Blade Attachment Slots: Hardness 30-50 HRC

Component Specifications

Definition

Blade attachment slots are precisely machined grooves or recesses on the periphery of a rotor disk in turbomachinery (such as gas turbines, steam turbines, or compressors). These slots are designed to securely hold and position turbine or compressor blades, transferring centrifugal and aerodynamic loads from the blades to the disk while maintaining precise alignment and allowing for thermal expansion. They are critical for rotor assembly integrity and aerodynamic performance.

Working Principle

The slots mechanically interlock with the blade roots (e.g., fir-tree, dovetail, or T-root designs) to transfer loads. During operation, centrifugal forces push the blade roots into the slot, creating a tight fit that distributes stress. The slot geometry ensures proper blade angle and spacing for optimal fluid dynamics, while allowing for differential thermal expansion between the disk and blades to prevent binding or excessive stress.

Materials

Typically forged or machined from high-strength, heat-resistant alloys such as nickel-based superalloys (e.g., Inconel 718, Waspaloy) or titanium alloys (e.g., Ti-6Al-4V), matching or complementing the rotor disk material. Surface treatments like shot peening or coatings may be applied to enhance fatigue resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	30-50 HRC
Slot Type	Fir-tree, Dovetail, T-slot, or Axial Entry
Tolerance	±0.025 mm to ±0.1 mm
Load Capacity	Designed for centrifugal loads up to 100-500 MPa
Surface Finish	Ra 0.8 μm to 3.2 μm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 12107, DIN EN 10204, ASME B46.1

Parent Products

This component is used in the following industrial products

Rotor Disk

A rotating disk that holds turbine blades and transmits mechanical energy in turbines and expanders.

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Engineering Analysis

Risks & Mitigation

Fatigue cracking due to cyclic loads
Wear or fretting at slot interfaces
Misalignment causing vibration or efficiency loss
Thermal stress-induced deformation

FMEA Triads

Trigger: High cyclic centrifugal and thermal stresses
Failure: Crack initiation and propagation in the slot, leading to disk failure
Mitigation: Use fatigue-resistant materials, optimize slot geometry with finite element analysis (FEA), apply surface treatments, and implement regular NDT inspections.

Trigger: Improper machining or tolerances
Failure: Blade looseness or excessive stress concentrations
Mitigation: Adhere to strict machining standards, use precision tooling, and conduct thorough quality control checks.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Meets ISO 2768-mK for general tolerances and specific design standards for slot geometry

Test Method

Dimensional verification via CMM, fatigue testing per ISO 12107, and NDT per ASME BPVC Section V

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Blade Attachment Slots

Manufacturer profiles associated with Blade Attachment Slots.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What are the common types of blade attachment slots?

Common types include fir-tree slots (for high-stress applications like gas turbines), dovetail slots (common in steam turbines and compressors), T-slots (for axial retention), and axial entry slots (for easier assembly). The choice depends on load, temperature, and assembly requirements.

How are blade attachment slots inspected for quality?

Inspection methods include coordinate measuring machines (CMM) for dimensional accuracy, non-destructive testing (NDT) like dye penetrant or ultrasonic testing for cracks, surface roughness measurement, and visual checks for wear or damage during maintenance.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Blade Attachment Slots