Strategic Optimization of Post Weld Heat Treatment for Dissimilar TIG Weldment of P22 and P91 Steels

Q3 Engineering

International Journal of Vehicle Structures and Systems Pub Date : 2023-04-03 DOI:10.4273/ijvss.15.1.26

B. Singh, A. Duppala, Parmod Kumar, Ravi Arora, S. Bahl

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引用次数: 0

Abstract

The Gas Tungsten Arc Welding (GTAW) between P22 (2.25Cr-1Mo) and P91 (9Cr-1Mo) steels are quite common in heavy vehicle structures like; railway locomotives and war (or combat) vehicles. After welding, high hardness values of the Heat-Affected Zones (HAZs) of these dissimilar weld joints are possibly obtained. The uneven hardness in HAZ comes from the austenite transformation to Martensite, because of highly uncontrolled cooling rates. The considerable difference in hardness among various zones leads to prior cracking and is bound to failure during high-temperature operations. Therefore, there is a dire need to establish an appropriate Post Weld Heat Treatment (PWHT) to temper the dissimilar weld joints for required durability. The study investigates the microstructure and mechanical properties of various erupted zones of steel, before and after the application of PWHT. Before and after PWHT, weld zone and HAZ in P22 and P91 are mechanically tested and metallurgically examined. Further PWHT is tried to be optimised strategically and statistically, for the least variation in hardness among different zones. So that any failure due to thermal stresses or strains, during normal running conditions can be avoided.

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P22和P91钢异种TIG焊件焊后热处理策略优化

P22 (2.25Cr-1Mo)和P91 (9Cr-1Mo)钢之间的气体钨极电弧焊(GTAW)在重型车辆结构中很常见，如;铁路机车和战争(或作战)车辆。焊接后，这些不同焊接接头的热影响区(haz)有可能获得很高的硬度值。热影响区硬度的不均匀是由奥氏体向马氏体转变引起的，这是由于冷却速率的高度不可控造成的。各个区域之间的硬度差异很大，导致预先开裂，并注定在高温操作中失效。因此，迫切需要建立适当的焊后热处理(PWHT)来调节不同的焊接接头所需的耐久性。研究了应用PWHT前后不同喷发区钢的显微组织和力学性能。在PWHT前后，对P22和P91的焊接区和热影响区进行了机械测试和冶金检测。进一步尝试优化PWHT策略和统计，以使不同层间的硬度变化最小。因此，在正常运行条件下，任何由于热应力或应变引起的故障都可以避免。

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来源期刊

International Journal of Vehicle Structures and Systems Engineering-Mechanical Engineering

CiteScore

0.90

自引率

0.00%

发文量

期刊介绍： The International Journal of Vehicle Structures and Systems (IJVSS) is a quarterly journal and is published by MechAero Foundation for Technical Research and Education Excellence (MAFTREE), based in Chennai, India. MAFTREE is engaged in promoting the advancement of technical research and education in the field of mechanical, aerospace, automotive and its related branches of engineering, science, and technology. IJVSS disseminates high quality original research and review papers, case studies, technical notes and book reviews. All published papers in this journal will have undergone rigorous peer review. IJVSS was founded in 2009. IJVSS is available in Print (ISSN 0975-3060) and Online (ISSN 0975-3540) versions. The prime focus of the IJVSS is given to the subjects of modelling, analysis, design, simulation, optimization and testing of structures and systems of the following: 1. Automotive vehicle including scooter, auto, car, motor sport and racing vehicles, 2. Truck, trailer and heavy vehicles for road transport, 3. Rail, bus, tram, emerging transit and hybrid vehicle, 4. Terrain vehicle, armoured vehicle, construction vehicle and Unmanned Ground Vehicle, 5. Aircraft, launch vehicle, missile, airship, spacecraft, space exploration vehicle, 6. Unmanned Aerial Vehicle, Micro Aerial Vehicle, 7. Marine vehicle, ship and yachts and under water vehicles.