To Investigate the Effect of Heat Treatment on API X70 Pipeline Steel

IF 1.2 4区综合性期刊 Q3 MULTIDISCIPLINARY SCIENCES

National Academy Science Letters Pub Date : 2024-01-28 DOI:10.1007/s40009-023-01379-9

Nitesh Kumar, Lochan Sharma, Amman Jakhar

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Abstract

API pipeline steels are designed in such a way that they can survive in high temperatures and high pressure in different environments. The API X70 pipeline steel has a very fine-grained microstructure so it has high strength and ductility. In present work, the heat treatment of API X70 steel was performed at different tempering temperature and microstructural analysis was studied. Mechanical and microstructural behavior of base metal and heat-treated API X70 steel was studied. The distinct phases such as ferrite, pearlite and some carbides that form during the heat treatment are visible in the microstructure of the heat-treated samples, XRD as well as SEM analysis of base and heat-treated specimens were performed. Major peaks of iron were observed for both base and heat-treated samples during XRD analysis. XRD analysis of API X70 steel in which maximum peak intensity was present at an angle 2Ɵ = 40.18 and 44.6. SEM analysis of base as well as heat treated API X70 steel exhibit different phases such as Acicular, ferrite-pearlite and small inclusions of carbides. Various phases such as ferrite as well as pearlite were observed for the specimen tempered at 650 °C for 3 Hours. Base metal typically exhibits acicular ferrite microstructure. The microhardness of base metal (28.25 HRC) is higher as compared to the heat-treated steel (6.87 HRC).

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研究热处理对 API X70 管线钢的影响

API 管线钢的设计使其能够在高温高压的不同环境中生存。API X70 管线钢具有非常精细的微观结构，因此具有很高的强度和延展性。本研究在不同回火温度下对 API X70 钢进行了热处理，并对其微观结构进行了分析。研究了基本金属和热处理 API X70 钢的机械和微观结构行为。对母材和热处理试样进行了 XRD 和 SEM 分析，在热处理过程中形成的铁素体、波来石和一些碳化物等明显的相在热处理试样的微观结构中清晰可见。在 XRD 分析中，基本试样和热处理试样都观察到了铁的主要峰值。API X70 钢的 XRD 分析结果表明，在角度 2Ɵ = 40.18 和 44.6 处出现了最大的峰值强度。对基体和热处理后的 API X70 钢进行的扫描电镜分析显示出不同的相，如针状、铁素体-珠光体和小的碳化物夹杂物。在 650 °C 回火 3 小时的试样中观察到铁素体和珠光体等各种相。贱金属通常呈现针状铁素体微观结构。贱金属的显微硬度（28.25 HRC）高于热处理钢（6.87 HRC）。

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来源期刊

National Academy Science Letters 综合性期刊-综合性期刊

CiteScore

2.20

自引率

0.00%

发文量

审稿时长

12 months

期刊介绍： The National Academy Science Letters is published by the National Academy of Sciences, India, since 1978. The publication of this unique journal was started with a view to give quick and wide publicity to the innovations in all fields of science