| 浅冷处理对H13钢组织与冲击韧性、硬度的影响 |
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| 引用本文： | 张世忠,王大伟,田鑫.浅冷处理对H13钢组织与冲击韧性、硬度的影响[J].包头职业技术学院学报,2021(1):3-4,24. |
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| 作者姓名： | 张世忠 王大伟 田鑫 |
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| 作者单位： | 包头职业技术学院金属材料及热处理技术教研室;上海朋泰机械科技有限公司金属材料及热处理技术生产部;上海三一重机股份有限公司 |
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| 基金项目： | 包头职业技术学院院级科研项目“H13热挤压模渗碳层早期失效分析及工艺改进”(KJ201807)成果。 |
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| 摘 要： | 在-86℃条件下,在淬火与回火工艺之间,对H13钢进行浅冷处理,处理时间分别为4h、6h、8h、10h,经洛氏硬度、冲击韧性性能测试,并使用奥利巴斯(OLYMPUS)光学显微镜观察其微观组织结构和表面形貌。微观分析表明,随浅冷处理工艺时间的延长,残余奥氏体量减少,马氏体体量增多;碎化的板条马氏体+弥散分布的碳化物是导致回火态试验钢冲击韧性提高、洛氏硬度不降低的原因。测试结果显示,试样的冲击韧性随浅冷时间延长而增大,最大增幅达到16.3%;浅冷处理之后的试样回火后硬度不降低,甚至出现高于淬火硬度的情况。
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| 关 键 词： | 浅冷处理 洛氏硬度 微观组织 冲击韧性 |
Effect of Shallow Cryogenic Treatment on Micro-structure,Impact Toughness and Hardness of H13 Steel |
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| Zhang Shizhong,Wang Dawei,Tian Xin.Effect of Shallow Cryogenic Treatment on Micro-structure,Impact Toughness and Hardness of H13 Steel[J].Journal of Baotou Vocational & Technical College,2021(1):3-4,24. |
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| Authors: | Zhang Shizhong Wang Dawei Tian Xin |
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| Institution: | (Material Engineering Department,Baotou Vocational & Technical College,Baotou,Inner Mongolia 014035;Production of Metal Materials and Heat Treatment Technology,Shanghai Pengtai Machinery Technology Co.,Ltd.,Shanghai 201499;Shanghai SANY Heavy Machinery Co.,Ltd.,Shanghai 201499) |
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| Abstract: | At-86°C,between quenching and tempering,H13 steel was lightly cooled for 4h,6h,8h and 10h respectively,the micro-structure and phase composition were analyzed by Olympus optical microscope.The microcosmic analysis shows that the retained austenite decreases and the martensite increases with the extension of the shallow cooling treatment time.The fractured Lath martensite and dispersed carbides are the main reasons for the increase of impact toughness and the non-decrease of Rockwell hardness of the tempered steel.The results show that the impact toughness of the specimens increases with the increase of shallow cooling time,and the maximum increase is 16.3%.The hardness after tempering does not decrease or even appear higher than the quenching hardness. |
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| Keywords: | shallow cryogenic treatment Rockwell hardness microstructure impact toughness |
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