Transactions of Materials and Heat Treatment

Title：Analysis on cracking failure cause of hot forging die for H13 steel

Authors： Chen Jianli Zhang Xiaokun

Unit： Shanxi Taigang Stainless Steel Co. Ltd.

KeyWords： H13 steel hot forging die crack steel purity microstructure tempering nitriding

ClassificationCode：TG142

year,vol(issue):pagenumber：2019,44(12):109-113

Abstract：

The nonmetallic inclusion, microstructure, chemical composition and micro-hardness at the crack of hot forging die were detected and analyzed by Leica optical microscope, 438VP/KEVEX scanning electron microscope/energy spectrometer and AMH43 automatic micro-hardness tester. At the same time, combined with the forging method of die, billet heating, forging temperature, cooling after forging, annealing and other hot working processes, and the quenching, tempering, surface nitriding and other heat treatment of die, as well as the working environment and using process of die, the cracking failure mechanism of the hot forging die was systematically analyzed.The results show that the hot forging die of H13 steel has high purity and uniform microstructure, and the cracking is not caused by the quality problems of raw materials. However, there is nitriding layer at the crack of hot forging die without decarburization, which indicates that the cracking occurs after quenching and before nitriding of the hot forging die, and after the hot forging die is quenched, the cracking occurs due to the large structural stress and residual stress caused by insufficient tempering or not tempering in time.

Funds：

陈建礼（1968-），男，学士，教授级高级工程师 E-mail：chenjl@tisco.com.cn

Reference：

［1］陈再枝，蓝德年.模具钢手册
［M］. 北京：冶金工业出版社，2002.

Chen Z Z, Lan D N. Die Steel Handbook
［M］. Beijing: Metallurgical Industry Press, 2002.

［2］罗伯茨G A，卡里R A.工具钢
［M］.徐进，姜先畲，译.北京：冶金工业出版社，1987.

Roberts G A，Cary R A. Tool Steels
［M］. Translated by Xu J, Jiang X S. Beijing: Metallurgical Industry Press, 1987.

［3］蔡美良，丁惠麟，孟沪龙. 新编工模具钢金相热处理
［M］. 北京：机械工业出版社，1998.

Cai M L, Ding H L, Meng H L. New Metallographic Heat Treatment of Tool and Die Steel
［M］. Beijing: China Machine Press,1998.

［4］GB/T 10561—2005，钢中非金属夹杂物含量的测定标准评级图显微检验方法
［S］.

GB/T 10561—2005，Steel—Determination of content of nonmetallic inclusions—Micrographic method using standerds diagrams
［S］.

［5］刘永铨.钢的热处理
［M］. 北京：冶金工业出版社，1987.

Liu Y S. Heat Treatment of Steel
［M］. Beijing: Metallurgical Industry Press, 1987.

［6］陈列，曹小军，左辉，等.锻造变形方式对叶片钢1Cr12Ni2Mo2VN横向冲击韧性的影响
［J］. 特殊钢，2015，36（2）：28-31.

Chen L，Cao X J，Zuo H，et al. Effect of forging method on horizontal impact toughness of blade steel 1Cr12Ni2Mo2VN
［J］. Special Steel, 2015，36(2):28-31.

［7］王家瑛，王志东.模具材料与使用寿命
［M］.北京：机械工业出版社，2000.

Wang J Y, Wang Z D. Mold Material and Service Life
［M］. Beijing: China Machine Press, 2000.

［8］徐进，姜先畲，陈再枝，等.模具钢
［M］. 北京：冶金工业出版社，2002.

Xu J, Jiang X S, Chen Z Z, et al. Die Steel
［M］. Beijing: Metallurgical Industry Press, 2002.

［9］王广生，石康才，周敬恩，等.金属热处理缺陷分析及案例
［M］. 北京：机械工业出版社，1997.

Wang G S, Shi K C, Zhou J E, et al. Analysis and Cases of Metal Heat Treatment
［M］. Beijing: China Machine Press,1997.

［10］陈灵，梁思祖，刘正义.4Cr13钢塑料模具开裂原因分析
［J］. 热加工工艺，2005，34(5)：50-57.

Chen L, Liang S Z，Liu Z Y. Fracture analysis on plastic die of 4Cr13 steel
［J］. Hot Working Technology,2005，34(5): 50-57.

［11］赵昌胜. 5CrMnMo型热作模具钢在热锻模具中的应用及热处理
［J］. 金属加工，2013,(1)：64-66.

Zhao C S. Application and heat treatment of 5CrNiMo hot work die steel in hot forging die
［J］.Metal Working，2013, (1): 64-66.

［12］史开阳. 提高热锻模使用寿命的方法探索
［J］. 液压气动与密封，2016,36(6)：53-56.

Shi K Y. An exploration on the way to increase the service life of hot forging die
［J］. Hydraulics Pneumatics & Seals, 2016,36(6):53-56.

［13］杨金华. 3Cr2W8V钢制尖嘴钳热锻模热处理工艺改进
［J］.电加工与模具，2006,(5)：60-62.

Yang J H. Improvement on heat treatment of 3Cr2W8V hot forging dies for the crosscut nip
［J］. Electronmachining & Mould, 2006,(5):60-62.

Service：

【This site has not yet opened Download Service】【Add Favorite】