Research on Stress Threshold of Stress Corrosion Cracking of Inconel 718 Alloy Hold-down Spring
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摘要: 采用适当的热处理时效工艺,可以避免板状压紧弹簧的Inconel 718镍基合金在晶界上产生有害的δ相,从而对压水堆一回路水质条件具有较低的应力腐蚀开裂敏感性。为防止镍基合金发生应力腐蚀开裂（SCC）,其承受的应力不应超过该合金屈服强度的75%~80%。对于采用Inconel 718材料的板状压紧弹簧,其设计应力阈值设为931 MPa（135 ksi）在合理范围内,且其数值并不保守。Abstract: The proper heat treatment should be adopted to avoid those that have harmful delta phase along the grain boundary of Inconel 718 alloy, so it will not sensitive to the stress corrosion cracking in primary water condition. And more, stress threshold should be kept below 75%~80% of yield strength to avoid the stress corrosion cracking at stress concentrators, such as fillets. The design threshold stress value of hold-down spring, 931MPa（135ksi） is appropriate, but not conservative.
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Key words:
- Stress corrosion cracking /
- Nickel-base alloy /
- Hold-down spring /
- Stress threshold
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