文摘
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研究了不同浇注温度下的K417G合金试样。结果表明,1 450 ℃浇注,合金中碳化物以块状为主,γ'相边缘钝化,γ'尺寸为1 μm左右;1 500 ℃浇注,合金中碳化物以长条形为主,γ'相边缘清晰,立方度较好,γ'尺寸为0.8 μm左右。1 450 ℃浇注的合金屈服强度及断裂强度均高于1 500 ℃浇注的合金。合金拉伸裂纹主要产生于碳化物处,1 450 ℃浇注的合金,碳化物尺寸较小,产生裂纹需要的应力较大;1 500 ℃浇注的合金,碳化物细长,碳化物断裂所需应力较小。在760 ℃/645 MPa条件下,1 450 ℃浇注的合金,平均持久寿命可达到219 h,而1 500 ℃浇注的合金,平均持久寿命仅为25 h。前者的断裂方式为穿晶断裂,后者为沿枝晶断裂,断口上存在有部分疏松组织。 |
其他语种文摘
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The K417G alloy samples at various pouring temperature were studied. The results show that the morphologies of phase were different at pouring temperature 1 450 ℃ and 1 500 ℃ in K417G alloy. The block carbide was observed in alloy pouring at 1 450℃, the edge of γ'phase has been blunted, the length of the γ'phase is 1 μm. And long strip carbide was shown in alloy poured at 1 500 ℃, γ'phase's edge was clear, cubic better, the length of the γ'phase is 0.8 μm. The yield strength and ultimate tensile strength of alloy poured at 1 450 ℃ are higher than the alloy poured at 1 500℃. The tensile cracks are generated in carbides, for the length of carbide shorter in alloy poured at 1 450 ℃, and carbides slender in alloy poured at 1 500 ℃, the fracture of carbides required bigger stress in alloy poured at 1450 ℃ than alloy poured at 1 500 ℃. The average stress rupture life was 219 h of alloy poured at 1450 ℃ at the condition of 760 ℃/645 MPa. But at the same conditions, the average stress rupture life was 25 h only of alloy poured at 1500 ℃. The fracture of alloy poured at 1450 ℃ is transgranular fracture,but fracture of alloy poured at 1500℃ is along the dendrite and found some microporosities on fracture surface. |
来源
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铸造
,2014,63(9):924-928 【核心库】
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关键词
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K417G合金
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浇注温度
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力学性能
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持久寿命
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地址
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1.
沈阳黎明航空发动机(集团)有限责任公司, 辽宁, 沈阳, 110043
2.
中国科学院金属研究所, 辽宁, 沈阳, 110016
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1001-4977 |
学科
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金属学与金属工艺 |
文献收藏号
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CSCD:5246209
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