scholarly journals A round-robin test with thermal simulation of the welding HAZ to draw CCT diagrams: a need for harmonized procedures and microconstituent terminologies

2014 ◽  
Vol 19 (3) ◽  
pp. 279-290 ◽  
Author(s):  
Américo Scotti ◽  
Huijun Li ◽  
Rosa M. Miranda
Keyword(s):  
Heat Affected Zone ◽  
Hsla Steel ◽  
High Strength ◽  
Round Robin ◽  
Round Robin Test ◽  
Measurement Systems ◽  
Thermal Simulations ◽  
Simulation Parameters ◽  
Cct Diagrams

Thermal simulations of heat affected zone (HAZ) have been widely used. This is an economic expedite process for phase transformation evaluations in steels when subjected to weld thermal cycles as well as to draw continuous cooling transformation (CCT) diagrams. Different approaches for the simulation and parameter settings have been used by several researchers, yet leading to not always even results. Thus, it was proposed a round-robin test trial performed by different laboratories, aiming to evidence potential sources of error or inadequacy of the approaches. A High Strength Low Alloy (HSLA) steel was used as a case study. Despite the limited number of tests, the results show low robustness when comparing the outcomes from the different laboratories and point out for the need to take three actions. The first one is to implement a cooperative and multi-institutional program to assess the effect of relevant simulation parameters, such as the heating rate and holding time at peak temperature, on the final microstructure and transformation temperatures as well as on the hardness for a given cooling rate. The second is to propose calibration procedures for the simulation and measurement systems. The third action is to stimulate experts in this area to develop a guideline of terminology for constituents in the heat affected zone of ferritic steels.

scholarly journals The Effect of Ca Content on the Formation Behavior of Inclusions in the Heat Affected Zone of Thick High-Strength Low-Alloy Steel Plates after Large Heat Input Weldings

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1328 ◽  
Author(s):  
Yinhui Zhang ◽  
Jian Yang ◽  
Longyun Xu ◽  
Yunlong Qiu ◽  
Guoguang Cheng ◽  
...  
Keyword(s):  
Heat Affected Zone ◽  
Heat Input ◽  
Hsla Steel ◽  
Solidus Temperature ◽  
High Strength ◽  
Steel Plates ◽  
Ca Addition ◽  
Formation Behavior ◽  
Large Heat ◽  
Molten Liquid

Ca deoxidation has been acknowledged recently as an effective oxide metallurgy technology that improves the toughness of the heat affected zone (HAZ) in high-strength low-alloy (HSLA) steel plates after large heat input welding. This paper describes the effect of Ca concentrations on the formation behavior of the non-metallic inclusions in the HAZs of a series of thick HSLA steel plates after large heat input welding at 400 kJ cm−1. The quantitative statistics on the inclusions show that the Ca addition significantly decreases the quantity of the pure MnS sulfide, but increases that of the complex oxysulfide. The pure MnS sulfide precipitates below the solidus temperature, while the complex oxysulfide forms in the molten liquid, leading to the core (oxide) and shell (sulfide) structure. The Ca addition proportionally improves the HAZ toughness of these thick HSLA steel plates, primarily owing to the positive effect of the complex oxysulfides on the refinement of the HAZ microstructure.

scholarly journals Weldability of Underwater Wet-Welded HSLA Steel: Effects of Electrode Hydrophobic Coatings

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1364
Author(s):  
Jacek Tomków
Keyword(s):  
Heat Affected Zone ◽  
Welded Joints ◽  
Hsla Steel ◽  
High Strength ◽  
Filler Material ◽  
Visual Test ◽  
Hydrophobic Coatings ◽  
Hydrophobic Substances

The paper presents the effects of waterproof coatings use to cover electrodes on the weldability of high-strength, low-alloy (HSLA) steel in water. With the aim of improving the weldability of S460N HSLA steel in water, modifications of welding filler material were chosen. The surfaces of electrodes were covered by different hydrophobic substances. The aim of the controlled thermal severity (CTS) test was to check the influence of these substances on the HSLA steel weldability in the wet welding conditions. The visual test, metallographic tests, and hardness Vickers HV10 measurements were performed during investigations. The results proved that hydrophobic coatings can reduce the hardness of welded joints in the heat-affected zone by 40–50 HV10. Additionally, the number of cold cracks can be significantly reduced by application of waterproof coatings on the filler material. The obtained results showed that electrode hydrophobic coatings can be used to improve the weldability of HSLA steel in underwater conditions.

Nucleation of Intragranular Acicular Ferrite in the Heat Affected Zone of Ti-Bearing Hsla Steel

2010 ◽  
Vol 168-170 ◽  
pp. 837-841
Author(s):  
Li Qing Zhang ◽  
Kai Ming Wu
Keyword(s):  
Heat Affected Zone ◽  
Acicular Ferrite ◽  
Hsla Steel ◽  
High Strength ◽  
Complex Oxides ◽  
Low Alloy Steel ◽  
X Ray ◽  
Nucleation Sites ◽  
Intragranular Acicular Ferrite ◽  
Ferrite Nucleation

The nucleation of intragranular acicular ferrite in the welding heat-affected zone of Ti-bearing high strength low alloy steel was investigated by means of electron microscopy. It was found that intragranular acicular ferrite nucleation sites under different welding heat inputs (4.3kJ/mm and 10.0kJ/mm) are titanium complex oxides on which manganese (Mn) sulfides are precipitated. The complex compound is a Si and Mn-enriched oxide. Analysis of the oxide by means of enenrgy dispersive X-ray spectrum indicated that the oxide has higher absorption ability of Si than that of Mn.

scholarly journals Temper Bead Welding of S460N Steel in Wet Welding Conditions

2018 ◽  
Vol 18 (3) ◽  
pp. 5-14 ◽  
Author(s):  
J. Tomków ◽  
D. Fydrych ◽  
G. Rogalski ◽  
J. Łabanowski
Keyword(s):  
Heat Affected Zone ◽  
Hsla Steel ◽  
Water Environment ◽  
High Strength ◽  
Offshore Structures ◽  
Cold Cracking ◽  
Common Method ◽  
Maximum Hardness ◽  
High Susceptibility ◽  
Welding Condition

AbstractWet welding is the most common method of welding in water environment. It is most often used for repairing of underwater parts of offshore structures. However, the water as a welding environment causes an increase of susceptibility of steels to cold cracking. For underwater constructions high strength low alloy (HSLA) steel are widely used. In wet welding condition a HSLA steel is characterized by high susceptibility to cold cracking. Temper Bead Welding (TBW) was chosen as a method to improve the weldability of S460N steel. The studies showed that TBW technique causes significant decrease of maximum hardness of heat affected zone (HAZ). The largest decrease in hardness occurred in specimens with the pitches in range 66-100%.

Analysis of Microstructure and Micro Mechanical Properties for Weld Joints of 1000MPa Class Steel by Nanoindentation Technique

2012 ◽  
Vol 217-219 ◽  
pp. 1987-1993 ◽  
Author(s):  
Xing Na Peng ◽  
Yun Peng ◽  
Jin Shan Wei ◽  
Zhi Ling Tian
Keyword(s):  
Elastic Modulus ◽  
Heat Affected Zone ◽  
Hsla Steel ◽  
Lath Martensite ◽  
High Strength ◽  
Coarse Grained ◽  
Fine Grained ◽  
Weld Joints ◽  
Microstructure Observation ◽  
Nanoindentation Technique

Nanoindentation technique was employed to examine the nanohardness and elastic modulus of weld joints of 1000MPa Class high strength low alloy (HSLA) steel. The distribution of micro scales mechanical behavior was analyzed combined with microstructure observation by OM, SEM and TEM. It was shown that weld metal and base metal were mainly of bainite and their nanohardness is about 4.0GPa. In the heat affected zone, fine grained heat affected zone and coarse grained heat affected zone with lath martensite structure had the maximum hardness (above 4.75GPa). From inter critical region, the hardness of HAZ decreased to 2.5 GPa. However, the elastic modulus of metallic material is not much sensitive to the microstructure.

Density Determination of Sintered Steel – Results of a Round Robin Test

2019 ◽  
Vol 56 (11) ◽  
pp. 731-746
Author(s):  
R. Peters ◽  
P. Beiss ◽  
S. Lindlohr
Keyword(s):  
Round Robin ◽  
Sintered Steel ◽  
Round Robin Test ◽  
Density Determination

DOMEX 550MC

Alloy Digest ◽  
2009 ◽  
Vol 58 (3) ◽  
Keyword(s):  
Physical Properties ◽  
Hsla Steel ◽  
Steel Structures ◽  
High Strength ◽  
Heat Treating ◽  
Bend Strength ◽  
Cold Forming ◽  
Wide Range ◽  
Hot Rolled ◽  
Earthmoving Machines

Abstract Domex 550MC is a hot-rolled, high-strength low-alloy (HSLA) steel for cold forming operations. It is available in thicknesses of 2.00-12.80 mm. The alloy meets or exceeds the requirements of S550MC in EN 10149-2. Applications include a wide range of fabricated components and steel structures, including truck chassis, crane booms, and earthmoving machines. This datasheet provides information on composition, physical properties, tensile properties, and bend strength as well as fatigue. It also includes information on forming, heat treating, and joining. Filing Code: SA-594. Producer or source: SSAB Swedish Steel Inc.

Sign in / Sign up

Export Citation Format

Share Document