Effects of copper, nickel, and boron on mechanical properties of low-alloy steel weld metals deposited at high heat input

Journal Article · Mon Aug 01 00:00:00 EDT 1994 · Welding Journal (Miami); (United States)

OSTI ID:6890612

Kluken, A O ^[1]; Siewert, T A ^[2]; Smith, R ^[3]

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1. SINTEF, Trondheim (Norway). Div. of Metallurgy
2. National Inst. of Standards and Technology, Boulder, CO (United States). Materials Reliability Div.
3. ESAB Group, Hanover, PA (United States)

The authors studied the effects of copper, nickel and boron on the mechanical properties of low-alloy steel weld metals deposited at high heat input by the submerged arc process. The copper and nickel contents of the welds were systematically varied within the ranges of 0.03 to 0.89 wt-% Cu and 0.01 to 1.54 wt-% Ni. In addition, several of these copper and nickel combinations were duplicated with welds containing 36 to 44 ppm B. Tensile testing revealed yield strengths, R[sub p0.2], in the range from 462 to 546 MPa, and ultimate tensile strengths, R[sub m], from 638 to 869 MPa. The weld metal Charpy V-notch (CVN) data showed a 35 J transition temperature, ITT[sub 35j], ranging from [minus]28 to 55 C. Upon adding boron, patches of intergranular fracture were present on the CVN fracture surfaces. This was particularly true when boron was added at the higher copper and nickel levels. Qualitative metallographic examinations revealed the presence of extensive amounts of particles at the prior austenite grain boundaries in boron containing welds. Furthermore, adding boron at the higher copper and nickel levels promoted the formation of the MAC (martensite-austenite-carbide) microconstituent. Also nickel seemed to promote formation of MAC in reheated weld metal. At this high heat input (4.8 kJ/mm), additions of copper, nickel and boron did not improve the mechanical properties.

• OSTI ID: 6890612
• Journal Information: Welding Journal (Miami); (United States), Vol. 73:8; ISSN 0043-2296
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON
METALLURGICAL EFFECTS
COPPER
LOW ALLOY STEELS
SUBMERGED ARC WELDING
WELDED JOINTS
NICKEL
MECHANICAL PROPERTIES
EXPERIMENTAL DATA
ALLOYS
ARC WELDING
DATA
ELEMENTS
FABRICATION
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
JOINING
JOINTS
METALS
NUMERICAL DATA
SEMIMETALS
STEELS
TRANSITION ELEMENTS
WELDING
360103* - Metals & Alloys- Mechanical Properties
360101 - Metals & Alloys- Preparation & Fabrication