Inspection items and methods 6 Evaluation of metallographic structure grades 7 Instruments for inspection 8 Inspection report Annex A (Informative) General provisions for metallographic examination for carburizing quenching and tempering of steel gears Annex B (Normative) Schematic diagrams for martensite grades Annex C (Normative) Schematic diagrams for retained austenite grades (500x) Annex D (Informative) Schematic diagrams for retained austenite grades (1,000×) Annex E (Normative) Schematic diagrams for carbide grades Annex F (Informative) Internal oxidation morphology Annex G (Normative) Schematic diagrams for core structure grades